LanguageTool
Open-source · self-hostable · replaces 1 SaaS tool on os-alt
languagetool-org/languagetool · alive · ★ 14.5k · last commit today · 2115 open issues
License: LGPL-2.1 — Server is LGPL-2.1; the premium 'Picky' rules and the n-gram corpora are paid add-ons even on self-host.
Good fit for Anyone whose Grammarly use is mostly grammar + style + multilingual checking — LanguageTool covers 30+ languages.
Weak at Tone, rewrite, and the AI 'make it sound more confident' features are not in the free OSS server.
In a terminal? npx -y github:SolvoHQ/os-alt-cli grammarly prints
the Grammarly comparison table including LanguageTool.
how the CLI works →
Replaces these SaaS
- Grammarly · Writing assistant / grammar + style checker
Run `docker run -p 8010:8010 erikvl87/languagetool`. Browser extension (LanguageTool's official one) lets you point at your server URL — replaces the Grammarly extension. For Word / Google Docs, LanguageTool ships add-ons that also accept a custom server URL. IDE: the LanguageTool LSP server works inside VSCode / IntelliJ via community plugins.
README badges for the SaaS this replaces
Maintainers and forks: drop a badge in your README to link readers from the SaaS-comparison page back to your repo.
FAQ
Is LanguageTool actively maintained?
Yes — last commit today. The repository is alive (commit activity within the past 90 days).
What does LanguageTool cost to self-host?
LanguageTool is free and open source under LGPL-2.1. Typical self-host VPS cost: $5-10 VPS; the larger n-gram dataset wants ~16GB disk + a few GB RAM if you enable it.
Which SaaS does LanguageTool replace?
LanguageTool is listed as an open-source self-host alternative to: Grammarly.