Simulithic

Software teams need to verify that every user flow in their app works correctly before shipping, but writing end-to-end tests by hand takes time and requires foresight to anticipate every flow that needs coverage. Teams often miss edge cases because describing every possible user path is impractical. As a result, bugs reach production on the flows that were never tested, breaking the experience for real users on real devices.

Simulithic automatically maps every user flow in an application with a single command, simulithic map, exploring the app without requiring manual test descriptions. It then runs simulithic qa to verify these flows across combinations of real browsers (Safari, Chrome, Firefox), operating systems (macOS, Windows, iOS, Android), screen sizes and network speeds (5G, 4G, 3G, Fast Wi-Fi, Slow Wi-Fi, Ethernet), each in an isolated VM. It integrates into developer workflows in three ways: locally via terminal or through Claude Code and Codex before opening a pull request, in CI/CD pipelines where it comments on pull requests about anything broken, and in production where it continuously re-runs flows on real devices as often as every 30 minutes and alerts teams in Slack if something breaks.