Grammar that stays yours.
Typlx is the open-source, privacy-first grammar checker that works on your device — not on someone else's server.
Most grammar checkers read everything you type and send it to the cloud. Typlx doesn't. Your text is checked locally, stays private by default, and works even when you're offline.
Open-source · No account required · Works offline · Available on iOS and Android
Your grammar checker shouldn't know your secrets.
Every time you use a cloud-based grammar tool, your words — your emails, your contracts, your private messages — travel across the internet to foreign servers. They may be stored, analyzed, or used to train AI models.
Typlx works differently. Grammar checking happens on your device. Your text never leaves your browser unless you explicitly choose cloud features.
This isn't a small privacy upgrade. It's a fundamentally different approach.
Everything you need. Nothing you didn't ask for.
Built different from the start
Privacy-First by Default
Your words stay on your device. Text is processed locally. No cloud uploads, no data brokers, no exceptions — unless you choose to enable optional cloud features.
Works Offline
Grammar checking without an internet connection. Write on a plane, in a basement, or wherever you work best. Typlx doesn't need the internet to catch your mistakes.
Personal Dictionary
Teach Typlx your vocabulary. Add names, technical terms, acronyms, and domain-specific words. Typlx learns what's intentional, so it stops flagging what's correct.
Customizable Rules
Grammar your way. Enable or disable individual rules to match your writing style, industry, or personal preference. Typlx adapts to you, not the other way around.
Open-Source
Nothing to hide. Every line of Typlx code is public and auditable. You don't have to trust us — you can verify us.
Cross-Platform
Write privately everywhere. Browser extensions for Chrome and Firefox. Keyboard apps for iOS and Android. One consistent, private grammar experience across all your devices.
How Typlx compares
See why privacy-first makes a difference
| Feature | Typlx | Grammarly | LanguageTool |
|---|---|---|---|
| Open-source | ✓ | ✗ | Partially |
| Processes text locally by default | ✓ | ✗ | ✗ (self-host only) |
| Works fully offline | ✓ | ✗ | ✗ |
| Personal dictionary | ✓ | ✓ | ✓ |
| No account required | ✓ | ✗ | ✗ |
| Free core features | ✓ | Limited | Limited |
| Chrome extension | ✓ | ✓ | ✓ |
| Firefox extension | ✓ | ✓ | ✓ |
| iOS keyboard | ✓ | ✓ | ✗ |
| Source-verifiable privacy | ✓ | ✗ | ✗ |
Comparison based on publicly available information as of 2026. Self-hosted LanguageTool requires technical setup and server infrastructure.
Privacy isn't a feature. It's the architecture.
We didn't add a "private mode" on top of an existing cloud system. Typlx was designed from the ground up to operate locally. Here's what that means in practice:
No telemetry by default
We don't collect usage analytics unless you opt in.
No text transmission
Your text is processed in your browser using a local grammar engine. It does not travel over the network.
No account required
You can install and use Typlx without creating an account or providing an email address.
Auditable source code
Our code is open-source. Any researcher, journalist, or curious user can verify what Typlx does.
Optional cloud features (for enhanced AI-powered suggestions) are strictly opt-in. You will always be told when cloud processing is used.
Built in the open. For everyone.
Typlx is fully open-source. That means you can inspect the code and verify our privacy claims yourself. You can contribute improvements, new language rules, or bug fixes. You can fork and self-host Typlx for your organization. The project is not dependent on a single company — it belongs to the community.
We believe good tools shouldn't require you to trust a black box.
Get Typlx on every device
One consistent, private grammar experience across all your devices
Chrome / Chromium
Works with Chrome, Brave, Edge, Arc, and all Chromium-based browsers.
Add to ChromeFirefox
Built for Firefox users who take privacy seriously.
Add to FirefoxiOS
Private grammar checking as your iPhone and iPad keyboard.
Download on App StoreAndroid
Android keyboard app in progress. Sign up for early access.
Coming SoonStart writing privately today.
Join thousands of writers who choose to keep their words to themselves. Free to install. Open-source. No account required.