TextChecker

At a glance

• Editor score
  4.7 / 10
• Pricing
  Free plan
• Best for
  Open-source users choosing their AI provider
• Free plan
  Yes
• Paid from
  Free
• Facts checked
  21 Sep 2026

• Where it wins

  • Real-time and on-demand grammar, spelling, punctuation, and style checks
  • Supports Google Gemini, OpenAI, and Anthropic Claude
  • Stores user-provided API keys locally and includes a personal dictionary

• Where it doesn't

  • Users must provide their own AI-provider API keys
  • Text is sent to the selected AI provider during checks
  • Its browser-extension scope limits platform breadth

Our verdict on TextChecker

TextChecker is a free, open-source browser extension for checking spelling, grammar, punctuation, and writing style. It is designed for people who want AI-assisted writing checks while choosing between Google Gemini, OpenAI, and Anthropic Claude. The extension provides real-time checking, on-demand checks through a keyboard shortcut, inline correction suggestions, a personal dictionary, and writing statistics tracking. Builds are available for Chrome-based browsers and Firefox, while the product is positioned as a browser-focused tool rather than a broader writing application.

The provider choice is a central part of TextChecker. Users can configure Google Gemini, OpenAI, or Anthropic API keys and select the provider used during checks. The extension stores those keys locally, and text is sent directly to the selected AI provider when checking takes place. This approach gives open-source users control over the AI service behind the writing workflow, but it also means the product itself does not cover provider usage charges. Anyone choosing TextChecker should account for the separate API-key requirement and possible provider costs.

Its feature set focuses on everyday browser-based writing assistance rather than a wide platform ecosystem. Real-time checking, keyboard-triggered checks, inline suggestions, style checking, dictionary support, and writing statistics cover the main editing workflow without adding unrelated tools. TextChecker is a good fit for users who value open source, want to choose their AI provider, and primarily write in a supported browser. Users who need a broader platform scope or prefer a service that supplies the AI access itself should choose an alternative.

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TextChecker pricing

TextChecker fact sheet

TextChecker integrations

TextChecker lists 3 integrations on its own site.

• Google Gemini
• OpenAI
• Anthropic Claude

Alternatives to TextChecker

• GrammarlyA broad writing assistant with strong grammar, tone, rewriting, and AI coverage.9.4
• LanguageToolA broad multilingual checker with open-source and self-hosting options.9.2
• Microsoft EditorA strong Microsoft 365 writing assistant with focused platform coverage.9.0

See all TextChecker alternatives →

Featured on iTechGuides

TextChecker is listed in our Grammar Checkers directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Sep 2026

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Last updated 28 Sep 2026 · How we research and update