Undo (company) explained

Undo is a software debugging company based in Cambridge, UK. The company was founded in 2005 by Greg Law and Julian Smith. Undo’s time travel debugging technology is used by software engineering teams to debug software programs.^{[1] [2]}

Undo’s software is used in environments including networking & security, financial services, databases, and large-scale simulation systems.

History

Undo was initially bootstrapped in 2005^[3] by Greg Law and Julian Smith out of Law’s garden shed in Cambridge.^[4] Law and Smith developed the core technology that would eventually become UDB (formerly UndoDB), a reversible debugger for Linux software.^{[5] [6] [7]}

LiveRecorder was then developed based on UndoDB to enable development teams to record and replay the execution of software programs.^{[8] [9] [10] [11]}

In 2012, Undo secured its initial seed funding. It closed a $3.3 million Series A funding round in 2016, and a $14 million Series B in 2018.^[12]

Products

Undo's tools support x86 processors and ARM.^[13]

• UDB (formerly UndoDB): Interactive time travel debugging tool for individual developers (supports C/C ++ and SystemC)
• Undo: Time travel debugging for teams – for debugging in development or production (supports C/C++, SystemC, Rust, Go, Java and Kotlin)

Agentic debugging

Undo integrated its time travel debugging technology with AI coding assistants, such as Claude Code or GitHub Copilot, enabling those assistants to leverage time travel debugging.^[14]

Notes and References

1. Web site: Heusser . Matthew . 2020-07-28 . Undo enables full Java app failure playback with LiveRecorder . 2022-05-18 . TechRepublic . en-US.
2. Web site: Says . Colin_walls . 2019-04-10 . The Debug Time Machine . 2022-05-18 . EEJournal . en-US.
3. Web site: Undo gets $14M to scale to meet the software accountability challenge . 2022-05-18 . TechCrunch . en-US.
4. Web site: Patient capital from CIC gives ‘time travelling’ company Undo space to pivot Business Weekly Technology News Business news Cambridge and the East of England . 2022-05-18 . www.businessweekly.co.uk.
5. Web site: 2013-01-25 . Research by Cambridge MBAs for tech firm Undo finds software bugs cost the industry $316 billion a year - News & insight . 2022-05-18 . Cambridge Judge Business School . en-GB.
6. Web site: EDN . 2013-12-31 . Reversible debugger adds support for ARM and Android . 2022-05-18 . EDN . en-US.
7. Web site: 2015-01-28 . Undo Your Mistakes at the Customer’s Site . 2022-05-18 . EEJournal . en-US.
8. Web site: 2020-06-12 . Undo adds support for Java in LiveRecorder . 2022-05-18 . SD Times . en-US.
9. Web site: Henry-Stocker . Sandra . 2019-06-28 . Undo releases Live Recorder 5.0 for Linux debugging . 2022-05-18 . Network World . en.
10. Web site: Greg Law on Debugging, Record & Replay of Data, and Hyper-Observability . 2022-05-18 . InfoQ . en.
11. Web site: 2016-08-17 . TestPlant and Undo team up on Continuous Integration testing . 2022-05-18 . SD Times . en-US.
12. Web site: Gooding . Matt . 2018-07-17 . Undo raises $14m to scale globally . 2022-05-18 . CambridgeshireLive . en.
13. Web site: Ltd . Arm . Undo . 2025-10-07 . Arm The Architecture for the Digital World . en.
14. Web site: On Debugging with AI. Interview with Mark Williamson ODBMS Industry Watch . 2025-10-07 . en-US.