LET: track your life, discover patterns

What it is

LET (Life Events Tracker) is a simple yet powerful mobile app for tracking daily habits, life events, and discovering patterns in your daily life. Log exercise, meditation, reading, water intake, sleep hours, meals, mood, and important milestones — everything stays in a local SQLite database on your device. No cloud, no account. It runs on iOS, Android, and Web from one React Native + Expo codebase.

Vibe-coded — the confession

The author is refreshingly honest in the README: "I have to be honest with you. I vibe-coded this entire project." The confession goes on: "I didn't write a single line of code manually" — "I just talked to Claude (the AI, not some French guy)" — while mostly drinking tea and approving changes. The author notes this project started as a serious evaluation of whether React Native + Expo could deliver consistent UI across iOS, Android, and Web — and it shipped.

Pattern analysis, offline

The standout feature is the Patterns view: custom SVG charts that surface how your habits correlate over time. Week-based navigation with a calendar picker, dark/light mode, customizable event colors, JSON export/import, swipe gestures — and it all works offline on local SQLite.

Who it's for

Self-quantifiers who want their data on-device; Expo developers looking for a real-world cross-platform reference; and skeptics who need one more proof that a full app can be built by describing it to an AI.