LanguageTool

Open source

Multilingual grammar and style checker available as open-source software and a hosted service.

by LanguageTool GmbHOfficial site ↗Source code ↗

Pricing: free, subscription
Free tier: true
License: open-source
Open source: Yes

Editorial review

LanguageTool has not yet been editorially reviewed. User reviews and published field data below are unaffected — we say so rather than implying an editorial verdict.

Facts & attributes

Every value carries its evidence state. “—” means unknown — never a silent default (P-02).

Identity · Taxonomy

Tags(open-source;cloud-native): grammar checker, multilingual, paraphrasing, browser add-on, office plugins, proofreading APIVerified

Platform · Deployment

Delivery model(SaaS;self-hosted;desktop;mobile;embedded;managed-cloud;appliance): SaaS, desktopVerification pending
Desktop apps(Windows;macOS;Linux): macOS, WindowsVerified

Pricing · Licensing

Free plan(true/false): trueVerification pending
License model(proprietary;open-source;source-available;dual-license): open-sourceVerified
Pricing model(free;subscription;usage;seat;asset;transaction;revenue-share;perpetual;custom): free, subscriptionVerification pending
Source repository(HTTPS URL): https://github.com/languagetool-org/languagetoolVerified
SPDX license IDs(Apache-2.0;MIT): LGPL-2.1Verified

Features · Product · Fit

Core capabilities(authoring;automation;analytics): Grammar, spelling, punctuation, and style checking across 30+ languages and dialects, More than 20,000 additional Premium checks for style perfection, Unlimited AI-powered sentence paraphrasing, Custom Style Guide rules for consistent wording, Browser add-ons, email add-ons, and office plugins (Google Docs, Word, Apple Pages, LibreOffice), Personal dictionary and productivity statisticsVerification pending

Api · Integrations · Ecosystem

API available(true/false): trueVerification pending

Security · Privacy · Compliance

Regulatory compliance(HIPAA;PCI DSS;FedRAMP;GDPR support): GDPRVerified

Support · Docs · Services

Support channels(email;ticket;chat;phone;community): help centerVerified

Audience · Use · Case

Best for(Neutral editorial summary): Multilingual writers wanting grammar and style checking in 30+ languages across browsers and office appsVerification pending
Company-size fit(individual;SMB;mid-market;enterprise): individual, SMBVerification pending
Primary use cases(build;monitor;automate): Multilingual grammar and spell checking, Sentence paraphrasing, Team style guide enforcement, Proofreading API for software integrationsVerification pending

Vendor · Maintainer

Vendor type(commercial;foundation;community;government;consortium;individual): commercialVerification pending

Also categorized in

Writing Assistance Tools

User reviews

Review policy

No published reviews yet.