H
HReadability editor that flags wordy, unclear writing and offers AI fixes
From $8.33/mo
Grammarly vs LanguageTool
Pricing, features, platforms and who each one suits — side by side.
G
Choose Grammarly if…
- you work on Android
- you're in its core audience: students, professionals
L
Choose LanguageTool if…
- you need an API to build on
- you want open source you can self-host or audit
- you're in its core audience: students, professional writers
Side by side
Feature Grammarly LanguageTool
Pricing modelFreemiumFreemium
Starting price——
Free plan
Free trial
API
Open source
Trains AI on your contentYes, unless you opt outNo
Data retentionSaved documents kept until you delete them or your account—
Security and complianceSOC 2 Type IIGDPR
AI rewrites—
Tone adjustment—
Plagiarism checker—
AI text detection—
Non-English checking
Word/Google Docs add-in
Browser extension
Custom style guide
PlatformsWeb, Windows, macOS, iOS, Android, ChromeWeb, Chrome, Windows, macOS, iOS, API
CategoryGrammar & ProofreadingGrammar & Proofreading
CompanySuperhuman Platform Inc.Learneo, Inc.
Based inUnited StatesUnited States
Founded20092003
Part ofSuperhuman—
Key features
G Grammarly
- Real-time spelling, grammar and clarity checks
- Paragraph and full-sentence rewrites
- Tone suggestions for different audiences
- Reader Reactions predicts how readers respond
- AI Detector and Humanizer agents
- Plagiarism checker and citation generator
- Works in MS Office, Google Docs and browsers
- Enterprise style guides, brand tones and DLP
L LanguageTool
- Grammar, spelling, punctuation and style checking
- AI sentence paraphrasing in several tones
- Support for 30+ languages and dialects
- Browser add-ons for Chrome, Edge, Firefox, Opera, Safari
- Plugins for Google Docs, Word, Pages, LibreOffice
- Personal dictionary and Picky Mode
- Team style guides and shared dictionaries
- Proofreading API with daily call-limit plans
Plans and prices
From each vendor's site. Prices change — confirm before buying.
Grammarly
Free€0
Pro€12/member/mo billed annually (€30 billed monthly)
EnterpriseCustom
LanguageTool
BasicFree
PremiumPrice not shown on page
TeamsPrice not shown on page
BusinessCustom
Strengths and limitations
Grammarly
- Free plan includes grammar checks and 100 AI prompts a month
- Available on desktop, mobile, browser extensions, MS Office and Google Docs
- Pro includes plagiarism and AI-text detection
- Enterprise offers SSO, SCIM, BYOK and data loss prevention
- Pro costs €30 when billed monthly versus €12 billed annually
- Free plan is limited to 100 AI prompts per month
- Enterprise pricing is not published
LanguageTool
- Free Basic plan is available
- Supports 30+ languages and dialects
- Many integrations, including browsers, office suites and email clients
- Source code is published on GitHub
- Free plan is limited to 2,000 characters per text field
- Free plan allows only 3 AI rephrasings per day
- Prices did not display on the pricing pages
- Outlook add-on is still in beta
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Built from each vendor's public website; we haven't tested them hands-on. Editorial policy