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Lean

A formal proof assistant and functional programming language that enables machine-checkable mathematical proofs and integrates AI-driven tools to accelerate automated reasoning and formal verification.

shipped Oct 2, 2026freemium
Domain rating74Monthly visits46K/mo
Lean - AI tool hero image

Why it matters

1ai

About Lean

Business Model
Open Source
Platforms
Web, API
Target Audience
Mathematicians, researchers, and software engineers.
API DocsGitHubOpen Source

Specs

API Available

Yes, public API

overview

Overview

A formal proof assistant and functional programming language that enables machine-checkable mathematical proofs and integrates AI-driven tools to accelerate automated reasoning and formal verification.

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