TextChecker

Free plan Extension

What TextChecker is

TextChecker is a free, open-source browser extension for AI-assisted spelling, grammar, punctuation, and style checking. It works with Google Gemini, OpenAI GPT, or Anthropic Claude, using API keys supplied by the user. Checks can run in configurable real time or on demand with Ctrl/Cmd + Shift + G. Errors are underlined, and click-to-fix popovers provide suggestions; a personal dictionary stores words to ignore. The extension also records writing-improvement statistics. It supports English, German, Spanish, French, Portuguese, and other automatically detected languages. Release v1.0.2 adds Google Docs support, with builds and installation instructions for Chrome, Edge, Brave, Arc, and Firefox. The project uses the MIT License and invites pull requests. Its README says keys are kept in Chrome sync storage, text is sent to the selected provider when checking, and no analytics or tracking are used. The extension costs nothing plan, while provider API usage is paid by users.

Who it suits

TextChecker suits people who want an open-source browser extension for multilingual writing checks. It is also suited to users who already have API keys for a supported AI provider.

What it does well

Checks spelling, grammar, punctuation, and style
Supports configurable real-time checking
Provides click-to-fix suggestions
Includes a personal dictionary
Works across five named languages and auto-detected others

What to know first

Users must provide AI API keys
Users pay selected provider API usage
Text is sent to the provider during checks
Listed release is v1.0.2

Plans

Plan	Billed and limits	Price
Free	Free, open-source browser extension; users provide their own AI API keys and pay for API usage	Free

As github.com lists them, read 12 Oct 2026. The maker's own page has the final word.

Verdict

TextChecker offers broad browser coverage and configurable AI writing checks without a charge for the extension itself. Users should account for their own provider costs and the stated data flow when deciding whether it fits.

Facts from TextChecker's own pages

AI providers: It supports Google Gemini, OpenAI GPT, and Anthropic Claude using the user's own API keys. · github.com, 12 Oct 2026
Browser extension: Yes · github.com, 21 Sept 2026
Browsers: The maker provides extension builds and installation instructions for Chrome, Edge, Brave, Arc, and Firefox. · github.com, 12 Oct 2026
Checking modes: Users can enable configurable real-time checking or run checks on demand with Ctrl/Cmd + Shift + G. · github.com, 12 Oct 2026
Checks: It checks spelling, grammar, punctuation, and style. · github.com, 12 Oct 2026
Data flow: The maker says API keys are sent only to the selected AI provider and text is sent there when grammar is checked. · github.com, 12 Oct 2026
Free plan: Yes · github.com, 21 Sept 2026
Integrations: Release v1.0.2 adds support for Google Docs. · github.com, 12 Oct 2026
Languages: It supports English, German, Spanish, French, Portuguese, and other auto-detected languages. · github.com, 12 Oct 2026
License: The project is released under the MIT License and invites contributions via pull request. · github.com, 12 Oct 2026
Privacy: The README says API keys are stored in Chrome sync storage, text is sent to the chosen AI provider only when checking, and the project uses no analytics or tracking. · github.com, 12 Oct 2026
Purpose: TextChecker is a free, open-source alternative to the LanguageTool browser extension for AI-powered grammar, spelling, and style checking. · github.com, 12 Oct 2026
Release: The GitHub releases page lists TextChecker v1.0.2, released February 2. · github.com, 12 Oct 2026
Style suggestions: Yes · github.com, 21 Sept 2026
Suggestions: It underlines errors and offers click-to-fix popovers, plus a personal dictionary for words to ignore. · github.com, 12 Oct 2026
Writing statistics: The extension tracks writing improvements with statistics. · github.com, 12 Oct 2026

Where TextChecker stands on Freedom251

Grammar checkers#50 of 88