Prebid.js

Dominant open-source standard for header bidding, used by a majority of programmatic publishers globally

Prebid.js is the most widely adopted open-source header bidding solution in the digital advertising ecosystem, maintained by Prebid.org — a non-profit organization governed by industry stakeholders including major publishers, ad tech vendors, and agencies. Originally created by AppNexus in 2015 and later donated to the open-source community, Prebid.js allows publishers to run real-time, simultaneous auctions among multiple demand partners (SSPs, DSPs, ad networks) before calling their primary ad server, dramatically increasing competition and yield for ad inventory. The Prebid suite has expanded well beyond its original JavaScript library to include Prebid Server (a server-side header bidding solution), Prebid Mobile (for iOS and Android apps), and Prebid Video. With over 300 demand adapters and integrations with virtually every major SSP and DSP, Prebid.js has become the de facto standard for header bidding implementation. Its open-source nature means publishers and vendors can contribute adapters, modules, and features, creating a self-reinforcing ecosystem of adoption and innovation. Prebid.org holds a unique position in the AdTech landscape as a neutral, community-governed entity rather than a commercial company. This neutrality is a core competitive advantage — publishers trust it precisely because no single vendor controls it. The organization is supported by membership fees from commercial entities that benefit from the ecosystem, while the software itself remains free. Prebid.js is estimated to be deployed on hundreds of thousands of websites globally, making it one of the most impactful pieces of infrastructure in programmatic advertising.

• 2015Founded