head to head · open source
slate vs LanguageTool
slate has 31,748 GitHub stars, 3,302 forks, 653 open issues and last shipped 5 days ago. LanguageTool has 15,042 stars, 1,581 forks, 2,148 open issues and last shipped yesterday. slate leads on adoption by 111% (31,748 vs 15,042 stars). slate is written in TypeScript under MIT; LanguageTool is written in Java under LGPL-2.1. slate has attracted 10% as many forks as stars, LanguageTool 11%. LanguageTool was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| slate | LanguageTool | |
|---|---|---|
| GitHub stars | ★ 32K | ★ 15K |
| License | MIT | LGPL-2.1 |
| Written in | TypeScript | Java |
| Last push | 2026-09-13 | 2026-09-17 |
| Forks | ⑂ 3.3K | ⑂ 1.6K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick slate if
- You weight community size — 32K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick LanguageTool if
- You want the LanguageTool feature set and don't need the biggest community
- You prefer the LGPL-2.1 license terms
- Your stack matches Java
- You evaluated both and LanguageTool fits your workflow better
About slate
Slate is a completely customizable framework for building rich text editors, written in TypeScript and released under the MIT licence, for JavaScript and React developers who need an editor that goes well past what a fixed schema can offer.
read the full slate overview →
About LanguageTool
LanguageTool is open source proofreading software for English, Spanish, French, German, Portuguese, Polish, Dutch, and more than 20 other languages. Its tagline describes it as an AI powered grammar checker for 30+ languages, while the repository description calls it a style and grammar checker for 25+ languages. The project lives in the natural language processing and productivity ecosystem, where it helps writers, editors, and applications detect errors that a simple spell checker cannot find.
read the full LanguageTool overview →
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Frequently asked questions
Is slate or LanguageTool more popular?
slate has 31,748 GitHub stars and LanguageTool has 15,042. slate has the larger community by that measure.
Are slate and LanguageTool free?
Both are open source. slate is licensed under MIT and LanguageTool under LGPL-2.1. Neither carries a licence fee.
What is the difference between slate and LanguageTool?
slate is written in TypeScript and LanguageTool in Java. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, slate or LanguageTool?
Choose slate if you want the larger community (31,748 stars) or its MIT licence terms. Choose LanguageTool if its feature set, stack or LGPL-2.1 licence fits better. Both are self-hostable.