Release with confidence
Bug-free systems,
unlimited velocity:
Compress years of production hardening into minutes — in CI, in your development loop, or as an agent skill — so you can merge fearlessly.
Trusted by engineering teams building mission-critical systems
40x
Faster change verification
75+
Severe bugs found that all other testing missed
10x
Faster time-to-release with fewer critical failures
what is antithesis
As AI drives down the cost of producing code, the pressure to ship faster rises — but the time required to review, test, and trust each change hasn’t budged. Verification is the new bottleneck.
Antithesis compresses years of production hardening into a few minutes, fast enough to run in CI, in the local development loop, or as an agent skill. Our deterministic simulation platform runs your complete system, stresses it with faults and toxic inputs, finds the bugs you didn’t anticipate, and enriches every bug report with a root cause analysis and a perfect reproduction — so every engineer can merge fearlessly.
why antithesis
Unleash your team
Antithesis catches unforeseen bugs in minutes, so humans and agents can ship quickly without risking outages.
Prevent outages
By injecting realistic faults and leveraging our simulator’s unique replay capabilities, we explore the execution paths that even years of traditional testing miss.
Skip debugging
Our simulator is 100% deterministic and automatically root causes every bug. Rather than wasting time and tokens chasing flaky heisenbugs, your team can jump straight to a fix.
Ship faster
When every pull request has already survived the Antithesis gauntlet, your team can merge big changes confidently — even when they’re authored by agents.
the antithesis platform
Autonomous verification,
not just automated review
Perfect determinism
Deterministic simulation testing goes beyond chaos testing, static analysis, and AI code review: from hypervisor to debugger, our whole stack is designed to efficiently verify your running system.
The foundation of our platform is a custom hypervisor that lets us rewind time, try alternate execution paths, and perfectly reproduce every bug.
Aggressive fault injection
We simulate clock, scheduling, network,
and storage faults to
exercise all your
error-handling code.
Intelligent exploration
Antithesis guides exploration to maximize efficiency, running thousands of distinct scenarios in minutes.
Debugging superpowers
Perfect reproductions, automated root cause analysis, and a time-traveling debugger save time and tokens.
Skills, CLIs, and APIs
Our skills help agents onboard your project, build a specification of its behavior, and call Antithesis in the loop.
What would otherwise take six months of testing in production, running the software -- we can get that in an hour.
Clément Salaün
Co-Founder & CTO, Formance
Watch
The way Antithesis tests whole-system scenarios that we either wouldn’t have thought to test is its own kind of magic… we feel like we can tackle more ambitious projects by relying on Antithesis to fill in any gaps along the way.
Doug Patti
Software Engineer, Jane Street
3x
Engineering output
Antithesis helped us find three key bugs in Tigris… These are the bugs that CI can't cover because no one thinks to write tests for them.
Adil Ansari
Founding Engineer, Tigris Data
Watch
Honestly pretty impressed by this one. I basically dropped the Antithesis logs into Claude and had it debug + fix it end-to-end. Exactly what I want Antithesis to enable us to do.
Philippe Noël
Co-founder & CEO, ParadeDB
6hrs
in Antithesis covers more cases than 100 engineers
Antithesis’s deterministic simulation and active exploration removes the blindfold, enabling a systematic and reproducible search for bugs.
Marek Siarkowicz
Kubernetes & etcd Maintainer
There’s been a transformation in the engineering group. With basically the same group of people, output is now significantly better. Antithesis has given us more confidence in what we’re delivering, lower stress development, more predictability… I look at Antithesis as a way of enabling us to scale, and that is just an enormous deal.
Sean Murphy
Co-Founder & CEO, PingThings
Watch
1 day
Compressed 3 weeks of debugging into one day
With Antithesis, you can make these pretty bold changes that ordinarily you would have to approach so carefully in order to do safely, and you can just kind of write the thing.
Mark Logan
Tech Lead for Sui Core at Mysten
industry solutions
Built for software that can't fail
Ron Minsky Head of Technology
Battle-tested trading infrastructure
Market-making systems depend on in-order message delivery, perfect state machine replication, and extreme availability — even during cluster upgrades, load spikes, and production chaos. At Jane Street, Antithesis took a critical message bus “from tested to battle-tested” and “increased the ambition” of the engineering team.
Watch Ron's interviewBreaking the WAL
I did this from a lawn chair on the Sunshine Coast.
Finding bugs in Raft implementations
Why formal verification is not enough to maintain consensus in real systems
Bug Bash is coming to Europe!
A one day conference — Sept 30th in Copenhagen
My quest to see all of Tetris
We're just trying to keep up with the teenagers.
get started
Velocity and verification. Finally, both.
Talk with one of our product experts to see how Antithesis can help you ship confidently, no matter who’s writing your code.