Open Source Alternatives to Grammarly

An AI writing assistance platform that checks grammar, spelling, tone, and style while offering rewrite suggestions, plagiarism detection, and AI-generated content prompts.

Whether you want to cut software costs or escape vendor lock-in, these open source alternatives to Grammarly give you an option you fully own. Run them on your own server or desktop, so your data stays under your control. This page lists 2 open source alternatives to Grammarly. The most popular are LanguageTool and Harper. Most use the Apache-2.0 or LGPL-2.1 license, and 2 offer an official Docker image.