PostHog vs Statsig

Free tier available

Free tier available

Usage-based pricing per product with a substantial free tier; most small teams stay free indefinitely.

One of the most generous free tiers in developer tooling; paid usage is billed on analytics events, not seats.

Large monthly free allowance across every product, plus free self-hosting.

Generous free tier including unlimited feature flags and a large monthly event allowance.

Widely used

PostHog · since 2020

Widely used

Statsig (Amplitude) · since 2020

• Replaces four or five separate subscriptions with one bill and one SDK.
• Free tier is large enough for real production use at startup scale.
• Open source with a credible self-hosting path.

• Statistics engine is genuinely strong — sequential testing and CUPED are not marketing veneer.
• Flags, experiments and analytics in one system removes a whole class of integration work.
• Warehouse-native mode satisfies data-governance requirements.

• Individual modules are less deep than category specialists.
• Self-hosting at scale is a serious infrastructure undertaking.
• The product surface changes fast, which means occasional churn.

• Event-based pricing can escalate sharply on high-volume products.
• Broad surface area means a real learning curve.
• Changed hands twice in under a year — OpenAI acqui-hired the founding team in September 2025, and Amplitude took over the product and brand in May 2026, so the roadmap is still settling.

Startups and scale-ups consolidating analytics, replay and flags into one platform.

Product teams that want experimentation and analytics to share one source of truth.