1.9/5
Trustpilot rating
55 reviews
Report
Should I Use LanguageTool?
Instantly check grammar, punctuation, and spelling errors with LanguageTool's AI-powered grammar checker. Enhance your writing in over 30 languages with ease.
Worth it
Worth itBuy if you write in multiple languages or want a cheap, open-source Grammarly alternative.
Solid multilingual grammar checker at $4.99/mo; great for non-English writers, but weak Trustpilot and shrinking free tier are catches.
Confidence: Medium
$4.99/mo
Premium price
$59.90 billed yearly
Yes
Free tier
Basic checks only
$3.3M ARR
Est. revenue
2025 estimate (GetLatka)
Value for money
4
Undercuts Grammarly's ~$30/mo significantly
Ease of use
4
Wide integrations praised: browser, LibreOffice, Office
Feature depth
3
30+ languages, paraphrasing; lighter than Grammarly
Support quality
2
1.9/5 Trustpilot suggests unresolved gripes
Security posture
3
Self-hostable open source; some dependency CVEs
Pros
Cons
Gotchas
- highFree browser extension limits keep shrinking; more features now Premium-only⁵
- mediumPremium runs ~$59.90/year; some users say too pricey for individuals
- mediumText is processed in the cloud unless you self-host the open-source server
- lowPremium comes with a 14-day money-back guarantee, not a free trial11
Best for
- Multilingual writers
- Non-native English speakers
- Budget Grammarly switchers
- Open-source/self-host fans
Not for
- English-only power writers wanting deepest style editing
- Free-only users needing full browser extension features
- Privacy-purists unwilling to self-host
- Teams needing vendor security pages and compliance docs
Pricing
Free
$0
- Basic grammar and spell check
- Limited features vs Premium
Premium
$4.99/mo ($59.90/yr)
- Advanced grammar and style detection
- Paraphrasing tool
- Discounted 2-year subscription offered
Security
Open-source core you can self-host; a few dependency CVEs and one brand-abuse incident, no major product breach found.
- Three CVEs in opennlp-tools 1.9.4 dependencyTwo critical and one high severity vulnerabilities in a dependency, disclosed May 4 via the project's GitHub.⁸
- CVE-2007-1939: cross-site scriptingHistorical XSS vulnerability in LanguageTool, dating to 2007 and predating current versions.⁹
- Malware abused the LanguageTool nameThreat actors used the LanguageTool name in a credit-card exfiltration campaign; project investigating. Brand abuse, not a product flaw.10
What users say
Reviewers praise its multilingual accuracy and integrations, while Reddit users grumble that the free tier keeps shrinking and Premium feels expensive.
“Overall, I am satisfied with LanguageTool proofread”
“LanguageTool - Free is Good, Paid is Better, but Expensive”
“LanguageTool ranked high for accuracy”
Alternatives
Compare LanguageTool with each alternative.
Grammarly
Deeper English-only style editing; costs roughly six times more
ProWritingAid
In-depth style reports for long-form English writers
LanguageTool vs ProWritingAidTrinka
Academic and technical English checker; common LT replacement
LanguageTool vs TrinkaHarper
Guess: lightweight, fully local open-source grammar checker
Full analysis
Based on ~30 public sources: reviews (G2, Capterra, Trustpilot, editor roundups), Reddit threads, pricing pages, and CVE databases. Many snippets truncated, so some claims rest on titles only.
Sources
- LanguageTool Review: Pricing, Features, Pros and Conskindlepreneur.comreview
- LanguageTool Review 2025: Multilingual Grammar Checkertechforword.comreview
- Trustpilot reviews of languagetool.orgtrustpilot.comreview
official
- LanguageTool Premium now mandatory for the extensiondiscuss.privacyguides.netnews
- Grammarly vs LanguageTool (XDA Developers)xda-developers.comreview
- LanguageTool revenue estimategetlatka.comnews
- Three CVEs in opennlp-tools dependencygithub.comsecurity
- CVE-2007-1939 detailnvd.nist.govsecurity
- Malware abusing LanguageTool namegithub.comsecurity
- LanguageTool Premium pagelanguagetool.orgofficial
- LanguageTool subscription help articlehelp.languagetool.orgofficial
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