How we built mobile replay (and why it took so long)

PostHog has introduced mobile session replay capabilities for iOS, Android, React Native, and Flutter, overcoming significant technical challenges that delayed its release since the initial web version in 2020. These challenges included the lack of a mobile equivalent to the rrweb library, performance issues due to the limited power of mobile devices, privacy concerns regarding sensitive data, and testing limitations due to the absence of a mobile app for dogfooding. To address these, PostHog developed platform-specific SDKs, optimized performance by focusing on wireframes rather than screenshots, implemented privacy controls for masking sensitive information, and utilized open-source apps and user feedback for thorough testing. The new mobile session replay is designed to be more accessible and affordable, offering a free tier of 2,500 recordings per month to support developers in enhancing their mobile applications.

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