PostHog
PostHog is built by PostHog Inc. (Y Combinator W20), which raised a $75M Series E in September 2025 at a $1.4B valuation; independent analyst estimates (Sacra) put ARR around $57.5M by February 2026, up ~99% year-over-year — PostHog itself doesn't publicly disclose revenue figures. Product analytics, session replay, feature flags, experiments, surveys and a ClickHouse-backed data warehouse ship as one SDK rather than separate tools. Core code is MIT-licensed and self-hostable via Docker Compose; enterprise-only features (SSO, RBAC, advanced permissions) sit under a separate proprietary license in the repo's ee/ directory. Cloud pricing is usage-based: free tier gives 1M analytics events, 5K session replays, 1M feature-flag requests and 1,500 survey responses monthly, then pay-as-you-go from $0.00005/event down to $0.0000090 at 250M+ events. Over 176,000 companies had signed up as of PostHog's June 2025 Series D announcement. Current version/status: Cloud: continuous deploy (July 2026); self-hosted open-source distribution (github.com/PostHog/posthog) is MIT-licensed with no pinned version number. Note: "PostHog Code" is a separate PostHog product (an AI desktop coding agent) unrelated to self-hosting the analytics platform.. License: MIT (core, self-hosted via github.com/PostHog/posthog); enterprise features (ee/ directory: SSO, RBAC, advanced perms) under a separate proprietar
Pick PostHog when one engineer needs to own analytics, replay, flags and experiments without stitching together four vendors and four invoices — its free tier (1M events, 5K replays, 1M flag requests bundled) beats Mixpanel, which free-tiers flags as a paid add-on. Skip it if you're a PM-led team that just wants clean funnels with zero setup and don't care about flags: Mixpanel's simpler UI wins, and Amplitude's free tier is more generous on raw events (2M) and replays (10K). PostHog's own docs concede self-hosting isn't officially supported at production scale — "open source" is a funnel into Cloud, not a real self-host strategy. Known weakness: PostHog's own documentation states self-hosted open-source deployments are provided without guarantee and aren't officially supported at production scale — the company steers real usage to paid Cloud.
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