PostHog

What it is

PostHog is an all-in-one product analytics platform — events and funnels, session replay, feature flags, experiments, surveys and a SQL-queryable data warehouse under one login. For a PM, the AI angle is PostHog AI: an agent that lives inside your project, answers questions in plain English, builds the insight, writes the SQL when the question outgrows the UI, and shows you what it did. The whole thing is open source and self-hostable, and the cloud free tier is large enough that most small products never pay.

Our verdict

The best value in this category by a distance, and unusually good for a PM working without an analyst. The reason isn’t the AI on its own — it’s that one question can travel the whole chain in one tab: ask “where does signup drop off,” get a funnel, then watch three session replays of the exact users who dropped, then ship a feature flag to fix it. Usage-based pricing with no per-seat fee means you can give the whole team access, which quietly matters more than any single feature. PostHog AI writes readable SQL and leaves it visible, so you can check the work.

Where it falls short: usage-based pricing is only cheap while your volume is small — a high-traffic consumer product can run a startling bill from session replay and events, and the cost is much harder to forecast than a flat per-seat plan (set billing limits on day one). The platform is also sprawling and engineer-flavoured: instrumentation, autocapture hygiene and event naming are still your problem, and PostHog AI will happily produce a confident, clean chart from badly named events. The 500 free AI credits a month go quickly once you start exploring.

Get value in 10 minutes

1. Sign up for PostHog Cloud (free, no card) and install the JS snippet, or open the demo project if you’re just evaluating.
2. Open PostHog AI and ask: “Build a funnel from pageview to signup completed for the last 30 days, broken down by referring domain.” Read the definition it picked before you believe the number.
3. Ask the follow-up that only PostHog can answer in the same breath: “Show me session replays of users who dropped out of that funnel at the last step.” Watch three of them end to end.
4. Ask it to “write the SQL for the same funnel” and skim the query — this is the step that catches a wrong event or a double-count.
5. Before you leave, go to billing and set a spend limit. Usage pricing without a cap is how this tool surprises people.