PrivWrite
Grammar and style checker that physically cannot upload your text.
Standalone $2.99/mo or $29.90/yr.
Why it matters
What PrivWrite does that nothing else does
- Benefit 1:
connect-src:none CSP — your draft is mathematically incapable of leaving Chrome.
- Benefit 2:
30+ rule-based checks plus on-device AI for advanced suggestions.
- Benefit 3:
Free tier covers 20 checks per day; replaces LanguageTool's former free plan.
- Benefit 4:
Pro tier unlocks unlimited checks; Grammarly costs more and reads every keystroke.
Pricing
Buy PrivWrite alone, or get the bundle
Use only this extension? Buy it standalone. Use three or more Aegis extensions? The Pro Pack pays for itself.
Standalone
PrivWrite Pro
$2.99/mo
Or $29.90/yr — save when paid annually.
Pro tier on PrivWrite only. Cancel anytime.
Get PrivWrite ProBest value
Save $21/yrAegis Pro Pack
$9.99/mo
Or $99/yr — covers every Aegis extension you install.
Unlocks Pro on PrivWrite and every other Aegis extension. New extensions included automatically.
Get the Pro PackBuilt the Aegis way
Privacy you can verify, not just claim
On-device by default
Every Aegis extension runs in your browser. No silent cloud upload, no server-side processing of your activity.
Never sold, never bundled
Aegis extensions never change ownership. Updates come from the same publisher you trusted at install.
No account required
Install and use immediately. Pro features unlock with a single sign-in to your Aegis Pro Pack.
MV3-native
Built for Chrome Manifest V3 from day one — no deprecation warnings, no broken background pages.
Why switch
PrivWrite vs Grammarly
Grammarly charges multiple times more per month and uploads every keystroke to its servers (Incogni January 2026 ranked it among the most privacy-damaging extensions). PrivWrite's connect-src:none CSP makes upload physically impossible.
| Feature | PrivWrite | Grammarly |
|---|---|---|
| Monthly price | $2.99/mo | $12.00/mo |
| Account required | No — install and use immediately | Often yes (varies by competitor) |
| Data leaves the browser | No — on-device by default | See competitor privacy policy |
| Ownership transfer risk | Aegis never sells extensions | Varies — see ExtensionWatch in this catalog |
| Bundled with Aegis Pro Pack | Yes — $9.99/mo unlocks every extension | No bundle |
See it in action
PrivWrite screenshots
More screenshots and the full feature walkthrough live on the PrivWrite landing page.
Common questions
- How is "physically cannot upload" enforced?
- The extension manifest sets `connect-src 'none'`, which Chrome enforces at the network layer. The extension code is unable to open a network connection — including to our own servers. Your draft cannot leave the browser.
- How does Pro work without server-side AI?
- Advanced suggestions use the on-device browser AI APIs Chrome ships. The model runs in the same content-script context as your draft, so the input never has to leave for inference.
- Will PrivWrite work in any text field?
- Yes — Gmail, Notion, Slack, GitHub, Google Docs, comment boxes, web forms. The extension uses the standard contenteditable hook so it does not need a per-site adapter.
- How does the Aegis Pro Pack unlock PrivWrite?
- Sign in to aegisfirma.com from any installed Aegis extension popup. The cookie-auth flow detects your active Pro Pack and unlocks Pro features instantly — no license key to copy or paste.
- Where is my PrivWrite data stored?
- PrivWrite stores everything in chrome.storage on your device. Your subscription record lives in our payment provider's account; we do not aggregate browsing or activity data.
- Can I cancel PrivWrite Pro anytime?
- Yes — billing stops at the end of the current period. Pro features remain active until the period ends, then drop back to the free tier.
- Why should I trust an extension I just heard of?
- Aegis extensions never change ownership and never sell user data. We publish security audit results and ship MV3-native code so Chrome itself enforces the permissions we claim.
Try PrivWrite free, upgrade when ready
Free tier covers the basics. Pro Pack at $9.99/mo unlocks every Aegis extension at once.