Sonar reads any codebase and writes a briefing tailored to your role: what the product does, who uses it, the main workflows, the risks, and what to ask next. Two things make it different: 1. It is grounded, and it proves it. Every claim links to the exact file and line behind it. If the evidence is not there, Sonar says so instead of inventing it. 2. It runs on your machine. Local-first, with a local model or any OpenAI-compatible endpoint you choose. Your code never has to leave your laptop.