# Best Supply Side Platforms (SSP) - Page 5 *By [Yukta Rustagi](https://research.g2.com/insights/author/yukta-rustagi)* Supply side platforms (SSPs) allow publishers to make money from their websites by creating and selling ad inventory to marketers on an impression-by-impression, or visitor-by-visitor, basis. By selling ads in real time, publishers can provide advertisers with better visibility into individual impressions and gain instant clarity into advertising demand. This ensures that publishers sell their inventory at the most optimal price point and leverage their ad inventory to the fullest extent. SSPs are used in conjunction with publisher ad servers—either as a single product or two separate integrated products—that provide the functionality to manage ad inventory and traffic incoming ads. SSPs, in turn, give publisher ad servers the ability to sell their advertising inventory in real time through advertising exchanges or directly to advertisers’ demand side platforms (DSPs). To qualify for inclusion in the SSP category, a product must: - Include publisher ad server functionality or be able to integrate with publisher ad servers - Connect to ad exchanges and directly to DSPs to sell ad inventory in real times ## How Many Supply Side Platforms (SSP) Products Does G2 Track? **Total Products under this Category:** 100 ### Category Stats (May 2026) - **Average Rating**: 4.29/5 (↑0.01 vs Apr 2026) - **New Reviews This Quarter**: 9 - **Buyer Segments**: Small-Business 41% │ Mid-Market 33% │ Enterprise 26% - **Top Trending Product**: AdBook (+0.122) *Last updated: May 19, 2026* ## How Does G2 Rank Supply Side Platforms (SSP) Products? **Why You Can Trust G2's Software Rankings:** - 30 Analysts and Data Experts - 1,100+ Authentic Reviews - 100+ Products - Unbiased Rankings G2's software rankings are built on verified user reviews, rigorous moderation, and a consistent research methodology maintained by a team of analysts and data experts. Each product is measured using the same transparent criteria, with no paid placement or vendor influence. While reviews reflect real user experiences, which can be subjective, they offer valuable insight into how software performs in the hands of professionals. Together, these inputs power the G2 Score, a standardized way to compare tools within every category. ## Which Supply Side Platforms (SSP) Is Best for Your Use Case? - **Leader:** [Google Ad Manager](https://www.g2.com/products/google-ad-manager/reviews) - **Highest Performer:** [Opti Digital](https://www.g2.com/products/opti-digital/reviews) - **Easiest to Use:** [GaleForceMedia](https://www.g2.com/products/galeforcemedia/reviews) - **Top Trending:** [EX.CO](https://www.g2.com/products/ex-co/reviews) - **Best Free Software:** [EX.CO](https://www.g2.com/products/ex-co/reviews) --- **Sponsored** ### BidMachine BidMachine is a mobile advertising platform that helps app publishers grow in-app ad revenue and gives advertisers, DSPs, and agencies access to SDK-direct in-app inventory with first-party signals. The platform operates as both an in-app bidding solution and a supply-side platform, connecting mobile publishers to programmatic demand through a lightweight SDK integration. Publishers add incremental demand sources to their existing monetization stack, run transparent real-time auctions, and access brand advertiser budgets through direct, SPO-aligned supply paths. BidMachine processes over 1 trillion ad requests monthly and reaches 600 million verified SDK users across gaming, utility, and lifestyle apps. Core features: SDK: lightweight in-app bidding integration that adds premium global demand to publisher auctions, built to minimize latency and preserve app performance Mediation: transparent auction mechanics with full visibility into how demand sources compete, including pricing, fill data, and demand prioritization controls Exchange: PMP and open auction access for DSPs and agencies buying SDK-powered in-app inventory with first-party signals and SPO-aligned supply paths UA: performance campaign tools for advertisers and UA teams, with CPI and ROAS optimization powered by rich in-app signals and unified reporting across inventory, creatives, and geos DIRECT Placements: a dedicated supply path that routes brand advertiser budgets to premium publishers through SDK-direct, SPO-aligned inventory, with onboarding taking approximately two weeks after agreement signing and ads.txt update Who uses BidMachine: Publishers and monetization managers growing ARPDAU and LTV by adding incremental demand alongside existing networks Advertisers and UA teams running performance campaigns who need high-quality, SDK-direct in-app supply DSPs and agencies seeking cleaner supply paths with richer first-party signals for programmatic buying Publishers can get started via self-serve sign-up or by contacting the sales team directly. [Visit website](https://www.g2.com/external_clickthroughs/record?secure%5Bad_program%5D=ppc&secure%5Bad_slot%5D=category_product_list&secure%5Bcategory_id%5D=286&secure%5Bdisplayable_resource_id%5D=615&secure%5Bdisplayable_resource_type%5D=Category&secure%5Bmedium%5D=sponsored&secure%5Bplacement_reason%5D=neighbor_category&secure%5Bplacement_resource_ids%5D%5B%5D=615&secure%5Bprioritized%5D=false&secure%5Bproduct_id%5D=1702679&secure%5Bresource_id%5D=286&secure%5Bresource_type%5D=Category&secure%5Bsource_type%5D=category_page&secure%5Bsource_url%5D=https%3A%2F%2Fwww.g2.com%2Fcategories%2Fsupply-side-platform-ssp%3Fpage%3D5&secure%5Btoken%5D=925f9575cad05beb8299481be25a397f5b6bfd1d34698440c3bb1f922dc878be&secure%5Burl%5D=https%3A%2F%2Fhubs.ly%2FQ04j068b0&secure%5Burl_type%5D=custom_url) --- ## What Is Supply Side Platforms (SSP)? [Digital Advertising Tech](https://www.g2.com/categories/digital-advertising-tech) ## What Software Categories Are Similar to Supply Side Platforms (SSP)? - [Mobile Advertising Software](https://www.g2.com/categories/mobile-advertising) - [App Monetization Platforms](https://www.g2.com/categories/app-monetization-platforms) - [Publisher Ad Server Software](https://www.g2.com/categories/publisher-ad-server)