Overlayer AI — Ambient context engine for macOS developers
A native macOS app that continuously captures screen context via Vision OCR, accessibility trees, and clipboard — surfacing contextual hints in a frosted-glass overlay during natural developer pauses. Zero telemetry. Local-first.
- Hybrid search: Apple NLEmbedding (vector) + FTS5 (keyword) + reciprocal rank fusion — all on-device.
- Complexity-routed LLM dispatch: simple → Haiku, complex → Sonnet, privacy-sensitive → local Apple Foundation Models.
- MCP server exposes context to Claude Code and external agents. Swift 5.10 + GRDB SQLite. Apache 2.0.
Swift + Vision framework + NLEmbedding. No Electron, no web shell.
All embeddings and search run on-device. LLM routing by privacy sensitivity.