Are you searching for effective ways to boost your website’s ad revenue? If so, in-stream advertising might be the game-changer you’re looking for. As video content continues to dominate online engagement, integrating ads within videos has become one of the most powerful monetization strategies for publishers. In-stream ads allow you to earn revenue while keeping your audience engaged with seamless, non-intrusive ad experiences.
In-stream advertising works by placing ads before, during, or after video content, making them a natural part of the viewer’s experience. Whether it’s a pre-roll ad that captures attention before a video begins or a mid-roll ad that appears at a strategic point, these formats are highly effective in reaching targeted audiences.
In this comprehensive guide, we’ll break down everything you need to know about in-stream advertising—how it works, why it’s so effective, and which networks are leading the way in 2026. Whether you’re a content creator, blogger, or digital publisher, this guide will help you understand how to leverage in-stream ads to maximize your video monetization potential.
What Is In-Stream Advertising?
In-stream advertising is a video advertising format in which an advertisement plays within video content, usually before, during, or after the main video.
The three common placements are:
- Pre-roll: The advertisement plays before the content.
- Mid-roll: The advertisement plays during the content.
- Post-roll: The advertisement plays after the content.
In-stream advertising can also include:
- Skippable video ads
- Non-skippable video ads
- Bumper ads
- Connected TV ads
- Mobile in-app video ads
- Interactive video ads
- Shoppable video ads
- Programmatic video ads
The format is attractive to advertisers because it combines moving images, audio, storytelling, targeting, and measurable engagement. Unlike a standard display banner, an in-stream ad appears in an environment where the user is already consuming video content.
How Does In-Stream Advertising Work?
At a high level, an in-stream advertising transaction involves several components:
Advertiser → Ad platform/DSP → Ad exchange/SSP → Publisher/video platform → Video player → Viewer
The advertiser creates a video creative and defines campaign parameters such as:
- Target audience
- Geography
- Device
- Budget
- Frequency
- Campaign objective
- Bid
- Placement
- Context
- Schedule
The buying platform then attempts to match that campaign with appropriate video inventory. When a user starts a video, the video player can request an advertisement. Technical standards such as VAST help communicate information about the ad between the ad server and video player. IAB Tech Lab describes VAST as an XML-based standard that transfers ad metadata from an ad server to a video player.
This is why an advertiser may interact with several different technologies during a single campaign. The company selling the traffic does not necessarily control the video player, ad server, exchange, measurement system, and publisher inventory.
In-Stream vs. Outstream Advertising
| Feature | In-Stream | Outstream |
|---|---|---|
| Plays inside video content | Yes | Usually no |
| Pre-roll | Yes | No |
| Mid-roll | Yes | No |
| Post-roll | Yes | No |
| Requires existing video content | Usually | No |
| Audio availability | Usually possible | Often muted initially |
| Common environments | Video players, CTV, apps | Articles, feeds, content pages |
| Main strength | Video engagement | Additional video reach |
| Typical objectives | Awareness, consideration, conversions | Reach, awareness, discovery |
Which is better?
Neither format is automatically better. If your audience is already watching video, in-stream can be highly relevant.
If you want to expand video reach beyond traditional video content, outstream can complement an in-stream strategy.
Why Should Advertisers Use In-Stream Ads?
In-stream advertising offers several advantages.
1. Strong Visual Communication
Video allows advertisers to demonstrate a product instead of simply describing it.
This is particularly useful for:
- Software
- Mobile apps
- Ecommerce products
- Financial products
- Education
- Travel
- Entertainment
- Consumer electronics
2. Storytelling
A 15-, 30-, or 60-second creative gives advertisers substantially more room to communicate a value proposition than a static banner.
3. Audience Targeting
Modern video platforms can support targeting based on combinations of:
- Geography
- Device
- Demographics
- Interests
- Context
- Audience segments
- Behavioral signals
- Content categories
4. Brand Awareness
Video is particularly useful when the advertiser needs to establish a brand rather than generate an immediate click.
5. Measurability
Advertisers can evaluate:
- Impressions
- Video starts
- Completion rate
- View-through rate
- Click-through rate
- Cost per completed view
- Conversions
- CPA
- Frequency
How We Evaluated These 10 Platforms
Advertiser Review evaluates each entry using five major factors:
Advertiser usefulness
Can the technology or platform actually help an advertiser reach a video audience?
Video capabilities
Does it support in-stream video, video serving, CTV, mobile video, or related infrastructure?
Targeting and buying
How useful is the platform for controlling where and to whom ads are delivered?
Current 2026 relevance
Is the platform still independently operating, or has it been acquired, renamed, discontinued, or repositioned?
Technical importance
Some entries are included because they are foundational technologies rather than traffic networks.
This distinction is important because calling every item a conventional “ad network” would create a misleading comparison.
Best In-Stream Ad Networks and Platforms Compared
| Rank | Platform / Technology | Category | Best For | 2026 Status | Advertiser Value |
| 1 | Google AdSense for Video | Video monetization | Historical Google video inventory | Discontinued | ★★★ |
| 2 | SpotX | CTV/video ad tech | Programmatic video & CTV | Integrated into Magnite | ★★★★ |
| 3 | BrightRoll | Video advertising | Historical programmatic video | Legacy | ★★★ |
| 4 | VAST | Ad-serving standard | Video ad delivery | Active standard | ★★★★★ |
| 5 | AdColony | Mobile video advertising | Mobile/app campaigns | Acquired/integrated | ★★★★ |
| 6 | Innovid | CTV/ad tech | Video delivery & measurement | Active under Mediaocean | ★★★★★ |
| 7 | Video.js | Video player | Custom video environments | Active | ★★★★ |
| 8 | Tremor Video | Video advertising | CTV & in-stream | Evolved within Nexxen ecosystem | ★★★★★ |
| 9 | Adzerk | Ad-serving infrastructure | Custom advertising platforms | Rebranded as Kevel | ★★★★ |
| 10 | Ooyala | Video technology | Historical OTT/video infrastructure | Acquired assets | ★★★ |
Best In-Stream Ad Networks of 2026
Here is a curated list of the top in-stream ad networks you can join in 2026:
- Google AdSense for Video
- SpotX
- BrightRoll (Verizon Media)
- VAST (Video Ad Serving Template)
- AdColony
- Innovid
- Video.js
- Tremor Video (Tremor International)
- Adzerk
- Ooyala
1. Google AdSense for Video
Historically one of Google’s important video monetization products, but it is no longer a viable standalone option in 2026 because Google discontinued the legacy AdSense for Video service on May 31, 2026.
Company Overview
Google AdSense for Video, commonly abbreviated as AFV, was designed to help publishers monetize web and native-app video content through Google’s advertising infrastructure.
Google’s documentation states that the legacy AdSense for Video service was fully discontinued on May 31, 2026 and that properties using the legacy product no longer serve ads or generate revenue through it.
The product used Google’s Interactive Media Ads (IMA) SDK technology to request and display video advertisements.
Advertiser demand → Google advertising systems → video ad request → IMA SDK → video player → viewer
Best For
Historically:
- Video publishers
- Native app publishers
- Web video publishers
- Developers using supported video players
For advertisers in 2026, the legacy product should not be selected as a new media-buying destination.
Key Features
- Video advertising
- Web video monetization
- Mobile video monetization
- IMA SDK integration
- Video ad serving
Pros
- Strong Google ecosystem
- Established video advertising infrastructure
- Large historical publisher ecosystem
- Integration with Google’s video advertising technology
Cons
- Discontinued in 2026
- Not appropriate for new campaigns
- No current standalone advertiser buying interface
- Historical information can easily be confused with current availability
Why Choose It?
There is no reason for a new advertiser to choose legacy AdSense for Video in 2026. Its value today is primarily historical and educational.
Who Should Avoid It?
Every advertiser looking for a currently operational video buying platform should avoid treating legacy AdSense for Video as an active network.
Expert Review
Google’s discontinuation is a good example of why advertisers should check the current status of an ad network before allocating budget.
Final Rating: 3.5/5
2. SpotX
SpotX was a major programmatic video and CTV advertising platform, but it is no longer an independent company because Magnite completed its acquisition in 2021.
Company Overview
SpotX became one of the most recognizable names in programmatic video advertising. Its importance grew alongside the transition from traditional television toward digital video and connected TV. Magnite announced the completion of its acquisition of SpotX on April 30, 2021, describing the combination as creating a major independent CTV and video advertising platform.
Best For
Historically:
- CTV advertisers
- Video advertisers
- Programmatic campaigns
- Publishers monetizing video inventory
- Agencies buying premium video
Key Features
- Programmatic video
- CTV
- Video inventory
- Publisher monetization
- Audience targeting
- Automated advertising transactions
- Premium video inventory
Pros
- Major historical video platform
- Strong CTV position
- Programmatic infrastructure
- Large publisher relationships
- Important role in the evolution of video advertising
Cons
- No longer an independent SpotX platform
- Current advertisers should evaluate Magnite rather than searching for a standalone SpotX network
- Not comparable with self-service performance networks
Why Choose It?
SpotX remains relevant when researching the history of programmatic video and CTV. For current campaigns, advertisers should investigate the Magnite ecosystem rather than treating SpotX as an independent network.
Expert Review
SpotX demonstrates one of the biggest changes in digital advertising: consolidation. Independent video platforms have increasingly become part of larger programmatic ecosystems.
Final Rating: 4.2/5
3. BrightRoll (Verizon Media)
BrightRoll was an influential programmatic video advertising platform, but the BrightRoll brand is now a legacy name rather than a standalone 2026 advertising network.
Company Overview
BrightRoll was founded as a video advertising platform and became one of the better-known names in programmatic video.
Yahoo acquired BrightRoll in 2014. The business later became part of Yahoo/Oath/Verizon Media’s broader advertising technology ecosystem.
This sequence is important:
BrightRoll → Yahoo → Oath → Verizon Media → later corporate restructuring
As a result, an advertiser searching for a standalone BrightRoll network in 2026 should not expect the same platform that existed during BrightRoll’s peak.
Best For
- Programmatic video
- Brand campaigns
- Video publishers
- Audience targeting
- Large-scale digital video
Key Features
- Video advertising
- Programmatic buying
- Audience targeting
- Video inventory
- Automated media buying
Pros
- Major influence on programmatic video
- Large historical inventory
- Strong acquisition by Yahoo
- Important technology foundation
Cons
- Legacy brand
- Not a standalone modern network
- Current platform availability differs significantly from historical BrightRoll
Why Choose It?
You should not choose BrightRoll as if it were a newly launched independent network. Its inclusion in this list is useful because many older “best video ad network” articles still mention it.
Expert Review
This is exactly the type of entry advertisers should verify before launching a campaign. A company name can remain visible in search results long after its independent product has disappeared.
Final Rating: 3.8/5
4. VAST (Video Ad Serving Template)
VAST is not an ad network. It is one of the most important technical standards behind digital video advertising.
Company Overview
The IAB Tech Lab developed VAST as a standard for structuring video ad responses and enabling communication between ad servers and video players. VAST uses XML to provide advertising information such as media files, tracking events, and other instructions needed for video ad delivery. The first version of VAST was introduced in 2008, and the standard has continued to evolve with the digital video advertising ecosystem.
Best For
- Video publishers
- Advertisers running in-stream campaigns
- Ad-tech companies
- Video platform developers
- OTT and CTV platforms
- Mobile app publishers
- Developers integrating video ads
Key Features
- Ad metadata
- Video ad delivery
- Tracking events
- Media files
- Video-player interoperability
Pros
- Industry standard
- Widely adopted
- Helps systems communicate
- Supports video measurement events
- Important for programmatic video
Cons
- Not a traffic source
- Not an ad network
- Requires technical implementation
- Advertisers cannot simply “buy traffic from VAST”
Why Choose It?
Developers and ad-tech teams choose VAST compatibility, not VAST traffic. For advertisers, VAST matters because compatibility can affect whether a video creative can be properly delivered and measured.
Expert Review
Calling VAST an “ad network” is technically incorrect. However, omitting VAST from a comprehensive article about in-stream advertising would also miss an important part of the technology stack.
Final Rating: 5/5 for technical relevance
5. AdColony
AdColony became a major mobile advertising platform known for video and rich-media advertising, but its ownership and product structure have changed significantly.
Company Overview
AdColony became particularly well known for mobile advertising and video technology. Digital Turbine announced its agreement to acquire AdColony in February 2021. At the time, Digital Turbine described AdColony as a mobile advertising platform serving advertisers and publishers with more than 1.5 billion monthly global users.
Digital Turbine completed the acquisition in April 2021. AdColony’s historical strength was mobile advertising, especially rich media and video.
Best For
- Mobile app advertisers
- Mobile games
- User acquisition
- Video advertising
- Rich media campaigns
Key Features
- Mobile advertising
- Video formats
- Rich media
- Audience targeting
- App inventory
- Performance advertising
Pros
- Strong mobile focus
- Significant historical reach
- Video expertise
- App-focused inventory
- Well-known in mobile advertising
Cons
- Ownership and product structure have changed
- Not the same independent AdColony platform that advertisers used historically
- Availability must be verified before campaign planning
Why Choose It?
AdColony’s historical strength makes it relevant for advertisers researching mobile video advertising. For current campaigns, advertisers should verify which AdColony assets and products are currently available through the present owner or successor platform.
Expert Review
AdColony illustrates another important lesson: An acquisition does not necessarily mean the technology disappears; it often means the brand, product, or distribution model changes.
Final Rating: 4.1/5
6. Innovid
Innovid is one of the most technically relevant names on this list for modern CTV, video advertising, creative delivery, measurement, and optimization.
Company Overview
Innovid developed from a video advertising technology company into a broader advertising infrastructure and measurement platform.
Mediaocean completed its acquisition of Innovid in February 2025. The combined organization brought Innovid and Flashtalking together under Mediaocean.
Mediaocean subsequently announced Innovid as the unified brand for its global ad-tech business, covering creative, delivery, measurement, and optimization.
Best For
- CTV advertising
- Video advertising
- Creative optimization
- Ad serving
- Measurement
- Attribution
- Omnichannel campaigns
Key Features
- Ad serving
- Creative personalization
- Video advertising
- CTV
- Measurement
- Campaign optimization
- Cross-channel analytics
Pros
- Strong CTV capabilities
- Advanced measurement
- Creative technology
- Omnichannel functionality
- Strong enterprise positioning
- Independent-ad-tech positioning
Cons
- More enterprise-oriented
- May be excessive for very small advertisers
- Not a simple low-budget traffic network
- Requires greater advertising sophistication
Why Choose It?
Choose Innovid when you care about control, measurement, creative delivery, and CTV infrastructure, rather than simply purchasing inexpensive video clicks.
Expert Review
Innovid is particularly interesting for sophisticated advertisers because modern video advertising is increasingly becoming a measurement problem as much as a media-buying problem.
The ability to understand:
where the ad appeared + who saw it + how they responded + what happened afterward
Final Rating: 4.8/5
7. Video.js
Video.js is not an advertising network. It is an open-source HTML5 video player and framework that can form part of the technical environment in which in-stream ads are displayed.
Company Overview
Video.js describes itself as an open-source web video player. The project supports common web media formats including streaming technologies such as HLS and DASH and works across desktop, mobile, tablet, and web-based Smart TV environments.
The current Video.js project is also undergoing a major v10 modernization, with the official site describing v10 as a ground-up rewrite for modern development and performance.
Best For
- Developers
- Publishers
- Video websites
- OTT platforms
- Custom video experiences
- Technical teams implementing advertising
Key Features
- HTML5 video
- HLS
- DASH
- Plugins
- Custom interfaces
- Web compatibility
- Extensible architecture
Pros
- Open source
- Highly customizable
- Large ecosystem
- Strong developer community
- Supports modern streaming
- Useful for custom video platforms
Cons
- Requires technical implementation
- Not an advertising marketplace
- Does not provide advertiser traffic by itself
- Monetization requires additional advertising infrastructure
Why Choose It?
Choose Video.js if you are building the video environment, not if you simply want to buy traffic.
Expert Review
Video.js is a good example of why advertisers should distinguish between:
ad network → ad server → ad standard → video player → measurement platform.
These are separate layers.
Final Rating: 4.7/5
8. Tremor Video (Tremor International)
Tremor Video is one of the strongest entries in this list for actual video advertising because its platform historically offered CTV, in-stream, out-stream, and in-app advertising.
Company Overview
Tremor Video was a major programmatic video advertising platform.
Tremor International stated that Tremor Video offered advertising across CTV, in-stream, out-stream, and in-app environments.
Tremor International later evolved its corporate structure and brand portfolio, making current company positioning different from the earlier standalone Tremor Video era.
Best For
- Video advertisers
- CTV campaigns
- Brand campaigns
- Cross-screen campaigns
- Audience targeting
- Programmatic video
Key Features
- In-stream video
- Outstream video
- CTV
- In-app advertising
- Cross-screen campaigns
- Data-driven targeting
Pros
- Strong video specialization
- CTV capabilities
- In-stream inventory
- Cross-screen reach
- Advanced targeting
- Enterprise advertising capabilities
Cons
- Product naming has evolved
- Enterprise orientation
- Pricing is not typically transparent like a self-service CPC network
- Requires campaign planning
Why Choose It?
Tremor is attractive when the campaign requires video scale rather than simply cheap clicks. It is especially relevant for advertisers who want to connect:
CTV + in-stream + mobile + audience data.
Expert Review
Tremor’s biggest strength is its relationship with the broader programmatic video ecosystem. The platform’s historical positioning around CTV and cross-screen video makes it particularly relevant as television budgets continue moving toward connected environments.
Final Rating: 4.8/5
9. Adzerk
Adzerk is a legacy name for what became Kevel, an advertising infrastructure company. It is important for advertisers and publishers building custom ad platforms, but it is not a conventional traffic-buying network.
Company Overview
Adzerk was founded as an advertising technology company focused on ad-serving infrastructure. The company later rebranded as Kevel.
This distinction is critical. Adzerk was not primarily competing with traditional media-buying networks. Its value was infrastructure.
Best For
- Publishers
- Marketplaces
- Retail media companies
- Developers
- Businesses building custom advertising systems
- Companies requiring API-based ad serving
Key Features
- Ad serving
- APIs
- Custom targeting
- Reporting
- Advertising infrastructure
- Custom ad platforms
Pros
- Flexible infrastructure
- Developer-focused
- Customizable
- Useful for building proprietary advertising systems
- Strong API orientation
Cons
- Not a traditional traffic network
- Requires technical resources
- Not ideal for an advertiser looking for immediate media inventory
- Adzerk branding is outdated
Why Choose It?
Choose the modern successor platform when your objective is to build or control advertising infrastructure, not simply buy video impressions.
Expert Review
Adzerk is valuable in this list primarily because it represents the infrastructure layer of digital advertising. That distinction helps readers understand that “ad network” is a broad term that can refer to very different businesses.
Final Rating: 4.2/5
10. Ooyala
Ooyala was an important video technology company serving OTT and digital media workflows, but its business and assets were acquired, making the original Ooyala platform a legacy entry in 2026.
Company Overview
Ooyala became known for video management, analytics, publishing, and OTT technology.
In 2019, Dalet announced its acquisition of the Ooyala Flex Media Platform business. Dalet described Ooyala Flex as a SaaS platform supporting OTT and digital media distribution workflows.
This means the original Ooyala business should not be treated as an independent modern in-stream ad network.
Best For
Historically:
- OTT businesses
- Broadcasters
- Digital publishers
- Video content companies
- Video management
- Media distribution
Key Features
- Video management
- OTT workflows
- Digital distribution
- Media operations
- Video technology
- Analytics
Pros
- Important video technology history
- Strong OTT positioning
- Enterprise media capabilities
- Useful for understanding digital video infrastructure
Cons
- Legacy platform
- Original business changed through acquisitions
- Not a conventional advertiser traffic network
- Current advertiser availability is not comparable with active ad networks
Why Choose It?
Ooyala is primarily relevant if you are researching the development of OTT and digital video technology.
Expert Review
Ooyala demonstrates another important distinction:
Video infrastructure and video advertising are related, but they are not the same business.
An OTT company may need video hosting, encoding, content management, analytics, ad serving, and monetization—all supplied by different technologies.
Final Rating: 3.8/5
Commission Comparison
Because these are primarily advertising platforms and technologies rather than affiliate networks, traditional commission rates do not apply.
| Platform | Advertiser Commission | Affiliate Commission | Relevant Buying Metric |
| Google AdSense for Video | N/A | N/A | Historical video monetization |
| SpotX | N/A | N/A | CPM / programmatic buying |
| BrightRoll | N/A | N/A | CPM / programmatic |
| VAST | N/A | N/A | Ad-serving infrastructure |
| AdColony | N/A | N/A | Mobile advertising |
| Innovid | N/A | N/A | Enterprise advertising technology |
| Video.js | N/A | N/A | Software/infrastructure |
| Tremor Video | N/A | N/A | CPM / video buying |
| Adzerk | N/A | N/A | Software/infrastructure |
| Ooyala | N/A | N/A | Enterprise video technology |
Important
Do not compare these platforms using affiliate-network metrics such as:
- 20% commission
- 30-day cookie
- $50 minimum payout
- weekly publisher payments
Those metrics describe affiliate programs, not video advertising buying platforms.
Cookie Duration Comparison
| Platform | Cookie Duration |
| Google AdSense for Video | N/A |
| SpotX | N/A |
| BrightRoll | N/A |
| VAST | N/A |
| AdColony | N/A as a standard affiliate metric |
| Innovid | N/A |
| Video.js | N/A |
| Tremor Video | N/A |
| Adzerk | N/A |
| Ooyala | N/A |
Cookie duration is not a meaningful ranking factor for this category. For performance advertisers, focus instead on attribution windows supported by the buying and measurement platforms.
Payment Comparison
Advertisers generally pay platforms or media sellers rather than receiving publisher commissions.
| Platform | Advertiser Payment Model | Public Standard Minimum |
| Google AdSense for Video | Discontinued | N/A |
| SpotX | Programmatic / enterprise | Varies |
| BrightRoll | Historical programmatic | N/A |
| VAST | Technology standard | N/A |
| AdColony | Mobile advertising | Varies |
| Innovid | Enterprise technology | Custom |
| Video.js | Open source | Free |
| Tremor Video | Programmatic / enterprise | Varies |
| Adzerk | Software/infrastructure | Custom |
| Ooyala | Legacy enterprise technology | N/A |
Never assume that an ad platform with no published minimum budget requires no minimum budget. Enterprise platforms frequently negotiate campaigns based on:
- Spend
- Geography
- Inventory
- Targeting
- Technology
- Contract
- Campaign duration
- Service level
Approval Comparison
| Platform | Advertiser Approval | Ease of Entry |
| Google AdSense for Video | Closed | Not available |
| SpotX | Enterprise / programmatic | Moderate–Hard |
| BrightRoll | Legacy | Not available |
| VAST | Technical implementation | Developer-dependent |
| AdColony | Platform-dependent | Moderate |
| Innovid | Enterprise | Hard |
| Video.js | Open source | Easy technically |
| Tremor Video | Enterprise/programmatic | Moderate–Hard |
| Adzerk | Business/software onboarding | Moderate |
| Ooyala | Legacy | Not available |
Buying Guide: How to Choose an In-Stream Ad Network
Before spending money, answer these questions.
1. What Is Your Campaign Objective?
Do not start with the network. start with the outcome.
Possible objectives include:
- Brand awareness
- Website traffic
- App installs
- Lead generation
- Ecommerce sales
- Subscription growth
- CTV reach
- Video completion
A platform optimized for reach may not be ideal for CPA.
2. What Geography Are You Targeting?
A platform may have excellent US inventory but limited Australian or Canadian inventory.
Always evaluate:
- United States
- United Kingdom
- Canada
- Australia
- Europe
- Asia-Pacific
- Emerging markets
3. What Device Matters?
Decide whether you want:
- Desktop
- Mobile web
- Mobile app
- Connected TV
- Smart TV
- Tablet
4. What Buying Model Do You Need?
Common models include:
CPM
Best for:
- Awareness
- Reach
- Brand campaigns
CPV
You pay for video views. Useful when video engagement matters.
CPC
You pay for clicks. Useful for performance campaigns where traffic matters.
CPA
You pay based on conversions. potentially attractive for performance advertisers, but availability varies significantly across video platforms.
Creative Best Practices for In-Stream Ads
Keep the First Seconds Strong
The opening seconds determine whether the viewer understands why they should continue watching.
Start with:
- The problem
- The benefit
- The product
- A strong visual
- A compelling statement
Avoid wasting the opening seconds on a long logo animation.
Design for Sound-Off Viewing
Even though video supports audio, many users may encounter video advertising with reduced or absent sound.
Use:
- Captions
- On-screen text
- Visual storytelling
- Strong product demonstrations
Use a Clear CTA
Examples:
- Shop Now
- Learn More
- Start Free
- Download Now
- Get the Guide
- Try It Today
The CTA should match the landing page.
How to Track In-Stream Campaign Performance
At minimum, monitor:
| Metric | What It Tells You |
| Impressions | How often the ad was served |
| Reach | How many users were exposed |
| Frequency | Average exposures per user |
| Video starts | Initial engagement |
| Completion rate | How often users finished |
| VTR | Video viewing rate |
| CTR | Click engagement |
| CPC | Cost per click |
| CPA | Cost per acquisition |
| ROAS | Revenue efficiency |
| Viewability | Whether the ad was actually viewable |
| Fraud rate | Traffic quality |
Common Mistakes Advertisers Make
Mistake 1: Choosing the Cheapest CPM
The cheapest impression is not automatically the best impression. A $1 CPM campaign can be more expensive than a $10 CPM campaign if the cheaper inventory produces no conversions.
Mistake 2: Ignoring Placement Quality
Always investigate:
- Publisher
- App
- Website
- CTV environment
- Content category
- Geography
- Device
Mistake 3: Using One Creative
Test multiple creatives. Try variations in:
- Hook
- CTA
- Length
- Offer
- Opening scene
- Voiceover
- Captions
Mistake 4: Measuring Only Clicks
Video advertising is not always a direct-response channel.
Consider:
- Completed views
- Assisted conversions
- Branded search
- Direct traffic
- Conversion lift
- Incremental revenue
Mistake 5: Ignoring Ad-Tech Status
This is particularly important with older lists.
A platform can:
- Be acquired
- Be renamed
- Merge with another company
- Discontinue a product
- Change its buying interface
- Shift from an ad network to an SSP
- Become infrastructure rather than inventory
Future Trends in In-Stream Advertising
1. Connected TV Will Continue to Matter
CTV has become one of the most important growth areas in video advertising. Advertisers increasingly want television-like reach combined with digital targeting and measurement.
2. AI Will Improve Creative Optimization
AI can increasingly help advertisers:
- Generate video variations
- Adapt scripts
- Create multiple hooks
- Personalize creative
- Generate captions
- Predict performance
- Optimize placements
3. Measurement Will Become More Important
Advertisers increasingly want independent answers to:
- Was the ad shown?
- Was it viewable?
- Who saw it?
- Was the impression legitimate?
- Did the viewer convert?
- Was the conversion incremental?
That makes measurement technology increasingly important.
4. Privacy Will Reshape Targeting
Advertisers cannot assume that historical cookie-based targeting will remain unchanged.
The industry is increasingly focused on:
- First-party data
- Contextual targeting
- Privacy-preserving identity
- Clean rooms
- Consent
- Aggregated measurement
5. Programmatic CTV Will Grow
CTV inventory is increasingly becoming accessible through programmatic buying.
That allows advertisers to bring more digital-style measurement and targeting into television-like environments.
Frequently Asked Questions (FAQs)
What is the best in-stream ad network for advertisers?
For direct in-stream and CTV relevance, Tremor Video is one of the strongest names in this list. For advanced CTV advertising technology and measurement, Innovid is a stronger choice.
Which platform is best for mobile video advertising?
AdColony has historically been one of the strongest mobile-video names, but advertisers need to evaluate its current post-acquisition product structure.
Which platform is best for CTV?
Innovid and the Magnite ecosystem are among the most relevant entries here for CTV-focused advertising technology.
Which platform is easiest for beginners?
None of these ten should automatically be considered a beginner-friendly traffic network. Several are technical or enterprise products.
What happened to Innovid?
Mediaocean completed its acquisition of Innovid in February 2025 and subsequently established Innovid as the unified brand for its global ad-tech business.
Is Tremor Video still relevant?
Yes, its video advertising technology and capabilities remain highly relevant to understanding CTV and programmatic video, although the broader corporate structure and branding have evolved.
What is the difference between an ad network and an ad server?
An ad network connects advertising demand with available inventory, while an ad server primarily handles the delivery and management of advertisements.
What is the difference between an ad server and VAST?
VAST is a standard used to communicate video ad information between systems; an ad server is a technology platform that manages and delivers advertisements.
Can I use VAST with Video.js?
Video.js can be extended with advertising integrations, allowing a video player environment to work with video advertising technologies.
Should advertisers use CPM or CPC for video?
It depends on the campaign objective. CPM is common for awareness and reach, while CPC can be useful when traffic is the primary goal.
What makes a good in-stream video ad?
A good in-stream ad quickly communicates its value, works with or without sound, uses a strong opening hook, and includes a clear CTA.
How long should an in-stream ad be?
There is no universal ideal length. Short ads can work well for simple offers, while longer ads may be useful for products requiring more explanation.
Should advertisers test multiple video creatives?
Yes. Creative testing is one of the most important ways to determine which message, hook, offer, and CTA performs best.
Expert Decision Framework
Before choosing an in-stream advertising platform, score each candidate from 1–5 on:
| Factor | Weight |
| Relevant video inventory | 25% |
| Audience targeting | 15% |
| Traffic quality | 15% |
| Measurement | 15% |
| Geographic reach | 10% |
| Pricing efficiency | 10% |
| Brand safety | 5% |
| Technical integration | 5% |
Then calculate a weighted score. This is more useful than simply selecting the platform with the highest advertised reach.
What Advertisers Should Ask Before Spending Money
Before signing a contract or launching a large campaign, ask:
- Where will my ads appear?
- Which countries are available?
- Is the inventory direct or resold?
- What percentage is CTV?
- What percentage is mobile?
- What video formats are supported?
- Can I control frequency?
- Can I exclude placements?
- Can I exclude apps?
- Can I exclude categories?
- Is third-party measurement supported?
- How is viewability measured?
- What fraud controls are available?
Final Verdict
The 10 Best In-Stream Ad Networks in 2026 include a mix of video advertising platforms, ad-tech solutions, and technologies. For advertisers seeking traffic, Tremor Video, Innovid, SpotX/Magnite, and AdColony are among the most relevant options.
For video ad delivery and infrastructure, VAST and Video.js are also important. However, several names on this list are legacy platforms that have been acquired, renamed, or discontinued, so advertisers should always verify current availability before investing.
The best choice ultimately depends on your target audience, traffic goals, budget, targeting needs, and campaign format.
Read More
Explore more advertising options with our guides to [Best Ad Networks for Advertisers], [Best Video Ad Networks], and [Best CPM Ad Networks].
Key Takeaways
- Tremor Video is one of the most directly relevant names for in-stream and CTV video advertising.
- Innovid is particularly strong for CTV, ad delivery, measurement, and enterprise advertising technology.
- SpotX remains historically important but was acquired by Magnite in 2021.
- AdColony has strong historical relevance in mobile video advertising but has undergone major ownership changes.
- VAST is not an ad network; it is a video advertising standard.
- Video.js is not an ad network; it is an open-source video player.
- Adzerk became Kevel, making older Adzerk references potentially misleading.
- Ooyala’s Flex Media Platform business was acquired by Dalet in 2019.
- Google AdSense for Video was discontinued on May 31, 2026.
