OmniPoly at a glance
Checked 15 Oct 2026OmniPoly is a small self-hosted web app (v0.16.0, March 2026) that gives a self-hosted LanguageTool server a browser front end, with a Harper tab, LibreTranslate translation and optional Ollama features. Grammar checks cover whatever languages your LanguageTool server supports. It does nothing on its own: you run and connect the backends yourself, typically with Docker. GPL-3.0. It is a paste-in web page, not a browser extension, and has no AI rewriting of tone or plagiarism check.
RepoQuarry. “OmniPoly.” Checked 15 Oct 2026. https://repoquarry.dev/projects/omnipolyHow much of Grammarly does it replace?
1 of 5 jobs. Web page for checking pasted text against your own LanguageTool server; no in-app checking, AI rewrite or plagiarism check.
For style and clarity suggestions, AI rewriting and tone changes, works in the browser and other apps, plagiarism check, see other Grammarly alternatives. You may also need to build an interface, an API server and hosting yourself.
Facts, with sources
Every answer links to where we found it. We read the documentation; we did not install it.
The most recommended way to start it up is to use Docker.github.com · OmniPoly#how-to-run-with-docker ↗ 1d ago
if an environment variable for a particular system is not provided, the corresponding feature will be automatically hiddengithub.com · OmniPoly#disabling-specific-systems ↗ 1d ago
image: kweg/omnipoly:latestgithub.com · OmniPoly#sample-docker-compose-configuration ↗ 1d ago