An Gramadóir

Web · Windows · Mac · Linux · API

Freedom report

Three barsScore 6.5

Free tierA free tier is on its own pricing page
Runs widely4 of 6 device platforms
DocumentedPlans, terms and facts published

An Gramadóir is ranked #55 of 88 in grammar checkers on Freedom251, made by An Gramadóir (Saint Louis University). It runs on API, Linux, macOS, Web, Windows. There is a free plan.

An Gramadóir plans and pricing

All plans

An Gramadóir Free GNU General Public License · individual API requests capped at 16k bytes cadhan.com · 12 Oct 2026

Compared on grammar checkers

Free plan: Yes

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The record

Purpose: An Gramadóir is an open source grammar checking engine, currently implemented for Irish.
Language development: The project is intended as a platform for developing natural language processing tools for languages with limited computational resources.
Checker components: Its Perl module provides separate interfaces for sentence segmentation, spell checking, part-of-speech tagging, and grammar checking.
Command line: The command-line interface reads text from standard input and writes errors to standard output.
Web interface: The Irish grammar checker can be tried through a web interface.
Platforms: The project says it has been tested on Linux, BSD, Sun Solaris, DEC alpha, Mac OS X, and Windows.
Editor integrations: The site describes interfaces for Emacs and Vim, and an OpenOffice macro that no longer works with the latest OpenOffice versions.
LibreOffice integration: The site says An Gramadóir can be used within LibreOffice through an extension released in 2014.
API: The web API accepts HTTP POST requests with Irish text and returns a JSON array of grammatical errors.
API use: The API page says the service powers the Gramadóir web interface, An Scéalaí, and command-line clients.
API limits: Individual API requests are capped at 16k bytes, and the page says no rate limits are currently applied.
API access: The API documentation asks new developers to request a unique client identifier and says requests without an approved identifier may eventually be blocked.
License: The engine is released under the GNU General Public License, which the site says permits copying, modifying, or selling it if redistributed versions preserve those freedoms.
Intended audience: The download page describes installation for users who want the Irish checker and a developers' pack for developers creating language packs.
Price from: Free

Where it ranks on Freedom251

Best Grammar Checkers in 2026#55 of 88

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Sources

cadhan.com/gramadoir/index-en.html· checked 12 Oct 2026
cadhan.com/gramadoir/sios-en.html· checked 12 Oct 2026
github.com/kscanne/gramadoir/blob/master/API.md· checked 12 Oct 2026