Undo develops time travel debugging software for recording and replaying program executions to aid debugging. Its products include UDB, a reversible debugger for Linux supporting C/C++ and SystemC on x86 and ARM processors, and LiveRecorder, which enables teams to record software runs for replay. The tools also support Rust, Go, Java, and Kotlin, targeting environments such as networking, security, financial services, databases, and large-scale simulations. The company was founded in 2005 by Greg Law and Julian Smith. It raised seed funding in 2012, a $3.3 million Series A in 2016, and a $14 million Series B in 2018 led by Cambridge Innovation Capital. Undo is headquartered in Cambridge, UK, with an office at 22 Station Rd Fl 3.