huginn says:

LanguageTool checks grammar, spelling, and style across many languages via a simple HTTP API you can run privately.

Overview

LanguageTool is an open-source proofreading engine for grammar, spelling, and style in 25+ languages. It offers a simple HTTP API that powers browser add-ons and integrations. For higher accuracy, it can use optional n-gram data and fastText language detection. Ideal as a private alternative to cloud grammar checkers.

Tagged in:

productivity

Features

HTTP API for grammar, spelling, and style checks (/v2 endpoints).
Multi-language support with optional n-gram + fastText enhancements.
Works with browser add-ons and editor integrations; bring your own reverse proxy/TLS.

Website: LanguageTool|Source Code: GitHub Repo|Version: 6.6|License: LGPL-2.1-or-later

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Apps run on a private VPS
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No configuration know-how needed
Access and manage apps privately from any browser
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Apps run in the cloud account you already have
Automated, end-to-end encrypted backup and recovery service not included
Clovyr technical support not included
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