Flux records API executions so you can replay failures locally, fix them, and resume execution safely. Instead of guessing from logs, you get the exact request, inputs, and behavior. Same request. Same IO. Same outcome.
Flux replays bugs locally, but you can stack it with: Sentry for real-time error monitoring, Postman for API debugging, Zipy for AI session replays, Requestly for HTTP rules/mocks, and Clobbr for lightweight load tests.