Lexicon at a glance
Checked 15 Oct 2026Lexicon is a young (created July 2026, v0.10.3) desktop rich-text editor that underlines grammar and spelling with a bundled local LanguageTool and offers rewrite, concise and nine tone transforms through a downloaded Qwen3.5 model (0.8B or 2B, ~0.8-1.4GB) run by llama.cpp, or your own Ollama. No account; text stays on your machine. MIT code, Apache-2.0 model. You write inside Lexicon, so it does not check text in other apps; no plagiarism check. Installers are unsigned. Supported languages are not listed.
RepoQuarry. “Lexicon.” Checked 15 Oct 2026. https://repoquarry.dev/projects/lexiconHow much of Grammarly does it replace?
2 of 5 jobs. Offline proofreading and AI tone rewrites inside its own editor; no browser extension or plagiarism check.
For style and clarity suggestions, 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.
Your writing is not sent to any servers.github.com · Lexicon#privacy-and-local-data ↗ 1d ago
Nothing leaves your computer: no account, no cloudgithub.com · Lexicon#privacy-and-local-data ↗ 1d ago
Choose Light for the smaller, faster model (about 0.8 GB), or Standard for the larger model (about 1.4 GB).github.com · Lexicon#first-launch ↗ 1d ago
The macOS build is currently pre-release (unsigned).github.com · Lexicon#download ↗ 1d ago
You do not need Python, Node.js, or Java to use the installed application.github.com · Lexicon#download ↗ 1d ago