Undo

Undo is the leader in debugging large-scale Linux codebases. Developers spend far too much time figuring out what code actually does—either to understand other people’s code or to find and fix hard-to-reproduce bugs. So we help developers understand complex code and fix bugs faster. With time travel debugging, thread fuzzing, and agentic debugging, developers can now diagnose the root cause of any bug in hours instead of weeks—customer issues, test failures, flaky tests, multithreading issues etc. No bug remains unresolved. Thousands of developers across leading tech firms including SAP, AMD, Palo Alto Networks, Juniper Networks, or Siemens EDA use Undo to release on schedule, ensure stability at scale, and guarantee customer satisfaction.