Replay.io

Replay.io is a software company based in San Francisco, founded in 2021. It specializes in advanced debugging tools for web applications, offering a deterministic browser and a time-travel debugging platform. This innovative approach allows engineering teams to record, replay, and debug application executions with high accuracy, achieving a 99.9% test pass rate.

The company's flagship product enables users to record and instantly replay application sessions, making it easier to investigate bugs and flaky tests. It also supports retroactive addition of console logs, React component inspection, and network request tracing. Replay.io's tools enhance collaborative debugging for distributed teams, providing a more effective alternative to traditional methods. The company has raised $18.7 million in funding and employs a team of 11-50 people, focusing on improving the debugging process for software engineers across various tech sectors.