Building an AI health companion from vision to React Native
Joshua Grant
DIDI is the heart of it: a friendly companion that greets you, asks how you feel, and turns daily check-ins into something you want to come back to.
A tongue scan, a mood log, a streak: small daily signals the app reads and turns into plain-language insights.
Designed in a two-week sprint, then built as a React Native app with the founder in the loop the whole way.
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Posted Aug 26, 2026
From a founder's vision to a working React Native app: DIDI, a friendly companion that turns daily health checks (mood, scans, streaks) into a habit.
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