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Never fail again

Web3 code doesn't get do-overs. Antithesis assures the correctness and reliability of critical systems for leading Web3 protocols, DeFi platforms, and core blockchain infrastructure.
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Why Antithesis

Antithesis lets Web3 teams launch faster and safer by finding critical issues before they hit mainnet.

Avoid on-chain failures
Antithesis catches the “unknown unknowns” that lead to validator stalls, chain stalls, contract reverts, timing attacks, bridge failures, consensus failures, and other irreversible bugs.
Antithesis avoid failures
Reduce testing toil
Antithesis massively reduces the number of tests you need to write and maintain, and makes debugging faster than you thought possible. Toil less, build more.
Antithesis testing toil
Build braver & release faster
Refactor node architectures and release new versions with confidence. Shift testing left, tighten feedback loops, and deploy to mainnet faster.
Antithesis release faster
Sam Blackshear
Sam Blackshear
CTO

Software nondeterminism is a significant problem for decentralized systems, and it’s extremely hard to prevent with conventional testing. Mysten Labs leverages Antithesis to identify, reproduce, and fix many impossibly subtle heisenbugs before they reach production. It’s one of our secret weapons in building the safe and reliable software behind Sui, Move, and Walrus. We’re truly grateful to Antithesis – their technology and team are both amazing.

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Danny Ryan
Danny Ryan
Researcher

Antithesis is an exciting and unique tool for debugging blockchains and distributed systems. We used it extensively when testing the Merge. Antithesis was able to deterministically explore and find bugs in very exotic states and scenarios, ones that would have been nearly impossible to hand-code and unlikely to be hit in less stateful, traditional fuzzing.

Read about the Merge
What we offer

Turbocharge your engineering with autonomous testing

Enduring properties, not brittle tests

Define how your blockchain should behave, instead of continually updating tests to try and match your code.
Antithesis test properties

Perfect reproductions, not heisenbugs

Stop wasting time on flaky reproductions. Antithesis offers full determinism and perfect reproducibility of every bug caught.
Antithesis test run

Perfect reproductions, not heisenbugs

Stop wasting time on flaky reproductions. Antithesis offers full determinism and perfect reproducibility of every bug caught.

Detailed artifacts, not more log lines

Unique analytics give you detailed, intuitive, debugging tools to accelerate your fixes and make them stick.
Antithesis bug likelihood

Intelligent exploration, not limited pathways

Antithesis explores massive state spaces efficiently and autonomously, rather than relying on human input or imagination.
Antithesis debugging

Intelligent exploration, not limited pathways

Antithesis explores massive state spaces efficiently and autonomously, rather than relying on human input or imagination.
Snouty
Antithesis is an
autonomous testing platform
that finds bugs in your software
with perfect reproducibility
to help you fix them.
How it works