License Compatibility Checker

License Compatibility Checker is a free, open-source engine from esdecode that tells you whether code under one license can be used in a project under another. It is directional, so using A-licensed code in a B project is treated as a different question from the reverse. You can use it as a TypeScript and Node.js library or through a free web interface, with no account.

The checker covers 21 licenses by SPDX identifier, each with structured facts and links to authoritative sources. It is rule-based rather than AI-based, and every rule it triggers has an ID you can look up. It highlights copyleft, attribution, source-disclosure and commercial-use obligations, analyzes projects with multiple licenses, and marks unknown or ambiguous cases for manual review instead of guessing. The library has no runtime dependencies.

License Compatibility Checker gives developers a transparent, explainable first answer to a question that usually needs a lawyer or an expensive compliance tool. It is MIT-licensed. It is a young project, so check its results for important decisions.

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esdecode/license-compatibility-checker

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