Pernosco

Pernosco is an omniscient debugger. Failures are recorded wherever they happen, locally, in QA, in CI or in production, then debugged from the recording in the Pernosco web interface.

Because the whole execution is recorded, the debugger can show where any value came from and navigate through the program’s history instead of re-running it. Recordings and debugging state can be shared with other developers, which helps analyse intermittent test failures. Recordings are made with rr, the open source record and replay tool that Pernosco sponsors.

Pernosco is a commercial service with a free plan of five uploads for evaluation and paid plans.