Undiet
Weight-loss social network · 2026 · Founder, Full-stack
Social where it helps, private where it counts.
Undiet is a social network and tracker for people losing weight: a private journey, an anonymous community of people on the same road, and a diet catalog that shows what actually works, from the people on it. Diet-agnostic, with first-class support for GLP-1 medications.
What Krnic did
A full rewrite as a bare React Native app on a Supabase backend. The journey is modelled as a timeline of diet periods, so one engine tracks a 90-day rotation, a GLP-1 therapy or simply no diet, and turns it into both personal and crowd-level insight on what works.
Two strictly separated worlds sit at the core: a private diary and a public, nickname-only persona, bridged only by an explicit share with a preview. Progress photos live in a biometric-locked vault, are cut out on the device and compared day by day on a private timeline, and never become a before-and-after post. Rewards are for showing up, never for kilograms.
Stack: React Native, TypeScript, Supabase, PostgreSQL, Row-level security, Edge Functions, Reanimated, On-device vision, RevenueCat