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Ranked by how many scanned sites use each. Once we see sites drop PartnerStack, where they go next ranks first.
B2B SaaS partner platform for co-selling, affiliate, influencer and customer referral programs.
Growth is sites that added it minus confirmed removals in the last 90 days.
Google's online advertising platform for Search, YouTube and Performance Max campaigns, seen here through its conversion tag.
Meta's conversion tracking pixel, a JavaScript snippet that records visitor activity for the company formerly named Facebook.
Advertiser conversion tracking tag for LinkedIn campaigns, also used to retarget people who visited the site.
Universal Event Tracking tag that feeds conversion goals and remarketing lists in Microsoft Advertising.
Website conversion pixel for X advertisers, set up as an event source in Events Manager and paired with a Conversion API.
Browser tag that reports site events to TikTok, which advises running it alongside a server-side Events API.
Reddit's conversion tracking pixel for advertisers, set up from the Events Manager in Reddit Ads Manager.
For publishers selling their own ad space, a Google ad server that also pulls in AdSense and exchange demand.
Site tag that ties visitor actions to Pinterest ads, supports verified-merchant status and is installed by the Pinterest for Shopify app.
Free-to-join ad network that fills a publisher's pages with ads from Google's advertisers in return for a revenue share.
Microsoft-owned ad tech platform bought from AT&T, whose buying side stopped taking campaigns in 2026 while its sell side carried on.
Enterprise ad serving platform in Google Marketing Platform, for display and video campaigns across channels.
Retargeting and retail media platform for brands that buy commerce ads and for retailers and marketplaces selling them.
Open-source wrapper for header bidding, free to download and supported by a paid-membership organisation.
Monetisation service from Amazon for publishers, with header bidding on the web and offers for streaming TV and apps.
Demand-side platform for brands and agencies, found on advertisers' sites through a Universal Pixel tag placed on every page.
Content recommendation and performance advertising platform that works with publishers and the advertisers paying them.
Conversion tracking pixel for Snapchat ads that records site actions such as cart additions and purchases.
Sell-side ad platform formed from Rubicon Project and Telaria, with connected TV ad serving through SpringServe.
Programmatic advertising platform that lets experienced marketers buy multi-channel inventory themselves.