Replay's time travel debugger found over 900 bugs in 40 award-winning AI-built apps
An end to buggy web apps
Replay argues that reliably detecting and fixing every web bug is now possible, and its core technology is a time travel debugger for Chromium and Node.js that records non-deterministic inputs so a session can be replayed deterministically. Its Replay QA tool explores apps, reproduces user sessions, and traces each bug to a root cause with evidence. In a test on 40 promoted apps from tools like Lovable, Replit, and Bolt.new, it surfaced over 900 bugs.
A time travel debugger provides perfect observability: every question about how the app behaved can be answered. With one in hand, agents never need to guess.