Criterion DeepLGrammarly
CategoryAI Writing & Content CreationAI Writing & Content Creation
In one sentenceAn AI translator for text, documents and speech, with a writing assistant and a developer API.An AI writing assistant that checks grammar, tone and clarity wherever you type and can rewrite or generate text on request.
Problem it solvesAccurate translation of business documents and messages is costly and slow when done manually.Everyday writing such as emails, reports and essays often contains errors or unclear phrasing, and checking it manually is slow.
Free planYesYes
Developer APIYes — docsYes
Open sourceNoNo
PlatformsWeb, Windows, macOS, iOS, Android, Browser extension, Microsoft Word, Google Workspace, APIWeb, Browser extension, Windows, macOS, Microsoft Word, Google Docs
Pricing (summary)Translator Free allows 50,000 characters per month. Paid plans billed annually are Individual €7.49/month, Team €24.99/user/month and Business €49.99/user/month (EUR prices incl. VAT as shown for Germany); Enterprise is custom. The API has a free Developer plan (1M characters one-time) and a paid Growth plan.
Checked 2026-10-19		Free plan with basic corrections and 100 AI prompts per month. Pro costs $30 billed monthly, $60 per quarter, or $144 per year ($12/month), per member. Enterprise is priced through sales.
Checked 2026-10-19
Strengths
  • Translation quality and formatting retention
  • Clear data-security commitments on paid plans
  • Mature developer SDKs
  • Works across many apps without copy-pasting
  • Low learning curve
  • Generous free tier for basic correction
Limitations
  • Free Translator limited to 50,000 characters and 1 file per month
  • API Developer allowance does not reset
  • Growth API pricing was not visible on the official page fetched
  • Free plan limited to 100 AI prompts per month
  • Advanced rewriting and plagiarism checks need Pro
  • No public general-purpose writing API (only an audit logs API for Enterprise)