Antithesis

Antithesis is a deterministic simulation testing platform for finding bugs in complex software before it reaches production. It runs a complete system inside a deterministic hypervisor, injects faults and toxic inputs, explores thousands of scenarios, and when something breaks it hands back a perfect reproduction with root cause analysis. The intent is to compress years of production hardening into minutes of testing. The customers are engineering teams building systems where failure is expensive: capital markets platforms, databases, event streaming systems, blockchains, ledgers and distributed systems generally. Fault injection covers clocks, scheduling, networking and storage. Because every run is deterministic, any bug found can be replayed exactly, and a time travel debugger lets engineers step backward and forward through the failing execution. Antithesis runs in CI, in the development loop, or as an agent skill, and exposes CLIs and APIs for integration. Antithesis does not publish pricing. The site offers a demo booking and a quickstart, and commercial terms are quoted. The platform tests whole systems rather than individual functions, so onboarding involves packaging the system to run under the hypervisor. That effort is the trade for a reproducibility that conventional chaos testing cannot offer.