Noyau - Introspection app

Problem

Most note-taking tools treat notes as flat text. The app needed to support structured capture, AI-assisted reflection, and semantic retrieval — while remaining fast and functional without a network connection.

Solution

Built a Flutter application with a local-first architecture backed by a Fastify/PostgreSQL API. Vector embeddings via pgvector power semantic search. AI reflection workflows are triggered through the OpenAI API. RevenueCat handles subscription management.

Technical highlights

• Local-first architecture with background synchronisation
• AI reflection workflows using OpenAI completions
• Vector similarity search via pgvector
• Structured note data model
• Subscription management with RevenueCat
• Secure backend API with authentication

Outcome

A functional end-to-end AI-powered mobile application demonstrating local-first design, vector retrieval, and real-world subscription infrastructure.