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Grammarly vs Trinka AI

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors. Grammarly publishes a starting price ($12); Trinka AI does not. Both have a free tier. Only Trinka AI ships a public API.

GrammarlyGrammar, tone and rewriting help inside every appTrinka AIGrammar and academic-style checker built for research writing, with plagiarism and AI-text detection

Side by side

FactGrammarlyTrinka AI
CategoryGrammar & ProofreadingGrammar & Proofreading
Pricing modelFreemiumFreemium
Starts at$12 month—
Public APINoYes
PlatformsWeb, Chrome Ext, Windows, macOS, iOS, AndroidWeb, Windows, Chrome Ext, API
CompanySuperhumanEnago (Crimson AI)
Launched2009—
Last verifiedSep 6, 2026Sep 6, 2026

What our research says

Grammarly

Still the default for catching mistakes inside other people's software, but the free tier has quietly become an AI-prompt meter and the honest price is $30 unless you commit to a full year.

Pros

  • Runs inside the apps people already write in rather than as a separate editor
  • Free tier still covers spelling, grammar and tone detection with no time limit
  • Pro folds in plagiarism and AI-text detection that rivals charge for separately

Cons

  • The $12 headline is the annual rate; paying monthly costs $30
  • Free AI allowance is 100 prompts a month and depletes quickly
  • No public API, so it cannot be embedded in another product
  • Enterprise pricing is not published anywhere on the site

Trinka AI

For a thesis or a journal submission this beats a general grammar checker, because it corrects toward academic register and subject conventions rather than plain readability. The privacy posture is unusually concrete: a paid tier that deletes text in real time and states no training on your content, with SOC 2, HIPAA, ISO 27001 and GDPR claims behind it. The pricing page is the weak point, listing quotas but not prices for the individual tiers.

Pros

  • Corrections tuned to academic and technical register, including subject-specific usage
  • Plagiarism and AI-content detection bundled rather than sold separately
  • Word add-in, browser extensions, web editor and an offline Windows checker
  • A paid tier that commits to real-time deletion and no training on user text
  • Enterprise API and SDK for integration

Cons

  • Individual plan prices are not printed as figures on the pricing page
  • Quota limits on files, pages and AI requests apply on every tier
  • General-purpose and creative writing is not what it is tuned for

Which one fits

Choose Grammarly if you need

  • Anyone writing in a browser, Word or email who wants corrections in place
  • Teams enforcing a house style guide across people who are not writers
  • Non-native English speakers who want fluency rewrites, not just error flags

Choose Trinka AI if you need

  • researchers preparing journal manuscripts
  • non-native English academic writers
  • institutions needing a confidential-data writing tool

More comparisons

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