Private by design
Your text stays on your machine. Not "we promise not to look"—it physically cannot leave. All AI processing happens locally via WebGPU.
Your writing assistant that never phones home.
AI proofreading powered by Google's Gemma model—runs entirely on your computer. No subscriptions. No cloud. No data collection.
$9.99 once. Yours forever.
Why Syntaxis?
Live corrections
Suggestions appear as you type. No server round-trips, no waiting. Just immediate feedback with a subtle delay so it doesn't interrupt your flow.
Works everywhere
Gmail, Google Docs, social media, web forms—anywhere you write in Chrome. Right-click any selected text to proofread or rewrite.
Simple pricing
$9.99 once, yours forever. Or $1/month if you prefer flexibility. 14-day free trial, no credit card required.
How it works
Before you install
Syntaxis runs a compact AI model on your machine. That means a few trade-offs worth knowing about:
You'll need a capable computer
4GB+ RAM and a GPU with WebGPU support (most machines from 2020 onward). Chrome 121 or newer required. The model takes about 10 seconds to load initially.
Smart, not omniscient
The on-device model is excellent for grammar, spelling, and awkward phrasing. It won't match larger cloud models for complex rewrites or highly nuanced suggestions.
You review everything
Since nothing goes to a server, there's no external content filtering. Always review suggestions before accepting—you're responsible for your final text.
Pricing
Recommended
Lifetime
$9.99 one-time
Pay once, use forever. No recurring charges.
Get SyntaxisMonthly
$1 per month
Flexible option. Cancel anytime.
Start trialAll plans include
- Unlimited proofreading and rewriting
- Live corrections as you type
- 5 correction strength levels
- Custom instructions
- Sensitive site protection
- 14-day free trial
Ready to write with confidence?
Start your free trial today. No credit card required.
Install Syntaxis