Grammalecte

Grammalecte is a free, open-source French grammar and typography checker for writers who work in desktop apps or supported browsers. It is a strong fit for French-language editing where local processing and control over correction categories matter more than semantic review or Chrome support.

Overview

Grammalecte focuses on the details that can make French text look careless: punctuation, spacing, typography, repeated words, hyphenation, capitalization, agreement, conjugation, confusions and pleonasms. It also offers OCR error detection, which can help when correcting text produced by optical character recognition. Its scope is useful but deliberately bounded: it does not analyze meaning, can miss errors and may flag correct text.

The checker analyzes writing on the user’s computer, collects no data and transmits no text, according to its FAQ. That makes it a practical option for writers who want French checks without sending their prose to an online service.

Key features

Several suggestion mechanisms and category controls let writers tune what Grammalecte flags. That flexibility can reduce distractions when a particular class of error is not relevant, though the checker’s false positives still call for human judgment.

Three spelling dictionaries cover Classic, the 1990 Reform and All Variants; Classic is the default. A text formatter can correct recurring errors and restructure text, while the conjugator covers about 8,000 verbs. Together, these tools make Grammalecte more than a proofreader for writers who regularly need French spelling and verb references.

Integrations include LibreOffice and OpenOffice extensions, Firefox and Thunderbird add-ons, plus a command-line interface, server and Python package. The Firefox add-on is signed and its code is checked by Mozilla. The Thunderbird add-on is unsigned and may be installed before its code has been checked, although the maker says it sends no information online.

Pricing

Grammalecte is free open-source software under the GPL 3 license. Its Grammalecte plan costs nothing and includes French grammar and typography correction. There is no free trial because the software is already free. No paid tier or usage quota is part of the stated offer, so there is no upgrade required for the core checker.

Platforms

Grammalecte is available as a desktop app for Linux, macOS and Windows, and as an extension. Firefox is supported, as are LibreOffice or OpenOffice and Thunderbird integrations. There is currently no version compatible with Chrome’s new extension API, a significant limitation for writers who rely on Chrome-based workflows.

Who it's for

Choose Grammalecte for French-language writing when you want detailed grammar and typography checks, dictionary variants, verb conjugation and local text processing at no cost. It is less suitable as a sole proofreader for work where meaning and context need to be evaluated, or for users who require Chrome compatibility. For help, Writer users are directed to LibreOffice or OpenOffice forums; Firefox and Thunderbird users can turn to the Mozfr forum.

Pros and cons

• Pros: Free, open-source correction covers a broad set of French grammar and typography issues, with no text transmitted from the user’s computer.
• Pros: Dictionary choices, configurable error categories, a formatter and an extensive conjugator give French writers useful control beyond basic spelling checks.
• Cons: No semantic analysis and no promise of catching every mistake mean it cannot replace careful review of meaning and context.
• Cons: False positives can interrupt editing, and the lack of Chrome’s new extension API support rules it out for some browser workflows.
• Cons: Thunderbird’s add-on is unsigned and may be installed before its code has been checked, unlike the signed Firefox add-on.

Alternatives

For another free, locally processed open-source checker, consider Harper, which supports a wider range of platforms. Choose QuillBot instead if its free plan’s paraphrasing, multiple modes and basic grammar fit your needs. GrammarCheck.ai offers a free plan with 5,000 credits and a 650-word submission limit for writers who prefer a credit-based allowance.

LanguageTool is another freemium grammar checker, with Basic and Premium plans differentiated by per-text character limits. Linguix offers a free plan with grammar and spelling checks, basic AI suggestions, limited paraphrasing, typing shortcuts and a browser extension. Outwrite may suit writers looking for a free option that includes a thesaurus, Google Docs, Microsoft Word and a web app.

Sapling is an alternative with a free plan that includes AI-detector limits and snippets. Scribens gives free users up to 8,000 characters per day, so it may be a better fit when that daily allowance suits the workload. Browse grammar checkers or AI grammar checkers for more options.

Verdict

Grammalecte is an easy recommendation for French writers who want broad, configurable grammar and typography checks, useful language tools and local processing without a subscription. Its main reason to choose it is that combination of French focus and privacy-conscious, free software; its main reason to look elsewhere is the absence of semantic analysis, alongside false positives and no current Chrome extension compatibility.