LanguageTool vs Grammarly

Comprehensive side-by-side comparison — features, pricing, performance, and more.

Data last refreshed October 2026

LanguageTool

Learneo, Inc.

Your writing assistant for grammar, punctuation, style, and spelling.

Open Source

76% verification coverage

Grammarly

Superhuman Platform Inc.

Free AI Writing Assistance

Freemium

81% verification coverage

Trust & Reliability

LanguageTool

Users:1M-10M

Customers (per vendor):European Union, Spiegel Magazine, Deutsche Presse-Agentur (dpa) +7

GDPR

Grammarly

Users:10M-50M

Customers (per vendor):Databricks, Indeed, Zoom +4

GDPR

SOC 2

HIPAA

Too Close to Call

LanguageTool (7.0) vs Grammarly (6.8) — difference of 0.2 points

Scores are AI-estimated from publicly available data — not an independent test or a verified user rating. How we rank →

AI Comparison Summary

LanguageTool

7.0

avg score

Grammarly

6.8

avg score

Both tools score very similarly overall — the best choice depends on your specific priorities.

Based on 6 dimensions

Scores are AI-estimated from publicly available data — not an independent test or a verified user rating. How we rank →

Too close to call — it's a tie

LanguageTool

Best For

Individuals who want to improve their writing for personal or professional use

Students writing academic papers, bachelor, or master theses

Professional writers seeking advanced grammar, style, and punctuation checks

Businesses and teams needing consistent brand communication and error-free writing

Grammarly

Best For

Individuals seeking mistake-free writing

Teams and businesses aiming for consistent, on-brand communication

Students and institutions needing writing assistance and plagiarism checks

Marketing teams creating clear and convincing content

* Verdict is based on our algorithmic scoring of publicly available data. Learn about our methodology

LanguageTool is best for

🤖Automation & Agents4.5

Grammarly is best for

🤖Automation & Agents5.5🔍Research5.5✍️Writing & Content5.3

Filter by your use case:

Limitations

LanguageTool

Cons

Free plan is capped at 2,000 characters per text field
Free plan offers only 3 sentence paraphrases per day
Free plan provides limited style and tonality suggestions
Team Plan subscriptions cannot be paused
Member accounts within a Team Plan cannot be transferred to a third party
Does not offer a telephone hotline for customer service

Grammarly

Cons

Enterprise features like SSO and data loss prevention are only available on the highest tier
Advanced AI prompts are limited on the Free and Pro plans
Requires explicit permission to record typed or copied input for some features
Grammarly cannot access sensitive fields like passwords and payment information on a best-efforts basis

Weighted Score — Adjust What Matters to You

Pick a profile or drag sliders — scores and radar update instantly on the right.

Quick profiles:

Ease of Use5

Customization5

Support5

Integration5

Compliance & Data Protection5

Performance5

Planning Quality5

Dimension Comparison

LanguageTool

7.0

/ 10

Your pick

Grammarly

6.8

/ 10

Dimension Breakdown

Ease of Use

How intuitive is onboarding, UI navigation, and day-to-day usage for the target audience?

LanguageTool

9.0▲ +1.0

Grammarly

8.0

Customization

Calculated

How much can users tailor workflows, settings, prompts, or outputs to their needs?

LanguageTool

7.0▲ +1.0

Grammarly

6.0

Support

How strong is the documentation, customer support, community, and learning resources?

LanguageTool

7.0▲ +1.0

Grammarly

6.0

Integration

Calculated

How well does it connect with other tools, APIs, and workflows?

LanguageTool

6.0

Grammarly

6.0

Compliance & Data Protection

Calculated

Compliance certifications and data-protection posture, counted from ten verified signals: SOC 2 Type II, GDPR compliance, HIPAA, WCAG AA/AAA, PII redaction, licensed-only training, a published sub-processor list, a downloadable DPA, not training on user data, and a documented deletion path

LanguageTool

5.0

Grammarly

7.0▲ +2.0

Performance

Calculated

Latency + throughput speed

LanguageTool

8.0

Grammarly

8.0

Planning Quality

Calculated

Multi-step planning depth + replanning capability

LanguageTool

—

Grammarly

—

Calculated = derived from structured signals (integration count, API/open-source config, compliance certs, response-time). AI = LLM-assessed from public website content. Methodology

Task Performance

LanguageTool

Task

Grammarly

4.0

Blog Writing

4.0

2.0

Article Generation

4.0

1.0

Seo Optimization

2.0

1.0

Content Research

5.0

2.0

Headline Creation

4.0

2.0

Content Repurposing

6.0

Tone Adaptation

9.0

3.0

Multi Format Output

4.0

6.0

Collaboration Workflow

7.0

1.0

Template Library

5.0

2.0

Text Summarization

6.0

2.0

Language Translation

7.0

* Task scores (1–10) are algorithmically generated from publicly available data.

Data is sourced from public information and vendor websites. It may not always be up-to-date — verify pricing and features directly with the vendor before purchasing.Report inaccuracy

Frequently Asked Questions

What are the main differences between LanguageTool and Grammarly?

LanguageTool — "Your writing assistant for grammar, punctuation, style, and spelling". Grammarly — "Free AI Writing Assistance". The Features section on this page compares them side by side.

Who is LanguageTool best for compared with Grammarly?

LanguageTool is best for Individuals who want to improve their writing for personal or professional use; and for Students writing academic papers, bachelor, or master theses. Grammarly is best for Individuals seeking mistake-free writing; and for Teams and businesses aiming for consistent, on-brand communication.

How does the pricing of LanguageTool compare with Grammarly?

LanguageTool is open source, includes a free plan, paid plans start at $5.83/month. Grammarly is freemium, includes a free plan, paid plans start at $30/month, offers a free trial. Always verify current pricing with the vendor.

Does LanguageTool or Grammarly have a free plan?

LanguageTool is open source. Grammarly has a free plan and offers a free trial. Always verify current pricing with the vendor.

Do LanguageTool and Grammarly offer an API?

LanguageTool offers a public API. Grammarly offers API access on its enterprise plans.

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