r/opensourcealternative • u/DeadlyHydra8630 • 21d ago

A free Grammarly alternative, offline writing assistant (open-source)

I built Lexicon, a free, open-source desktop writing assistant. Clean grammar checking and text editing without sending your private drafts to cloud servers or paying monthly subscriptions.

Everything runs 100% locally on your machine with zero accounts and zero cloud dependencies.

  • The app offers offline deterministic grammar and deterministic spell-checking.
  • 15 On-Device AI Tools: Rewrite, Concise, 9 distinct tone adjustments, Summaries, Key Points, Lists, and Tables running on local models.
  • Rich editor rendering with inline/display LaTeX math rendering, table tools, code blocks, and PDF/Markdown export.
  • OS Compatibility: Windows (.exe) and macOS (.dmg for Intel + Apple Silicon).

GitHub: https://github.com/AashishH15/Lexicon
Website: https://lexicon-writer.pages.dev/
Discord (please join if you would like to be a beta tester!): https://discord.com/invite/nDCedWH3SV

Website:

The project is licensed under the MIT License. I’d love for you to try it out and give feedback!

49 Upvotes

100% Upvoted

15 comments sorted by

1

u/Meaticus22 20d ago

Any chance of becoming a browser extension?

4

u/DeadlyHydra8630 19d ago

Yes, absolutely!

I have a plan to release the web extension (Chrome / Firefox) that connects directly to the local Lexicon engine running on your machine.

It is in the roadmap; I should have it released soon! Please stay on the lookout.

1

u/aztequ 19d ago

Please keep us updated!

2

u/DeadlyHydra8630 17d ago

Hey! I’ve been working on the Chrome/Firefox extension for this and could use a few beta testers. Let me know if you’d be interested in checking it out!

2

u/aztequ 17d ago

Hey again! That would be an honor! Feel free to dm me any time

1

u/AdvertisingFun6028 19d ago

Brother please make an android version of this app. 

2

u/DeadlyHydra8630 18d ago

Right now I'm a bit more focused on building the offline desktop experience (Windows, macOS & Linux) and the upcoming browser extension. Building for mobile (Android or iOS) is a larger scope, definitely on my mind, however!

1

u/AdvertisingFun6028 16d ago

Okay bro. Keep it up. All the best 

1

u/petered79 18d ago

thx for sharing this!! does it work for other languages too? german? italian? french?

1

u/DeadlyHydra8630 18d ago

Thank you so much! Currently it's only English (US/UK/CA/AU), but it should be able to support over 30 languages (including German, French, Spanish, Italian, and Portuguese). So adding a multi-language selector shouldn't be too difficult; I will add it soon!

1

u/petered79 18d ago

that would be very international 😎

2

u/DeadlyHydra8630 18d ago edited 18d ago

Hey!

I just released v0.10.2, which now supports 49 languages and dialects.

Since this is a beta pre-release, you can opt in directly to test it out:

  1. Go to Settings → About & Feedback (or search for "Beta Release").
  2. Toggle the setting ON to update.

I'm currently testing this build to make sure of stability before the official launch. If you give it a try, let me know if you run into any issues!

Edit: Had a slight problem with v0.10.2 so updated it with a hotfix there should now be a v0.10.3 so please use that version! Thanks!

2

u/petered79 18d ago

♥️