Most spaced-repetition apps split reading notes and review cards across two tables and require a 'convert to flashcard' step. FreedWise collapses them: every highlight carries its full FSRS state as columns, a single transaction grades a card and appends to the review log, and fallback scheduling ensures algorithm failures never block a review session.
Most reading apps run separate code paths for EPUB and PDF. FreedWise routes both formats through a single WebView backed by versioned vendor assets on the filesystem. The hard parts: a readiness handshake before sending highlight data, Android tap overlays that break when the viewport zooms, and enforcing an offline-only guarantee at the Content Security Policy level.
FreedWise collapses reading and spaced-repetition review into one offline-first mobile app. You highlight, FSRS schedules it. No account, no sync server, no network — the whole system lives in SQLite on your device. The hardest part was building a single WebView reader that handles both EPUB and PDF across 17 iterations of vendor asset versioning.
A deep dive into the architecture and engineering of a privacy-first mobile mindfulness coach that runs entirely on-device using React Native and Google MediaPipe's on-device LLM capabilities.
