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Francesco Leoni
it

Writing.

Build stories from the apps I design and develop: the product decisions, the architecture and what I learned along the way.

  1. Designing an offline-first sync engine for BrainDump

    How I replaced iCloud sync in my iOS notes app BrainDump with my own offline-first sync on Supabase: versioned compare-and-swap on the server, a 3-way merge on the device, conflict copies instead of lost text, and a randomized simulation that found the bugs.
    • Building BrainDump
    • 8 min read

  2. How Don't Forget's voice input works entirely on device

    How I built voice tasks for my iOS focus timer Don't Forget with Apple Speech and Apple's on-device Foundation Models: no audio or transcripts leave the phone, a rule-based parser as a safety net, and a strict 'never guess the time' policy.
    • Building Don't Forget
    • 6 min read

  3. How I built AI into BrainDump, a notes app for messy thoughts

    How I added AI to my iOS notes app BrainDump: asking questions about your own notes, turning them into summaries, to-do lists or emails, and the streaming, error-handling and usage limits behind it.
    • Building BrainDump
    • 6 min read

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or write to leoni.francesco98@gmail.com