LanguageTool

AI-based multilingual grammar, style and paraphrasing checker (30+ languages, vendor-stated).

Vendor: LanguageTool

Plans & pricing

Checked 2026-10-27. Confirm prices and terms with the vendor before buying.

Paid monthly entryUSD 24.9 / month

Free planYes

Per-user pricingNot stated

Premium

$24.90/mo monthly-billed (per languagetool.org/premium, 2026-10-27)

Free usage: Some usage renews; other limits also apply.

Free version exists; its limits not confirmed.
free non-AI checking standing, plus 3 AI rephrases per day - a renewable daily AI allowance (mixed).
Daily renewable AI subscope - mixed.

More plan details

Identity from owning pages: languagetool.org says "LanguageTool is an AI-based grammar checker"; /about describes AI-based style/tonality analysis and an AI paraphraser.
A writing checker, not a translator - filed under writing.
Core has been open source since 2003 (vendor-stated).
Platforms: browser extensions for Chrome, Firefox, Edge, Safari (homepage); earlier capture - works without an account in common browsers/word processors; free account needed for Windows/macOS/iOS apps per site FAQ; Android not checked.
'Sentence rephrasing by A.I.
3 per day' on the Basic column; free non-AI checking capped at 2,000 characters per text field; Basic usable without a user account per FAQ.

Pricing source & billing notes

Prices reflect the source and date shown, not a checkout quote. Regional prices, tax and extra usage may change your total.

ai-based

Task tags are taxonomy labels, not a checked or tested feature list.

Sign-in: Optional for basic web checking. Account adds dictionary, statistics and saved texts.
Platforms: Web
API available: Yes. HTTP proofreading API with free limits and paid developer access.
Information based on: Official vendor pages

Product page checked: 2026-10-27. Features above are vendor statements, not a performance rating.