Gut

What it is

Gut is a longitudinal relationship journal disguised as a simple logging app. You record moments by text or voice; an AI layer (GPT-4o for depth, 4o-mini for scale) classifies each into trust, respect, communication and effort, updates a living relationship score, and detects patterns across weeks and months. It's a genuinely deep codebase (roughly 21,000 lines of Swift across 28 services, with a predictive engine, weekly synthesis and a full widget suite) sitting on a Firebase backend (Auth, Firestore, Cloud Functions) I architected and secured myself, monetized through RevenueCat.