The product analytics stack, reviewed

The three platforms do not price the same thing, which makes headline comparisons misleading. PostHog charges per event, at about US$0.00031 per analytics event and US$0.005 per session replay. Mixpanel priced by monthly tracked users and moved to event-based pricing in February 2026. Amplitude prices by monthly tracked users, with a free tier covering 50,000 MTUs.

The free tiers differ in kind as well as size. PostHog's free plan covers 1 million analytics events, 5,000 session replays, 1 million feature flag requests and 1,500 survey responses a month, with unlimited seats and no sales gate on core features, and self-hosting is unlimited. Mixpanel's cloud free tier is the most generous of the three at 20 million events a month, which most products under 10,000 daily active users will never exceed. Sources differ on Mixpanel's post-change allowance, with some reporting 20 million events and others 1 million, so the figure should be checked against Mixpanel's published pricing before it is relied on.

PostHog bundles product analytics with session replay, feature flags, A/B testing, surveys, error tracking and a data warehouse, which is 7 capabilities on one bill. Mixpanel and Amplitude are focused analytics tools. That is the real decision: an all-in-one that replaces three or four vendors, against a specialist that does one thing more deeply.

The 2026 comparisons place PostHog with engineering-led teams below roughly 200 people, on the grounds of value, breadth of bundle and a free tier that is genuinely usable rather than a trial. Mixpanel suits product-manager-led teams that want the lowest learning curve and do not need feature flags or experimentation in the same tool. Amplitude is for enterprise teams with dedicated analysts and real data governance requirements.

Product analytics on this site exists to serve the customer journey map rather than to fill a dashboard. The benchmarks that make a map actionable are published: median LTV to CAC of 3.2 to 1, and CAC payback running from about 11 months below US$5,000 ACV to about 22 months in the US$50,000 to US$100,000 band. A tool that cannot segment by contract size cannot tell you which of those two businesses you are running.