PostHog bundles what used to be four subscriptions — product analytics, session replay, feature flags, and A/B testing — into one open-source platform with SQL access underneath. Engineers like it because it's built for them: self-hostable, API-first, and priced on usage rather than seats.

The all-in-one bet pays off in workflow: watch a session replay of users hitting a bug, flag the fix to 10% of traffic, and measure the impact — without stitching together Mixpanel, FullStory, and LaunchDarkly. The free tier is famously generous (a million events a month), which is why it's become the default for early-stage startups.

Individual modules are shallower than the best point solutions — replay is no FullStory, experiments are no Optimizely — and usage-based pricing needs monitoring once traffic grows, because event volume can turn a free bill into a real one quietly. But as a single pane for product teams, the integration beats the depth gap for most companies.

🐱 SAGE SAYS

The correct default for a new product in 2026 — you get the whole measurement stack free until you have the revenue to care about bills. Just instrument events thoughtfully from day one; nobody enjoys renaming 400 events later.

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