GitHub licence checker

Paste a GitHub repo. You'll see its licence, whether you can use it commercially, what attribution you owe, and any copyleft warning, plus whether JustClaw-It already serves licence-cleared components from it.

youngyangyang04/leetcode-master: no licence detected no-license

Source: JustClaw-It's licence policy for this repo (checked against the repo's LICENSE file). Open on GitHub

Commercial use OK?	No. With no licence, all rights are reserved by the author: you may read the code, not copy or ship it. Ask the author for a licence.
Attribution	Not applicable: the licence doesn't allow the use in the first place.
Copyleft	No licence granted at all.
In JustClaw-It?	no We index this repo but don't serve its code, because its licence class is no-license. Only permissive and weak-copyleft code is served.

Licence-cleared alternatives we serve

trekhleb/javascript-algorithms

📝 Algorithms and data structures implemented in JavaScript with explanations and links to further readings

score 8.0/10 · MIT permissive · 196,690 stars · 162 components · search them · alternatives
lorexxar/kunlun-m

KunLun-M — Open-source static code analysis for PHP, Nodejs/JavaScript, Python, Golang, Java and C/C++, with AST-based semantic scanning and one-click AI Agent integration (OpenClaw, Codex, Claude Code, Hermes, and more)

score 6.2/10 · MIT permissive · 2,418 stars · 438 components · search them
grpc/grpc

C++ based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)

score 6.5/10 · Apache-2.0 permissive · 45,399 stars · 2,637 components · search them
thealgorithms/c-plus-plus

Collection of various algorithms in mathematics, machine learning, computer science and physics implemented in C++ for educational purposes.

score 5.4/10 · MIT permissive · 34,788 stars · 369 components · search them
thealgorithms/java

All Algorithms implemented in Java

score 4.7/10 · MIT permissive · 66,469 stars · 822 components · search them · alternatives

This is information, not legal advice. Licences can differ per file or per release; read the repo's LICENSE and NOTICE files before shipping.

Questions

Can I use MIT-licensed code in a commercial product?

Yes. MIT allows commercial and proprietary use. You must keep the copyright and permission notice with the code.

What does copyleft mean for my code?

Strong copyleft (GPL) means distributing a product that includes the code puts the whole product under the GPL. Network copyleft (AGPL) extends that to software you only run as a service. Weak copyleft (MPL, LGPL) limits the obligation to the licensed files or library.

What if a repo has no licence?

Then all rights are reserved by the author. You can read the code, but you may not copy, modify or ship it without permission.

Stop checking licences by hand. JustClaw-It is an MCP server with 1,449,000+ licence-cleared, quality-scored code components. Search is free; every result carries its licence and attribution.

Remote MCP endpoint: https://justclaw.it.com/mcp (API key auth). Works with Claude Code, Cursor, Codex, Windsurf and other MCP clients. A one-line CLI installer (@justclaw-it/cli) is coming.

Get a free API key Read the docs