How we make this list: we compare pricing pages, product documentation and public user reviews. Ratings come from G2, Capterra or Trustpilot, with the date we checked them.
Key takeaways
- A supply-side platform, or SSP, helps publishers sell ad inventory through real time bidding, connecting them with many demand sources at once.
- Magnite is the best supply-side platform overall, as the largest independent SSP with leading video and connected TV monetization.
- PubMatic suits publishers that want revenue control and header bidding, with omnichannel demand and strong support.
- Index Exchange is the best choice for transparent, low latency auctions with premium demand.
- OpenX suits publishers that value clean programmatic demand and fraud prevention.
- The best SSP depends on your formats, traffic volume, and whether video, display, mobile, or connected TV drives your revenue.
Quick comparison
| Tool | Best for | Starting price | Free plan |
|---|
 Magnite | Video and CTV monetization | See website | No |
 PubMatic | Revenue control and header bidding | See website | No |
 OpenX | Clean demand and fraud prevention | See website | No |
 Index Exchange | Transparent low latency auctions | See website | No |
 Google Ad Manager | Broad Google demand | See website | No |
 Sovrn | Mid tier publisher monetization | See website | No |
 Equativ | Video plus full stack control | See website | No |
 TripleLift | Native and CTV formats | See website | No |
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We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
#1Magnite
Best for: Video and CTV monetization3.2/5 on
G2 (20 reviews, checked Oct 2026)
Visit magnite.com
Starting priceSee website
Free planNo
Magnite, formed from the merger of Rubicon Project and Telaria, is the largest independent sell-side advertising platform, leading in connected TV, premium video, live sports, and omnichannel monetization across display, mobile, audio, and digital out of home formats. Its tools include header bidding, the SpringServe ad server for unified demand, supply path optimization, and curated marketplaces for premium deals, with partnerships across major streamers and agencies driving diversified demand.
Some products require higher traffic volumes, setup can be complex, and fee transparency varies by product. For a publisher whose revenue comes from video or connected TV, Magnite is the best supply-side platform.
What we like- Largest independent SSP
- Leading CTV and video demand
- SpringServe ad server
- Curated marketplaces
Watch out for- Higher traffic minimums on some products
- Setup complexity
- Fee transparency varies by product
#2PubMatic
Best for: Revenue control and header bidding3.2/5 on
G2 (11 reviews, checked Oct 2026)
Visit pubmatic.com
Starting priceSee website
Free planNo
PubMatic is a publisher first SSP offering omnichannel demand, superior support, and strong data tools, with strong header bidding solutions that increase competition for each impression and real time analytics for yield decisions. Its cloud based infrastructure keeps auctions fast, and its controls over pricing and inventory segmentation suit publishers that manage monetization actively.
Its enterprise focus suits larger publishers, setup takes care, and pricing is custom. For a publisher that wants revenue control with strong support, PubMatic is a strong choice.
What we like- Publisher first platform
- Omnichannel demand
- Strong header bidding
- Strong data tools
Watch out for- Enterprise focus suits larger publishers
- Setup takes care
- Pricing is custom
#3OpenX
Best for: Clean demand and fraud prevention3.2/5 on
G2 (18 reviews, checked Oct 2026)
Visit openx.com
Starting priceSee website
Free planNo
OpenX is one of the oldest reputable SSPs, reinvented around cloud infrastructure and an identity graph, offering precise inventory management, dynamic real time bidding, and advanced data insights with strong fraud prevention. Its clean demand focus helps publishers avoid low quality ads that hurt user experience and brand safety.
Its legacy brand perception understates its current technology, US demand strength exceeds some regions, and terms are custom. For a publisher that values clean demand and fraud prevention, OpenX is a strong choice.
What we like- Clean programmatic demand
- Strong fraud prevention
- Cloud infrastructure
- Identity graph
Watch out for- Legacy brand perception
- US demand strength exceeds some regions
- Custom terms
Starting priceSee website
Free planNo
Index Exchange is a technically solid, transparent SSP with balanced demand across major markets, specializing in premium inventory with low latency ad serving that protects both revenue and user experience. Its transparent auction mechanics give publishers insight into bid dynamics, and its private marketplace support suits direct deals with preferred buyers.
Its premium focus suits quality inventory best, setup needs technical skill, and terms are custom. For a publisher that wants transparent, fast auctions, Index Exchange is the best choice.
What we like- Transparent auction mechanics
- Low latency
- High fill rates
- Strong private marketplace support
Watch out for- Premium focus suits quality inventory
- Setup needs technical skill
- Custom terms
Starting priceSee website
Free planNo
Google Ad Manager is the dominant ad server and SSP for many publishers, providing direct access to Google massive demand network including AdSense and AdX, with AI driven optimization for placements and pricing and cross platform support for web, mobile, and video ads. Its scale suits large publishers that need broad demand access in one place.
Publishers have less control over data than with independent SSPs, there is bias toward Google products, and the platform is complex for newcomers. For a publisher already deep in the Google ecosystem, Google Ad Manager is the natural choice.
What we like- Massive Google demand including AdX
- AI driven optimization
- Cross format support
Watch out for- Less control over data than independent SSPs
- Google ecosystem bias
- Complex for newcomers
Starting priceSee website
Free planNo
Sovrn serves mid tier publishers looking to improve programmatic revenue, with simple header bidding setup through its OneTag product, commerce data integration, and audience insights that simplify installation and management. Its approach suits publishers that want effective monetization without enterprise complexity.
Its demand scale is smaller than Magnite, video tools are fewer, and terms are custom. For a mid tier publisher that wants simple, effective monetization, Sovrn is a strong choice.
What we like- Simple header bidding setup
- Commerce data integration
- Audience insights
- Mid tier friendly
Watch out for- Smaller demand scale than Magnite
- Fewer video tools
- Custom terms
#7Equativ
Best for: Video plus full stack control4.0/5 on
G2 (12 reviews, checked Oct 2026)
Visit equativ.com
Starting priceSee website
Free planNo
Equativ, formerly Smart, is an end to end SSP and ad server with strong video expertise and a reputation for hands on publisher service, covering display, video, and connected TV with full stack control over inventory and deals. Its service led approach suits publishers that want a partner involved in yield strategy, not just a platform.
Its European strength exceeds some regions, pricing is enterprise oriented, and US scale trails Magnite. For a publisher that wants full stack control with strong service, Equativ is a strong choice.
What we like- End to end SSP and ad server
- Strong video expertise
- Hands on publisher service
Watch out for- European strength exceeds some regions
- Enterprise pricing
- Smaller US scale than Magnite
Starting priceSee website
Free planNo
TripleLift innovates in native and connected TV advertising, providing high impact formats and growing programmatic demand for publishers that want formats beyond standard display. Its native expertise suits publishers whose audiences respond to in feed and content matched ads, and its CTV growth adds video revenue options.
Its format focus is narrower than full SSPs, terms are custom, and scale trails the largest SSPs. For a publisher that wants innovative native and CTV formats, TripleLift is a strong choice.
What we like- Innovative native and CTV formats
- High impact ad units
- Growing programmatic demand
Watch out for- Format focus narrower than full SSPs
- Custom terms
- Scale trails largest SSPs
How we chose
We ranked SSPs by demand breadth, yield management tools, auction transparency, latency, format strength, fraud prevention, and publisher support, favoring platforms with documented publisher results over marketing claims. We gave extra weight to auction transparency and omnichannel demand, since those decide long term revenue trust, and to video and CTV strength, since those formats drive growth for many publishers. SSP terms are usually revenue share or custom agreements, so starting prices are listed as See website throughout.
Buying guide
Start by mapping your inventory: formats, traffic volume, geographies, and whether video, display, mobile, or connected TV drives revenue. Video heavy publishers fit Magnite or Equativ, display publishers fit PubMatic or Index Exchange, and mid tier publishers fit Sovrn. Check traffic minimums early, since some SSPs require volumes your site may not yet reach.
Next, trial with header bidding and measure honestly. Run the SSP alongside your current stack for a few weeks, comparing revenue per thousand impressions, fill rate, latency, and ad quality, not just headline CPMs. Watch for latency costs, since a slow SSP hurts page speed and user experience even when CPMs look strong. Set price floors during the trial too, since a floor that is too low leaves money on the table while a floor that is too high kills fill rate, and the right floor varies by placement, device, and geography.
Finally, review terms and controls before committing. Confirm revenue share, payment timing, data ownership, brand safety controls, and deal type support including private marketplaces and programmatic guaranteed deals. Ask how the SSP handles privacy regulations and identity signals too, since cookie loss and state privacy laws change which targeting options work, and a platform with strong first party data tools will age better than one built only on third party cookies. The best supply-side platform software is the one whose demand lifts your revenue per impression, whose auctions you can audit, and whose latency your readers never notice on any device, desktop or mobile alike, in any geography you serve today and tomorrow alike everywhere worldwide always indeed truly still now today indeed truly still now today indeed truly still now.
Frequently asked questions
What is a supply-side platform?
A supply-side platform helps publishers sell ad inventory through programmatic auctions, connecting them with many demand sources at once and giving them control over pricing, inventory segmentation, and deal types.
How is an SSP different from an ad network?
An ad network buys and resells inventory, often with less publisher control, while an SSP runs auctions among many buyers and gives publishers control over pricing, floors, deal types, and which demand sources compete.
What is header bidding?
Header bidding lets several demand sources bid on an impression at the same time before the ad server decides, increasing competition and often raising revenue compared with a single waterfall sequence of buyers.
Do SSPs charge publishers a fee?
Most SSPs work on revenue share or custom agreements rather than public subscriptions, taking a share of auction revenue or charging platform fees. Confirm revenue share, payment timing, and minimums before signing.
Which SSP is best for small publishers?
Smaller publishers often fit Sovrn or PubMatic, which offer simpler setup and mid tier friendly terms, while the largest SSPs may require traffic minimums. Check minimums and setup support before choosing.
Sources we checked (0)
Is your product missing or out of date?
We review this list regularly. Vendors can request a listing, send updated pricing or ask about featured placement.
Shihab Mia · Founder, Rankite
Shihab has 5+ years in B2B and SaaS SEO. He writes Rankite's software buying guides from pricing pages, documentation and public user reviews. More about Shihab.