What is Antithesis? How we’re different Problems we solve Security approach Demo Fintech Customer stories Working with Antithesis Contact us Backstory Leadership Careers Brand
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Unfailing trading, payments, transfers, wallets, authorizations, billing, accounting, bookkeeping, budgeting, decisioning, reporting, money movement, audits, ledgers, statements, balances, settlements, reconciliations, chargebacks, 

Code that moves money shouldn’t have bugs. Antithesis ensures the correctness and reliability of critical applications for leading fintech companies, hedge funds, and trading platforms.
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Nikolay Koblov
Nikolay Koblov
EVP of Engineering

At Ramp, we care deeply about reliability, but the most dangerous bugs are the ones we don’t even know to look for. Antithesis helped us uncover high-impact issues in complex code paths that are rarely exercised in production. Unlike unit tests, which validate isolated functions, or E2E tests, which check expected user flows, Antithesis simulates unpredictable failures and rare edge cases across the entire system. This approach allowed us to validate critical system behaviors with a level of confidence that’s hard – and often impossible – to achieve using traditional testing methods.

Clément Salaün
Clément Salaün
Co-founder, CTO

It’s not just the time you spend to find and fix the problem, it’s the fear and uncertainty that really slow you down. The confidence Antithesis creates enables us to move so much faster.

Read the story
Why Antithesis

Antithesis lets fintech innovators and financial institutions do more with the same team

Avoid war rooms
Catch the “unknown unknowns” that lead to ledger mismatches, out-of-sequence transactions, double payments, outages, and other customer-facing issues.
Reduce testing toil
Massively reduce the number of tests you need to write and maintain, and make debugging faster than you thought possible.
Build braver & release faster
Undertake ambitious refactors, migrations, and upgrades with peace of mind. Shorten release cycles and launch new features twice as fast.
What we offer

Antithesis fits seamlessly into your existing development flow

Ensure reliability with property-based testing

Define key system behaviors once. Antithesis validates them continuously, so you don't have to update tests as code changes.
Antithesis test properties

Discover critical bugs
before your users do

Antithesis explores your system autonomously and uncovers complex, rare behaviors humans wouldn't think to test.
Antithesis test run

Discover critical bugs
before your users do

Antithesis explores your system autonomously and uncovers complex, rare behaviors humans wouldn't think to test.

Streamline debugging with detailed artifacts

When a bug happens, Antithesis gives you clear visual diagnostics that show exactly what went wrong and where to look next.

Perfectly reproduce
every bug found

Every failure in Antithesis is perfectly reproducible, thanks to full determinism and state capture. Say goodbye to flaky test reruns.

Perfectly reproduce
every bug found

Every failure in Antithesis is perfectly reproducible, thanks to full determinism and state capture. Say goodbye to flaky test reruns.
Snouty
Antithesis is an
autonomous testing platform
that finds bugs in your software
with perfect reproducibility
to help you fix them.
How it works