Listed alphabetically. A tool is ranked by its reviews once it has 3.
| Tool | Reviews | Lowest paid plan | Free plan | Free trial | Public API | Runs on | Main features |
|---|---|---|---|---|---|---|---|
 AmplitudeThe platform for building self-improving products | ReviewsNone yetWrite one for Amplitude | Lowest paid planSee plans | Free planYes | Free trialNot confirmed | Public APIYes | Runs onNot confirmed | Main features
|
 FullstoryCapture real user behavior and put it to work, so your AI moves faster, and your experience improves. | ReviewsNone yetWrite one for Fullstory | Lowest paid planNot confirmed | Free planYes | Free trialNot confirmed | Public APIYes | Runs on | |
 KissmetricsKissmetrics follows each customer from first click to every payment, with the reports already built. | ReviewsNone yetWrite one for Kissmetrics | Lowest paid plan$99per month, fromGrowth, as of November 11, 2026 | Free planYes | Free trialNot confirmed | Public APIYes | ||
 MixpanelProduct intelligence platform combining analytics, session replay, experiments and feature flags | ReviewsNone yetWrite one for Mixpanel | Lowest paid planSee plans | Free planYes | Free trialNot confirmed | Public APINot confirmed | Runs onWeb | Main features |
 PendoPendo feeds product context to the apps and AI agents you build or buy. | ReviewsNone yetWrite one for Pendo | Lowest paid planNot confirmed | Free planYes | Free trial30 days | Public APIYes | ||
 PostHogTrack usage, retention and feature adoption, connected to recordings, experiments and feature flags | ReviewsNone yetWrite one for PostHog | Lowest paid planNot confirmed | Free planYes | Free trialNot confirmed | Public APIYes | Runs onWeb | |
 StatsigThe modern product development platform | ReviewsNone yetWrite one for Statsig | Lowest paid plan$150per monthPro, as of October 23, 2026 | Free planYes | Free trialNot confirmed | Public APIYes |
From each tool's own website. “Not confirmed” means we couldn't confirm it there, not that the tool doesn't have it. Each tool's page says when its facts were checked.
How this list is made
A tool is listed here only when we've confirmed on its own website that it has a free plan. Tools we couldn't confirm it for are left out, even if they may have it. Vendors can't pay for a place on this list. Add a tool we missed