FullStory vs PostHog

Quote on request

Free tier available

Quote-based annual contracts priced by session volume. Among the more expensive tools in the category.

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

Free plan with limited monthly sessions.

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

Widely used

FullStory · since 2014

Widely used

PostHog · since 2020

• Retroactive analysis is a genuine capability difference, not a marketing angle.
• Excellent search: find the eleven sessions where a specific error occurred in checkout.
• Strong privacy controls with element-level exclusion rules.

• 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.

• Expensive, with opaque quote-based pricing.
• Capturing everything raises data-governance questions that need answering up front.
• Meaningful learning curve to use the search language well.

• 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.

Product and support organisations that need to investigate specific user problems in depth.

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