AI Generates Code.

Name: Quint
Author: Informal Systems

Quint Generates Confidence.

Executable specifications for reliable systems

Software teams are shipping faster than ever. But speed without evidence isn't progress. Quint is the executable spec that turns your system's intended behavior into checkable, verifiable evidence.

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quint — bash

Speed is scaling.
Trust isn't.

90% of developers use AI to write code. Only 24% trust it a lot. The process that used to generate confidence, writing specs, tests, and reviews, is gone. Quint brings it back, without the overhead.

How Quint Works:
The Executable Spec

One Quint spec connects your intent to your code, your tests, and your runtime. A confidence infrastructure from one holistic artifact.

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One Source of Truth. Continued Confidence.

From design to production, Quint Studio makes system behavior the backbone of your software process.

Quint Studio

Capture your intent as executable, high-level system descriptions with verifiable properties. Validate behavior during design, carry it into testing, and surface mismatches in production.

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Quint Language

The Quint language and core tooling are open source. A powerful foundation for writing executable specs, modeling and verifying behaviors, and building Quint into your own tooling.

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Built for Teams Where Correctness Matters

For the systems you can't afford to get wrong.

AI Infrastructure

New hardware or platform that is hard to test? Quint validates your design.

Blockchain / Fintech

Does your protocol store a lot of value? Make your transactions verified transitions.

Cloud Infrastructure

Complex distributed systems where you don’t know what and how to test? Quint checks the worst interleavings.

Know what an edge case is?
Quint is probably for you too.

Trusted in
Production

Quint is a working ecosystem with years of research and real-world use behind it.

Quint is an excellent lightweight approach to formal verification, particularly well suited for systems that are still evolving. It allowed us to reach a high degree of confidence in the correctness and security properties of our systems — and helped surface a surprising number of issues that would otherwise have been difficult to detect.

Denis Firsov,

Input Output Group

Quint’s typed, executable spec language, with clean syntax and TLA+-style semantics, makes modeling complex state machines and invariants like lock-free ring buffer safety genuinely straightforward. The quint-connect crate generates ITF traces I replay against real Rust code, combined with proptest fuzzing to verify that atomic usage and lock-free primitives match the spec under all interleavings.

Debasish Ghosh,

Conviva

Quint has been an invaluable tool for my AI agents to find implementation bugs or specification flaws in distributed systems protocols and implementations. My belief is that a formal language lets the models see the big picture and reason beyond the limits of their current context window. Right now, multiple file and whole system reasoning is still a pain point for models and working with formal tools like Quint is a powerful strategy for producing reliably software.

Zaki Manian,

iqlusion

Quint is by far the most approachable formal specification tool I’ve seen. Using it alongside an agent, we were able to quickly formalize an existing system and find real production bugs on our very first attempt. This allowed us to get a handle on some subtle synchronization logic that had eluded us for months. Consider adding Quint to your toolbox!

Ray Myers,

Chief Architect at OpenHands