Best Supply Side Platforms (SSP)

How Many Supply Side Platforms (SSP) Products Does G2 Track?

Total Products under this Category: 102

Category Stats (Sep 2026)

  • Average Rating: 4.28/5 The average rating of products in this category, based on all submitted ratings

Last updated: September 01, 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
  • 102+ 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.

G2 Grid® for Supply Side Platforms (SSP)

G2 Grid® for Supply Side Platforms (SSP) plotting products by satisfaction and market presence

Highlighted products: Google Ad Manager, Opti Digital, 33Across, EX.CO, BidMachine, GaleForceMedia, Sharethrough, and OpenX.

Underlying data: [Grid® JSON](https://www.g2.com/categories/supply-side-platform-ssp/grids.json?focus%5B%5D=google-ad-manager&focus%5B%5D=opti-digital&focus%5B%5D=33across&focus%5B%5D=ex-co&focus%5B%5D=bidmachine&focus%5B%5D=galeforcemedia&focus%5B%5D=sharethrough&focus%5B%5D=openx)

Google Ad Manager

DoubleClick for Publishers is a complete ad revenue engine that helps publishers capture the full value of every impression across demand sources and channels. Seamless integration with DoubleClick Ad Exchange provides instant connection to millions of quality advertisers, while the natively integrated sales management platform streamlines operations for maximized sales at minimized costs.

Average Rating: 4.2/5.0

Total Reviews: 232

How Do G2 Users Rate Google Ad Manager?

  • SSP Functionality : 8.2/10 (Category avg: 8.3/10)
  • Impression Targeting: 8.6/10 (Category avg: 8.4/10)
  • Ease of Admin: 7.9/10 (Category avg: 8.4/10)
  • Bid Reporting: 8.2/10 (Category avg: 8.1/10)

Who Is the Company Behind Google Ad Manager?

  • Seller: Google
  • Year Founded: 1998
  • HQ Location: Mountain View, CA
  • Twitter: @google
    31,899,995 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    301,144 employees on LinkedIn®
  • Ownership: NASDAQ:GOOG

Who Uses This Product?

  • Top Industries: Marketing and Advertising, Publishing
  • Company Size: 42% Medium, 37% Small

What Are Recent G2 Reviews of Google Ad Manager?

What Are G2 Users Discussing About Google Ad Manager?

Opti Digital

Opti Digital is an advertising technology (AdTech) designed to help media publishers optimize their advertising revenue through innovative and effective strategies. Established in 2018, Opti Digital focuses on providing advanced technologies that enhance the monetization capabilities of publishers and advertisers alike. With a commitment to innovation and efficiency, the company employs cutting-edge solutions such as dynamic flooring, original ad formats, ad optimization features, real-time granular insights and an ad management wrapper to meet the evolving needs of the digital advertising landscape. The target audience for Opti Digital includes global media publishers and channel partners seeking to maximize their advertising revenue while navigating the complexities of the digital marketplace. By leveraging artificial intelligence and data-driven strategies, Opti Digital empowers its clients to unlock new monetization opportunities and remain competitive in a rapidly changing environment. The platform is particularly beneficial for publishers who are looking to enhance their ad performance and optimize their ad inventory management. Key features of Opti Digital include dynamic price flooring, which allows publishers to set flexible pricing strategies for their ad inventory, and innovative ad formats, based on social display ads that engage users while maximizing revenue potential. The ad management wrapper simplifies the integration of various ad technologies, enabling publishers to streamline their operations and improve overall efficiency. Additionally, Opti Digital is committed to providing cookieless solutions, which are increasingly important in today's privacy-conscious digital landscape. This focus not only helps clients stay compliant with regulations but also positions them to adapt to future changes in the advertising ecosystem. Opti Digital's partnerships with notable publishers and organizations, such as Euronews, 1XL, Sporskeeda, Valnet, Verticalscope, Snack Media, Gizmodo, and the IAB’s Transparency and Consent Framework, further enhance its credibility and reach within the industry. As a recognized Google Certified Publishing Partner (GCPP) and a technology partner of Prebid, Opti Digital demonstrates its commitment to transparency and best practices in digital advertising. By prioritizing sustainability and reducing the carbon footprint of ads, Opti Digital also aligns with the growing demand for environmentally responsible advertising solutions. This multifaceted approach ensures that publishers can not only optimize their revenue but also contribute positively to the industry and the environment.

Average Rating: 4.5/5.0

Total Reviews: 39

How Do G2 Users Rate Opti Digital?

  • SSP Functionality : 8.8/10 (Category avg: 8.3/10)
  • Impression Targeting: 8.7/10 (Category avg: 8.4/10)
  • Ease of Admin: 9.0/10 (Category avg: 8.4/10)
  • Bid Reporting: 7.4/10 (Category avg: 8.1/10)

Who Is the Company Behind Opti Digital?

  • Seller: Opti Digital
  • Company Website:
  • Year Founded: 2018
  • HQ Location: Céret, FR
  • LinkedIn® Page: www.linkedin.com
    52 employees on LinkedIn®

Who Uses This Product?

  • Top Industries: Marketing and Advertising, Online Media
  • Company Size: 57% Small, 40% Medium

What Are Recent G2 Reviews of Opti Digital?

33Across

33Across makes the programmatic advertising ecosystem work without cookies, across supply-side platforms, demand-side platforms, publishers, data companies, agencies, and everything in between. Leading global advertisers, platforms, and publishers rely on 33Across to move past cookies and reach consumers in a simple, fair, and transparent manner.

Average Rating: 4.3/5.0

Total Reviews: 125

How Do G2 Users Rate 33Across?

  • SSP Functionality : 8.3/10 (Category avg: 8.3/10)
  • Impression Targeting: 8.3/10 (Category avg: 8.4/10)
  • Ease of Admin: 7.8/10 (Category avg: 8.4/10)
  • Bid Reporting: 8.1/10 (Category avg: 8.1/10)

Who Is the Company Behind 33Across?

  • Seller: 33Across
  • Year Founded: 2007
  • HQ Location: NY, US
  • Twitter: @33Across
    1,238 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    52 employees on LinkedIn®

Who Uses This Product?

  • Top Industries: Computer Software, Information Technology and Services
  • Company Size: 58% Small, 30% Medium

What Do G2 Reviewers Say About 33Across?

AI-generated summary from verified user reviews

Pros
  • Users value the data-driven innovation of 33Across, enhancing ad effectiveness while prioritizing user privacy and brand safety.
  • Users value the reliability of 33Across, enabling confident decision-making for improved advertising outcomes with privacy assurance.
Cons
  • Users find the complexity of the platform a barrier, especially for those who are new to it.
  • Users find the difficult learning curve frustrating, suggesting improvements in documentation and onboarding for better usability.
  • Users find the inefficient reporting to be problematic, often needing better guidance to navigate the system effectively.

What Are Recent G2 Reviews of 33Across?

EX.CO

EX.CO is the smarter video technology company harnessing the power of machine learning to maximize revenue across every screen—web, mobile apps, CTV, and DOOH. As a trusted partner to leading media organizations worldwide—including Advance Local, Hearst Newspapers, Motorsport Network, The Arena Group, and Ziff Davis—EX.CO sets the standard for video monetization with its online video platform and AI-driven yield engine, built for growth, control, and transparency. Since 2012, EX.CO has been shaping the future of video. Headquartered in New York City with a global team, the company is proudly backed by The Walt Disney Company, Saban Ventures, Viola Group, 83North, and others.

Average Rating: 4.3/5.0

Total Reviews: 23

How Do G2 Users Rate EX.CO?

  • SSP Functionality : 10.0/10 (Category avg: 8.3/10)
  • Ease of Admin: 8.5/10 (Category avg: 8.4/10)

Who Is the Company Behind EX.CO?

  • Seller: EX.CO
  • Year Founded: 2012
  • HQ Location: New York, US
  • Twitter: @EXCOPlatform
    196 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    328 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 40% Medium, 36% Small

What Do G2 Reviewers Say About EX.CO?

AI-generated summary from verified user reviews

Pros
  • Users praise the exceptional customer support from EX.CO, highlighting their responsiveness and valuable strategic insights.
  • Users value EX.CO for their outstanding customer satisfaction, appreciating their exceptional service and responsiveness to diverse needs.
  • Users highlight the immediate revenue impact and exceptional customer service provided by EX.CO for business growth.
  • Users value the flexibility and monetisation support of EX.CO, enjoying seamless integration and exceptional customer service.
  • Users value the ease of use of EX.CO, noting a simple setup and efficient customer support throughout their experience.
Cons
  • Users note that the dashboard interface could be improved for better video performance and metrics analysis.
  • Users feel that the analytics limitations hinder deep insights into video performance compared to monetization metrics.
  • Users face cost limitations due to insufficient availability of tailored syndicated content for specific needs.
  • Users experience a short learning curve with EX.CO but find support helpful to overcome initial challenges.
  • Users find the limited geographic data of EX.CO insufficient for their hyper-local content needs.

What Are Recent G2 Reviews of EX.CO?

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.

Average Rating: 4.7/5.0

Total Reviews: 15

How Do G2 Users Rate BidMachine?

  • Impression Targeting: 10.0/10 (Category avg: 8.4/10)
  • Bid Reporting: 8.3/10 (Category avg: 8.1/10)

Who Is the Company Behind BidMachine?

  • Seller: BidMachine
  • Company Website:
  • Year Founded: 2019
  • HQ Location: N/A
  • LinkedIn® Page: www.linkedin.com
    151 employees on LinkedIn®

Who Uses This Product?

  • Top Industries: Computer Games
  • Company Size: 67% Medium, 20% Small

What Are Recent G2 Reviews of BidMachine?

GaleForceMedia

GaleForceMedia media buying software is a web-based software platform designed to streamline media processes. GaleForceMedia helps media buyers eliminate redundancies like duplicate field requirements, flexibly manage buys of different media types, accurately measure ad performance and effortlessly reconcile invoices.

Average Rating: 4.6/5.0

Total Reviews: 20

How Do G2 Users Rate GaleForceMedia?

  • SSP Functionality : 9.1/10 (Category avg: 8.3/10)
  • Impression Targeting: 8.5/10 (Category avg: 8.4/10)
  • Ease of Admin: 9.3/10 (Category avg: 8.4/10)
  • Bid Reporting: 9.3/10 (Category avg: 8.1/10)

Who Is the Company Behind GaleForceMedia?

Who Uses This Product?

  • Top Industries: Marketing and Advertising
  • Company Size: 65% Small, 20% Medium

What Are Recent G2 Reviews of GaleForceMedia?

Sharethrough

Sharethrough is an omnichannel supply side platform underpinned by advanced RTB tech and enhanced ad experiences that are proprietary to Sharethrough. Sharethrough aims to bring human-centric technology to programmatic advertising with the goal of creating a sustainable advertising ecosystem for journalists, content creators, and app developers.

Average Rating: 4.5/5.0

Total Reviews: 85

How Do G2 Users Rate Sharethrough?

  • SSP Functionality : 9.1/10 (Category avg: 8.3/10)
  • Impression Targeting: 9.2/10 (Category avg: 8.4/10)
  • Ease of Admin: 8.6/10 (Category avg: 8.4/10)
  • Bid Reporting: 8.7/10 (Category avg: 8.1/10)

Who Is the Company Behind Sharethrough?

  • Seller: Sharethrough
  • Year Founded: 2008
  • HQ Location: Montreal, Quebec
  • Twitter: @sharethrough
    5,075 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    37 employees on LinkedIn®

Who Uses This Product?

  • Top Industries: Marketing and Advertising, Entertainment
  • Company Size: 44% Medium, 28% Small

What Are Recent G2 Reviews of Sharethrough?

What Are G2 Users Discussing About Sharethrough?

OpenX

OpenX’s vision is to unleash the full economic potential of digital media companies through superior advertising technology.

Average Rating: 3.2/5.0

Total Reviews: 18

How Do G2 Users Rate OpenX?

  • SSP Functionality : 6.8/10 (Category avg: 8.3/10)
  • Impression Targeting: 6.8/10 (Category avg: 8.4/10)
  • Ease of Admin: 7.7/10 (Category avg: 8.4/10)
  • Bid Reporting: 6.5/10 (Category avg: 8.1/10)

Who Is the Company Behind OpenX?

  • Seller: OpenX
  • Year Founded: 2007
  • HQ Location: Pasadena, CA
  • Twitter: @OpenX
    17,214 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    520 employees on LinkedIn®

Who Uses This Product?

  • Top Industries: Marketing and Advertising
  • Company Size: 39% Medium, 33% Small

What Are Recent G2 Reviews of OpenX?

PubMatic

PubMatic (Nasdaq: PUBM) delivers superior revenue to publishers by being an SSP of choice for agencies and advertisers. PubMatic’s cloud infrastructure platform for digital advertising empowers independent app developers and publishers to increase monetization while enabling media buyers to drive return on investment by reaching and engaging their target audiences in brand-safe, premium environments across ad formats and devices. Since 2006, PubMatic has been expanding its owned and operated global infrastructure and continues to cultivate programmatic innovation. PubMatic operates 14 offices and eight data centers worldwide.

Average Rating: 3.2/5.0

Total Reviews: 11

How Do G2 Users Rate PubMatic?

  • SSP Functionality : 6.1/10 (Category avg: 8.3/10)
  • Impression Targeting: 5.0/10 (Category avg: 8.4/10)
  • Ease of Admin: 8.0/10 (Category avg: 8.4/10)
  • Bid Reporting: 6.3/10 (Category avg: 8.1/10)

Who Is the Company Behind PubMatic?

  • Seller: PubMatic
  • Year Founded: 2006
  • HQ Location: Redwood City, CA
  • Twitter: @PubMatic
    24,187 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    1,229 employees on LinkedIn®
  • Ownership: NASDAQ: PUBM

Who Uses This Product?

  • Company Size: 36% Medium, 36% Small

What Are Recent G2 Reviews of PubMatic?

Magnite, for Sellers

Seller Cloud is the leading independent advertising marketplace that connects sellers across a global landscape of trusted, high-quality buyers. Maximize yield for your inventory and audiences across all screens and formats, with all of the benefits that automation provides.

Average Rating: 3.2/5.0

Total Reviews: 19

How Do G2 Users Rate Magnite, for Sellers?

  • SSP Functionality : 7.0/10 (Category avg: 8.3/10)
  • Impression Targeting: 6.5/10 (Category avg: 8.4/10)
  • Ease of Admin: 7.7/10 (Category avg: 8.4/10)
  • Bid Reporting: 6.8/10 (Category avg: 8.1/10)

Who Is the Company Behind Magnite, for Sellers?

  • Seller: Magnite
  • Year Founded: 2007
  • HQ Location: Playa Vista, CA
  • Twitter: @magnite
    36,314 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    998 employees on LinkedIn®
  • Ownership: NASDAQ: MGNI

Who Uses This Product?

  • Top Industries: Internet, Marketing and Advertising
  • Company Size: 55% Medium, 30% Large

What Are Recent G2 Reviews of Magnite, for Sellers?

What Are G2 Users Discussing About Magnite, for Sellers?

AdBook

Quite simply, it is the next evolution of revenue management. Faster, more scalable, and even easier to use, AdBook+ brings sales enablement, yield management and workflow automation together in a single platform: a Revenue Management Platform.

Average Rating: 3.7/5.0

Total Reviews: 12

How Do G2 Users Rate AdBook?

  • SSP Functionality : 5.0/10 (Category avg: 8.3/10)
  • Impression Targeting: 7.8/10 (Category avg: 8.4/10)
  • Bid Reporting: 9.4/10 (Category avg: 8.1/10)

Who Is the Company Behind AdBook?

  • Seller: FatTail
  • Year Founded: 2001
  • HQ Location: Calabasas, California
  • Twitter: @fattailinc
    9,094 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    23 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 58% Medium, 25% Large

What Are Recent G2 Reviews of AdBook?

What Are G2 Users Discussing About AdBook?

Genesis SSP

The Genesis SSP powered by Page Intelligence improves the performance of outstream video. The platform tests and selects one of multiple formats on the fly, adapting to how the user is consuming the content.

Average Rating: 3.3/5.0

Total Reviews: 10

How Do G2 Users Rate Genesis SSP?

  • SSP Functionality : 6.7/10 (Category avg: 8.3/10)
  • Impression Targeting: 7.1/10 (Category avg: 8.4/10)
  • Ease of Admin: 9.0/10 (Category avg: 8.4/10)
  • Bid Reporting: 8.3/10 (Category avg: 8.1/10)

Who Is the Company Behind Genesis SSP?

  • Seller: Genesis Media
  • Year Founded: 2010
  • HQ Location: New York, NY
  • Twitter: @GenesisMediaNY
    853 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    33 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 80% Small, 20% Medium

What Are Recent G2 Reviews of Genesis SSP?

360 Polaris

360 Polaris is a revolutionary ad monetisation platform for video, web and mobile publishers. A all-in-one solution for content providers that integrates advanced capabilities and offers unparalleled transparency and control, no matter what their sales strategy.

Average Rating: 4.0/5.0

Total Reviews: 10

How Do G2 Users Rate 360 Polaris?

  • SSP Functionality : 8.0/10 (Category avg: 8.3/10)
  • Impression Targeting: 8.3/10 (Category avg: 8.4/10)
  • Ease of Admin: 6.7/10 (Category avg: 8.4/10)
  • Bid Reporting: 8.6/10 (Category avg: 8.1/10)

Who Is the Company Behind 360 Polaris?

Who Uses This Product?

  • Company Size: 50% Medium, 40% Large

What Are Recent G2 Reviews of 360 Polaris?

What Are G2 Users Discussing About 360 Polaris?

Automatad

Automatad is a digital media products co, that provides a suite of programmatic monetization solutions that drives efficiency and superior monetization at scale. Using our platform digital publishers can create, monetize and optimize for the best ad experience.

Average Rating: 4.5/5.0

Total Reviews: 28

How Do G2 Users Rate Automatad?

  • SSP Functionality : 9.5/10 (Category avg: 8.3/10)
  • Impression Targeting: 9.2/10 (Category avg: 8.4/10)
  • Ease of Admin: 8.7/10 (Category avg: 8.4/10)
  • Bid Reporting: 9.5/10 (Category avg: 8.1/10)

Who Is the Company Behind Automatad?

  • Seller: Automatad
  • Year Founded: 2013
  • HQ Location: New York, US
  • Twitter: @AutomatadX
    293 Twitter followers
  • LinkedIn® Page: www.linkedin.com
    7 employees on LinkedIn®

Who Uses This Product?

  • Company Size: 57% Small, 33% Medium

What Are Recent G2 Reviews of Automatad?

PayTunes

Mobile advertisement platform.

Average Rating: 4.1/5.0

Total Reviews: 35

How Do G2 Users Rate PayTunes?

  • SSP Functionality : 8.6/10 (Category avg: 8.3/10)
  • Impression Targeting: 8.2/10 (Category avg: 8.4/10)
  • Ease of Admin: 8.0/10 (Category avg: 8.4/10)
  • Bid Reporting: 8.2/10 (Category avg: 8.1/10)

Who Is the Company Behind PayTunes?

Who Uses This Product?

  • Top Industries: Marketing and Advertising
  • Company Size: 71% Small, 14% Large

What Are Recent G2 Reviews of PayTunes?

Yukta Rustagi
YR
Researched and written by Yukta Rustagi
Updated October 3, 2024