An end to buggy web apps

Replay launched Replay QA, a drop-in bug-detection tool built on its time-travel debugger for Chromium and Node.js, which replays recorded runtime behavior deterministically so agents can trace bugs to root cause. In a test across 40 apps promoted by Lovable, Replit, Base44 and Bolt.new, Replay QA surfaced more than 900 bugs, with findings confirmed and deduplicated by Astra. The company argues that perfect observability is the context layer AI coding agents need, since agents that can't see actual app behavior resort to guessing. Replay says QA is not yet perfect and that its own backend is recorded so failures can be debugged and fixed by a software factory. The results position Replay against QA tools such as QA Wolf, which it says identifies broken features like a dead download button in CallVance but does not explain the cause. Watch whether Replay QA's bug and root-cause accuracy holds up beyond contest-winning apps and whether its self-healing recording capabilities scale to broader enterprise use.