Dev Prototyped a 'Second Brain' App on His Phone While Hiking, Apple Approved It First Try
Emojinapp · reddit · 2026-10-19
From Trail Idea to App Store
A developer, frustrated by how messy his AI agents' notes had become, prototyped the app on his phone using GPT Work while hiking. Back home, it compiled on the first try in Xcode with all core features working. After a month of iteration, the iOS version was approved by Apple in a single submission.
Cohestry: A Local-First Second Brain
- Automatically tags, connects and organizes notes, linking old ideas to newer work and resurfacing forgotten ones
- A bridge lets agents pull only the context they need without bloating their context window
- Standout feature: a 3D brain view for bouncing between connected note nodes
- Local-first and fully on Apple APIs — notes never leave the device; Mac app imports Apple Notes, syncs via iCloud, and exposes an MCP server for agents
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