LanguageTool vs Writefull

LanguageTool

• People who write in several languages, not only English
• LibreOffice, Thunderbird and Apple Pages users who want a checker add-on
• Developers who need a proofreading API or a checker they can host themselves

Writefull

• Researchers and students writing papers or theses in English
• LaTeX users who want language checks inside Overleaf
• Departments that want one group license for up to 100 people

LanguageTool

• The free Basic plan checks 2,000 characters per text field and allows 3 AI rephrasings a day.
• There is no free trial of Premium; LanguageTool offers a 14-day money-back guarantee instead.
• Monthly billing is $24.90, more than four times the per-month cost of the annual plan.
• Apps are listed for Windows, macOS and iOS; no Android app appears on the site.

Writefull

• The Free plan has a daily quota on language suggestions and writing features.
• Writefull Revise and Writefull Cite are not part of Premium or Group plans; they need an institutional license.
• Writefull's own language models give feedback on English text only; other languages go through GPT.
• It runs inside Word, Overleaf and a browser. The terms of use state that refunds are not issued.

LanguageTool

Grammar, spelling and style checks

Checks grammar, punctuation, spelling, casing and style. Premium adds more than 20,000 extra checks for English, German, French, Spanish, Dutch, Polish and Portuguese.

AI paraphrasing

Rephrases a sentence to be more formal, more fluid or shorter. Basic accounts get 3 rephrasings a day and Premium removes the limit.

Long-text checking

Premium checks up to 150,000 characters per text field, against 2,000 on the Basic plan.

Style guide and dictionaries

Custom rules enforce consistent wording. Teams share a style guide and a dictionary of approved terms, with admins deciding who can add to them.

Add-ons and apps

Browser add-ons for Chrome, Edge, Firefox, Safari and Opera, plugins for Google Docs, Word, Apple Pages and LibreOffice, email add-ons, and apps for Windows, macOS and iOS.

Open-source core and API

The core checker is open source, with code on GitHub, and users can set up their own LanguageTool server. A hosted Proofreading API accepts up to 60,000 characters per request.

Writefull

Language edits for research writing

Suggests grammar and word-use corrections from Writefull's own models, which are trained on journal articles and cover English only.

GPT edits for other languages

Switching the language check to GPT revises non-English text in Overleaf. Premium adds a custom prompt to steer those edits; Word does not have the switch yet.

Rewriting tools

Paraphrase a passage, make it concise, scientific or punchy, split or join sentences, and get synonyms that fit the sentence.

Title and Abstract Generators

Suggests titles from a selected passage and drafts an abstract from the full text. Both run on Writefull's own models.

LaTeX help in Overleaf

TeXGPT writes LaTeX on request, and the Table and Equation Generators turn a prompt or an uploaded image into LaTeX code.

Ask AI in Word

An assistant inside the Word add-in answers writing questions, either asked freely or about a selected word or passage.

LanguageTool

• Basic$0

  Grammar, punctuation and spelling checks on up to 2,000 characters per text field, with 3 AI sentence rephrasings a day.

• Premium$5.83

  per month, billed annually ($69.90); $24.90 billed monthly

  Up to 150,000 characters per text field, 20,000+ extra checks, unlimited AI paraphrasing and a personal style guide. Also $49.90 a quarter or $119.80 for 2 years.

• Teams$66.40

  per user / year, for a team of 2 users

  Every Premium feature plus user management, a team style guide and a team dictionary. Sold from 2 users, with a lower per-user price for larger teams.

Writefull

• Free$0

  Limited daily use of language edits, rewriting features, TeXGPT, Ask AI and the LaTeX generators. The quota resets the next day.

• Premium$12.50

  per month, billed annually ($150); $17 quarterly; $21 monthly

  Unlimited suggestions and feature use, under a fair use policy, across Writefull for Word, Writefull for Overleaf and Writefull X.

• Group$135

  per additional user / year for seats 2 to 49; first seat $150

  Annual Premium access for 2 to 100 people with an admin portal for inviting members. Seats beyond the 49th cost less, down to $105.

• InstitutionCustom

  Priced on expected student and researcher numbers. Covers all five tools, adding Writefull Revise and Writefull Cite.

LanguageTool

• Annual discount

  Longer billing terms cost less per month

  Premium is $24.90 billed monthly, $49.90 a quarter, $69.90 a year or $119.80 for two years, which works out to about $5.83 and $4.99 a month on the two longest terms.

• Education

  Up to 20% off for students and educators

  Students, teachers and professors can claim an educational discount of up to 20% off a Premium subscription.

• Other savings

  Team seats priced below individual plans

  On Teams, each seat costs less than the $69.90 individual annual price: $66.40 per user for 2 users and $62.91 per user from 10 users.

• Other savings

  Limited-time 20% discount on Premium

  The pricing page was advertising a limited-time 20% discount on Premium, with a countdown, when it was checked on 2026-10-05.

Writefull

• Annual discount

  About 40% less with annual billing

  Premium is $150 billed once a year, equal to $12.50 a month, against $21 billed monthly. Quarterly billing is $51, or $17 a month.

• Education

  15% student discount for recommending Writefull

  Students who email a staff member at their institution about Writefull for Institutions, copying Writefull in, get 15% off a Premium plan.

• Other savings

  Group license discounts for 2 to 100 people

  A group license lowers the yearly price per seat as the group grows, from $150 for the first seat to $135 for seats 2 to 49 and less beyond that.