PostHog

PostHog is a set of product tools in one platform: product analytics, web analytics, session replay, heatmaps, surveys, feature flags, experiments and A/B testing, error tracking, logs and AI observability, among others.

For usability work, session replay and heatmaps show how users actually interact with an application, surveys collect their feedback, and experiments compare design variants with real traffic. Feature flags allow changes to be rolled out to a subset of users and tested in production, and error tracking links problems to the sessions in which they occurred.

PostHog’s source code is published on GitHub, with the enterprise directory under a separate licence. The cloud service is priced by usage with monthly free tiers for each product.