The Trinka Insider’s Guide
Everything we know about Trinka in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
Trinka
The Insider’s Guide
AI grammar checker and writing assistant for academic writing
Every plan, grade, refund rule and rival among writing tools, read from Trinka’s own pages.
Made by Crimson AI · checked Oct 9, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from Trinka’s own pages, its app-store listings and our grades. Every fact in it is on Trinka’s page too, where it is kept up to date. Checked Oct 9, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
2.8
GPA, above 43 of the 69 other writing tools we grade
Trinka is a grammar checker and writing assistant aimed at academic and technical writing. Alongside grammar, style and consistency checks it proofreads whole Word and LaTeX files, paraphrases, checks and formats citations, and sells plagiarism and AI-detection reports through a credit system. A separate Confidential Data plan deletes processed text in real time and keeps it out of AI training.
To get you started, here are 9 things to know about Trinka, taken from its own pages and our grades.
- 1
Best for grammar checks on academic papers
Trinka is a grammar checker for academic and technical writing that proofreads a whole Word or LaTeX file and returns it with tracked changes.
- 2
Paid plans start at $4 a month when paid by the year
As its pricing page puts it: $48 per year, billed annually (shown with $80 crossed out).
- 3
There is a free plan
Basic plan: 5,000 words of writing assistance a month, grammar check in Lite mode, the standard paraphraser, 5 AI writing requests and 4 free credits a month. It does not expire and needs no card.
- 4
It runs on 2 platforms
Web and Windows, with a browser extension too.
- 5
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.
- 6
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.
- 7
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.
- 8
A 2.8 GPA, above 43 of 69
That is against the other writing tools we grade, on value, the free plan, features, ease of use and platforms.
- 9
Keep it
Nothing Trinka does is plain enough to make in a weekend. The 6 things listed below take a company.
Trinka at a glance
- Pricing
- Free plan, from $48 per year, billed annually (shown with $80 crossed out)
- Free plan
- Yes
- Free trial
- 7-day free trial offered on the Confidential Data plan
- Runs on
- Web, Windows, Browser extension
- Made by
- Crimson AI
- Category
- Writing Tools
- Our grade
- 2.8 GPA, good
The report card
Best for grammar checks on academic papers
Trinka is a grammar checker for academic and technical writing that proofreads a whole Word or LaTeX file and returns it with tracked changes. Premium is $48 a year but $20 a month if you pay monthly, and plagiarism reports cost credits on top. The free plan stops at 5,000 words a month, the dearer plans are annual only, and there's no Mac desktop or phone app.
| Subject | Grade | Comment |
|---|---|---|
| Value for money | B | Premium is $48 a year, which is $4 a month and inside this category's cheapest quarter, shown with $80 crossed out. Don't pay monthly, at $20, and remember plagiarism reports cost credits on top: 24 for a standard report. |
| Free plan and trial | C | Basic never expires and needs no card, but these are caps you'll meet quickly: 5,000 words of writing help a month, grammar checks in Lite mode, 5 AI writing requests and 4 credits. Proofread files come back read-only. |
| Features | B | It covers the whole job: grammar, tone and technical spelling following APA, AMA, ACS, AGU and IEEE style on paid plans, whole Word and LaTeX files proofread with tracked changes, a paraphraser, retracted-reference flags and a Journal Finder for where to submit. |
| Ease of use | B | No store rating on record, so we go on the listing: it works where you already write, in a web editor, browser extensions and Word add-ins, with nothing to set up. The credit system takes a minute, mind: a standard plagiarism report is 24 credits. |
| Platforms and integrations | B | A web editor, browser extensions, Word add-ins and a Windows app in beta, working inside Word, Outlook, Google Docs, Evernote, Medium, Canvas and Moodle, with an API on Enterprise. That list earns the B; there's no Mac desktop app and no mobile app. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
Who Trinka is for
- Fits if you're writing a paper or thesis and want checks that follow academic style
- Works for writers whose first language isn't English and whose text is technical
Who it is not for
- Pricey if you pay monthly, at $20 a month against $48 for the year
- Tight if you're staying free, since Basic stops at 5,000 words and 5 AI writing requests a month, and proofread files are read-only
- Watch out: plagiarism reports on Basic and Premium cost credits, 24 for a standard report and 36 for an advanced one
- Watch out: Premium Plus and Confidential Data are annual only, and the $80 crossed-out price has no stated end date
- Skip it if you want a Mac desktop app or a mobile app, as there's neither, and the Windows app is in beta
Good to know
Good for
- 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
Worth knowing
- 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.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
$4
A month to start, paid by the year. There is a free plan too
Trinka has a free plan. Paid plans start at $48 per year, billed annually (shown with $80 crossed out).
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.
Enterprise
Custom
Quoted plans for teams: user management, usage analytics, feature customization, API, SDK and on-premise options, and white labeling.
Institution
Custom
Writing assistance plus the DocuMark academic integrity tool for universities, with LMS and SSO integration. A no-cost pilot can be requested.
The free plan
Basic plan: 5,000 words of writing assistance a month, grammar check in Lite mode, the standard paraphraser, 5 AI writing requests and 4 free credits a month. It does not expire and needs no card.
Trying it first
7-day free trial offered on the Confidential Data plan
Read from trinka.ai on Oct 9, 2026.
Ways to pay less
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.
Stated on trinka.aiEducation
Student discounts on request
Trinka's pricing FAQ says discounts for PhD students are available by contacting its support team. No rate is published.
Stated on trinka.ai
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
3
Places it runs: Web, Windows and Browser extension
AI grammar checker and writing assistant for academic writing. Here is what it does, as its own site describes it, and what it covers: public API, AI features, citations, grammar & style.
That list earns the B; there's no Mac desktop app and no mobile app.
- 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.
Where it runs
- Web
- Windows
- Browser extension
What it works with
- Microsoft Word
- Outlook
- Google Docs
- Evernote
- Medium
- Authorea
- Canvas
- Moodle
Trinka is made by Crimson AI.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
43/69
Other writing tools it is graded above
Trinka's GPA of 2.8 is higher than 43 of the 69 other writing tools we grade, and level with 13.
It stands best on features (B, above 36 of 69) and worst on free plan and trial (C, above 5).
Its paid plans start at $4 a month when paid by the year, against a middle price of $8 for the category: 5 of the 44 others that charge start lower.
On features, ease of use and platforms it scores 3.0 out of 4. 1 tool scores higher and costs less.
Each grade against the category
Every bar is all 70 writing tools we grade, cut by the letter each got. Trinka’s own letter is outlined.
- BValue for moneyAbove 35 of 69
- CFree plan and trialAbove 5 of 69
- BFeaturesAbove 36 of 69
- BEase of useAbove 32 of 69
- BPlatforms and integrationsAbove 32 of 69
Price against what you get
Each dot is one of 53 writing tools. Further left costs less; higher up scores better on features, ease of use and platforms. Trinka is the marked dot.
What paid plans start at, a month (each step along is roughly double) →
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
Keep it
Nothing Trinka does is plain enough to make in a weekend. The 6 things listed below take a company.
It costs $48 a year.
What you could not
- Grammar checking as you type, wherever you type.
- Citation records for millions of papers.
- A real app for Windows. Something home-made would be a web page.
- It plugs into other products, Microsoft Word, Outlook and Google Docs among them, and has an API.
- AI features, unless you pay a model provider for each request yourself.
- The depth: we grade its features B, which means it covers the whole job.
What this rests on. Trinka’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
Grammarly, Paperpal, Writefull, LanguageTool and ProWritingAid
The 5 tools Trinka is most often weighed against, with where each one differs from it.
- 3.0GPA
Grammarly
Free plan · from $12/mo
Writing assistant for grammar, tone and rewrites in any app.
- Only Grammarly lists macOS, iOS and Android apps.
- Grammarly also covers AI agents and documents.
- 2.6GPA
Paperpal
Free plan · from $12/mo
AI writing and checking assistant for academic papers.
- Only Trinka lists a Windows app.
- Paperpal also covers research.
- 2.2GPA
Writefull
Free plan · from $12.50/mo
Academic language feedback inside Word and Overleaf.
- Only Trinka lists a Windows app.
- Only Trinka lists a browser extension.
- Trinka also covers citations.
- 2.8GPA
LanguageTool
Free plan · from $4.99/mo
Grammar and style checker for more than 30 languages.
- Only LanguageTool lists macOS and iOS apps.
- LanguageTool is open source and self-hostable, according to its own site.
- Trinka also covers citations.
- 2.6GPA
ProWritingAid
Free plan · from $10/mo
Grammar, style and story-critique toolkit for book writers.
- Only ProWritingAid lists a macOS app.
- Trinka also covers citations.
- ProWritingAid also covers long-form writing.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
16
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is Trinka free?
Trinka has a free plan. Basic plan: 5,000 words of writing assistance a month, grammar check in Lite mode, the standard paraphraser, 5 AI writing requests and 4 free credits a month.
How much does Trinka cost?
Trinka lists 6 plans. Basic: $0.
What platforms does Trinka work on?
Trinka is available on Web and Windows. It also has a browser extension.
Does Trinka offer any discounts?
Trinka publicly lists the following: Save 67% with yearly billing; Student discounts on request.
Does Trinka have an Android app?
No Android app was listed when its pages were read on Oct 9, 2026. Trinka is listed for Web and Windows.
Does Trinka have an iPhone app?
No iPhone app was listed when its pages were read on Oct 9, 2026. Trinka is listed for Web and Windows.
Is Trinka open source?
Trinka is not described as open source on its own site, as read on Oct 9, 2026.
Does Trinka have an API?
Yes. Trinka offers a public API, according to its own site.
What does Trinka integrate with?
Trinka's listing names Microsoft Word, Outlook, Google Docs, Evernote, Medium, Authorea, Canvas and Moodle.
Does Trinka have a student discount?
Student discounts on request. Trinka's pricing FAQ says discounts for PhD students are available by contacting its support team.
Does Trinka have a free trial?
Yes. 7-day free trial offered on the Confidential Data plan.
Who makes Trinka?
Trinka is made by Crimson AI.
What are the alternatives to Trinka?
The closest alternatives to Trinka in our directory are Grammarly, Paperpal, Writefull, LanguageTool and ProWritingAid.
How does Trinka compare with other writing tools?
Trinka's GPA of 2.8 is higher than 43 of the 69 other writing tools we grade, and level with 13.
Is Trinka good value for money?
ToolGPA grades Trinka B for value for money. Its paid plans start at $4 a month when paid by the year, against a middle price of $8 for the category: 5 of the 44 others that charge start lower.
Could I make my own version of Trinka?
Nothing Trinka does is plain enough to make in a weekend. The 6 things listed below take a company.
Where this guide comes from
The prices, plans, platforms and features were read from Trinka’s own pages on Oct 9, 2026, and the grades were given on Oct 10, 2026. Graded from this listing, whose facts were read from Trinka's own pages on 9 October 2026. Also tested with a demo account on 2026-09-11.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by Crimson AI. Prices change, so check trinka.ai before you buy.
- trinka.ai/pricing
- payments-api.trinka.ai/api/v1/payment/get/plans/JTdCJTIydXNlcklkJTIyJTNBJTIyJTIyJTJDJTIycGxhblR5cGUlMjIlM0ElMjJwcmVtaXVtJTIwcGx1cyUyMiUyQyUyMmlzQW5udWFsUGxhbiUyMiUzQTAlMkMlMjJnb190b19wYXltZW50cyUyMiUzQXRydWUlMkMlMjJmcm1rdGclMjIlM0F0cnVlJTdE/1/true/US/false
- trinka.ai/
- trinka.ai/features
- trinka.ai/features/credits
- trinka.ai/windows-desktop-app
- trinka.ai/browser-plugin
- trinka.ai/enterprise/grammar-checker-api
- trinka.ai/enterprise/confidential-data-plan-for-grammar-checker
- trinka.ai/aboutus
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
3,189
Tools graded, in 94 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
3,189
tools graded
94
categories
426
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- Trinka, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/trinka
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "Trinka: The Insider's Guide", checked Oct 9, 2026. https://toolgpa.com/tools/trinka
Know someone choosing between writing tools?
Send them this guide: toolgpa.com/tools/trinka/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded writing tools after Trinka, each with an Insider's Guide of its own.
- Writing Tools Insider's GuideEvery one of the 70 writing tools we grade, compared
- Microsoft Word Insider's GuideWord processor sold with Microsoft 365, free in the browser3.4 GPA
- Beat Insider's GuideFree, open-source Fountain screenwriting app for Mac and iOS3.2 GPA
- JotterPad Insider's GuideMarkdown and Fountain editor for books, papers and screenplays3.2 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what Trinka’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Trinka is a trademark of its owner, and this guide is not made, paid for or approved by Crimson AI. Prices and plans change: check trinka.ai before you buy.