Introduction
Loggerhead is a Mac app that watches the software you run on your machine. It collects the logs, numbers, and request traces your app produces and shows them in one clear window. Your AI coding tool can read the same data. Nothing leaves your Mac.
How it runs
Section titled “How it runs”Loggerhead is one native Swift app. The OTLP receiver, the DuckDB store, the telemetry-linting engine, the alert engine, and the MCP server all run inside that app. There is no container to start, no runtime to install, and no background service. The app is signed and notarised.
Who it is for
Section titled “Who it is for”- Solo developers who want to see what their app does before they ship it.
- Teams that stage a release and want a full picture before it goes live.
- People who work with an AI coding tool and want it to see real facts, not guesses.
What it is not
Section titled “What it is not”Loggerhead is not a production observability platform. It stores data in DuckDB on one Mac. Use it for local and staging traffic. Keep your production platform for production.