LanguageTool vs Trinka

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

Trinka

• Researchers and students preparing papers, theses and journal submissions
• Non-native English speakers writing academic or technical text
• People who must keep drafts out of storage and AI training

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.

Trinka

• The free Basic plan stops at 5,000 words of writing assistance and 5 AI writing requests a month.
• Premium Plus and Confidential Data are sold on annual billing only; Premium alone has a monthly price.
• Plagiarism reports on Basic and Premium are paid for with credits: 24 for a standard report, 36 for an advanced one.
• Apps listed are a web editor, browser extensions, Word add-ins and a Windows app in beta; there is no Mac desktop app or mobile app.

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.

Trinka

Grammar and style checks

Checks grammar, technical spelling, tone and sentence structure for formal writing. Paid plans add Power mode and corrections that follow the APA, AMA, ACS, AGU and IEEE style guides.

Proofread File

Edits whole Microsoft Word and LaTeX files with formatting kept. Paid plans return an editable file with tracked changes; the Basic plan gives a read-only result. One credit covers 5,000 words.

Paraphraser and AI writing

Rewrites text in several modes and generates or expands drafts on request. Monthly AI requests are capped at 5 on Basic, 25 on Premium and 1,000 on Premium Plus.

Plagiarism and AI detection

Plagiarism reports cost 24 credits (standard) or 36 credits (advanced), and the AI detector 1 credit per 5,000 words. Premium Plus includes 240 pages a year of standard checks.

Citation tools and Journal Finder

A citation checker flags retracted and unverifiable references, a formatter applies major citation styles, and Journal Finder suggests journals for a manuscript.

Confidential Data plan

A separate plan that deletes processed text in real time, does not use it for AI training and includes an offline grammar checker app.

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.

Trinka

• Basic$0

  5,000 words of writing assistance a month, Lite-mode grammar check, 5 AI writing requests, 4 free credits a month and read-only file proofreading.

• Premium$48

  per year, billed annually; or $20 per month billed monthly

  Full writing features, style guides, 25 AI requests and 10 credits a month. The yearly price is shown with $80 crossed out, a 40% discount with no stated end date.

• Premium Plus$125

  per year, annual billing only

  Adds file translation, 1,000 AI requests and 20 credits a month, and 240 pages a year of standard plagiarism or AI-detection checks.

• Confidential Data$300

  per year, billed annually

  Real-time data deletion, no AI training, an offline grammar checker app and 1,000 pages a year of plagiarism or AI checks. Shown with $500 crossed out.

• EnterpriseCustom

  Quoted plans for teams: user management, usage analytics, feature customization, API, SDK and on-premise options, and white labeling.

• InstitutionCustom

  Writing assistance plus the DocuMark academic integrity tool for universities, with LMS and SSO integration. A no-cost pilot can be requested.

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.

Trinka

• Annual discount

  Save 67% with yearly billing

  The pricing page labels yearly billing as a 67% saving: Premium is $20 a month when billed monthly, against a regular yearly price of $80.

• Education

  Student discounts on request

  Trinka's pricing FAQ says discounts for PhD students are available by contacting its support team. No rate is published.