Trinka vs Writefull

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

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

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.

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.

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.

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.

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.

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.

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.

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.