LanguageTool Integration for Obsidian Clemens-E/obsidian-languagetool-plugin

Obsidian plugin that underlines grammar and spelling issues using the public LanguageTool API, LanguageTool Premium or your own server.

Creator kit + Compare GitHub ↗ Install guide (official) ↗

LanguageTool Integration for Obsidian at a glance

Checked 15 Oct 2026

This community Obsidian plugin checks notes with LanguageTool as you type or on demand, underlines mistakes and offers up to three fixes per issue. Languages are whatever LanguageTool supports (25+). It is only a client: by default it sends text to LanguageTool's cloud; to keep notes private you point it at your own LanguageTool server, for example the erikvl87/languagetool Docker image. AGPL-3.0. Works only inside Obsidian (desktop and mobile); no AI rewriting or plagiarism check.

Cite this page

RepoQuarry. “LanguageTool Integration for Obsidian.” Checked 15 Oct 2026. https://repoquarry.dev/projects/obsidian-languagetool

How much of Grammarly does it replace?

1 of 5 jobs. Grammar and spelling inside Obsidian notes via LanguageTool; private only with a self-hosted server.

Grammar and spelling checks Partial replacement

Style and clarity suggestions Not covered

AI rewriting and tone changes Not covered

Works in the browser and other apps Not covered

Plagiarism check Not covered

For style and clarity suggestions, AI rewriting and tone changes, works in the browser and other apps, plagiarism check, see other Grammarly alternatives. You may also need to build an interface, an API server and hosting yourself.

Facts, with sources

Every answer links to where we found it. We read the documentation; we did not install it.

Report a correction

QuestionAnswerSourceChecked

Runs on my machine? Plugin runs in Obsidian; checks go to LanguageTool's cloud unless you set a self-hosted server URL If you do not want your notes to leave your machine, run your own LanguageTool server and point the plugin at it with the Custom URL endpoint. github.com · obsidian-languagetool-plugin#privacy-and-self-hosting ↗ 1d ago

Code licence AGPL-3.0 (strong copyleft) github.com · LICENSE.md ↗ 1d ago

Model weights licence No separate model weights github.com · obsidian-languagetool-plugin#readme ↗ 1d ago

Commercial use Yes, AGPL-3.0 conditions apply if you modify and distribute or host it github.com · LICENSE.md ↗ 1d ago

Paid services needed? None required (free public API or self-hosted server); LanguageTool Premium API is optional The plugin works with the free public LanguageTool API, with LanguageTool Premium, and with self-hosted servers github.com · obsidian-languagetool-plugin#readme ↗ 1d ago

Hardware Not documented; a self-hosted LanguageTool server has its own needs Know the answer? —

Operating systems Wherever Obsidian runs, desktop and mobile the left sidebar on desktop, the drawer on mobile github.com · obsidian-languagetool-plugin#the-ribbon-icon ↗ 1d ago

Setup effort Easy from Obsidian's Community plugins; medium if you also self-host LanguageTool with Docker Click Browse, search for "LanguageTool Integration", and click Install. github.com · obsidian-languagetool-plugin#installation ↗ 1d ago