A note that opens once. Files too. No account.
NO SUS Chat for your own devices. Send with one open, a watermark, or traceable copies.
Try it · Encrypted in your browser
Keep it. Send it. Still yours
Your chat lives in your Drive. What you send opens once, or carries a name.
Highlights
Three things, one app.
Your chat on every screen.
Open your domain, scan, approve. Same chat on your phone and laptop.
On screen: the app’s Home, Chat, with You pinned on top as a paper card, then your groups, and the Send button with Nox perched on it.
See howSend it three ways.
One open, watermarked, or traceable copies.
On screen: the last step of Send, How should it open?, with three round stamps: One open picked, Watermarked and Traceable copies.
See howOpens any PDF.
Pick NO SUS in Android’s Open with.
On screen: Android’s Open with sheet, with NO SUS picked for a PDF.
See howNO SUS Chat
One chat. Every screen.
Phone, laptop, a friend’s phone. Your Drive is the only storage, and the other screen never gets your Google password.
- Open your domain on any screen. It shows a QR.
- Scan it and match the number.
- Approve. Your chat opens there.
Open your domain on any screen. It shows a QR.
Scan it and match the number.
Approve. Your chat opens there.
One open
Burn it. Then it’s gone.
Write it.
A note, or up to 10 files.
Lock it.
Encrypted in your browser before it leaves.
They open it once.
No account, no app.
Then it burns.
Deleted from our server. The link goes dead.
Traceable copies
Trace it. If it leaks, you’ll know whose.
…slips five weeks. Do not share this.
Copy 3 — made for Meera
Launch slips five weeks. Don’t share this.
Launch slips 5 weeks. Don’t share this.
Launch slips five weeks. Do not share this.
Launch slips 5 weeks. Do not share it.
Launch slips five weeks. Don’t share it.
Write it once.
Seal one note for up to 100 readers.
One copy each.
Each slightly reworded, with an invisible marker.
Something leaks.
Paste it, see whose copy. A strong hint, not proof.
On the record.
Each open leaves a receipt you can check.
Watermarked. For documents, each viewer’s email is stamped on every page.
Opens any PDF
Any PDF, any app. Opens in NO SUS.
NO SUS shows up in Android’s Open with. Share safely from there.
The fine print
AES-256
Encrypted in your browser.
1 open
Then the note is deleted.
50 MB
Up to 10 files in one link.
0
Accounts needed to open one.
Limits
Shared screens. Honest limits.
Chrome can't block a screenshot.
Our Android app blocks them. In a browser, the page is watermarked and logged, not blocked.
A code is a trade-off.
While a 6-digit code is valid, and up to 10 min after, our server holds its key too.
Downloads stay downloaded.
Revoking stops new opens, not saved copies.
Compare
Side by side. Marked fairly.
| NO SUS | Chat apps | Email attachment | One-time note sites | |
|---|---|---|---|---|
| Opens once, then deleted | Yes: Burn | Partly: View-once media | No | Yes |
| No account to open | Yes: Burn · Canary | No | No | Yes |
| Watermark per viewer | Yes: Watermarked | No | No | No |
| Open your files on a borrowed PC without signing in | Yes: NO SUS Chat | No | No | No |
| Know whose copy leaked | Yes: Traceable copies | No | No | No |
Yes Partly No
Based on default behaviour of common apps.
FAQ
Straight answers.
- Can you screenshot WhatsApp view once?
- Which apps have disappearing messages?
- View-once screenshot table
Updated
Do I need an account to try a burn note?
No. Burn Notes and Burn Files need no account for the sender or the recipient, so you can make one right here on nosus.foo.
How do Burn Notes and Burn Files work?
They are encrypted in your browser with AES-256 before upload, open once, and are then deleted from our server. The key travels in the link, after the #. If you ask for a 6-digit code, our server holds its key too, until up to 10 minutes after the code is used or expires.
What is my domain?
Your own address on NO SUS, like riya.nosus.foo. Open it on any screen and it shows a QR. Scan it with the NO SUS app, match the number and approve, and your NO SUS Chat opens there.
What can a borrowed computer see?
Only what you approve on your phone, for that session. It never gets your Google password or token, and your files stay in your own Google Drive. Anything you download or print there can stay on that computer.
Can NO SUS block screenshots in Chrome?
No. No website can block screenshots in Chrome. NO SUS stamps the viewer's email on the page and logs who opened it, so a leak can be traced. In the Android app, screenshots are blocked.
What happens if your servers get hacked?
While a burn's 6-digit code is still valid, a break-in could reveal its key; the key is deleted within 10 minutes after the code is used or expires, leaving only encrypted data. Other stored documents aren't end-to-end encrypted, so a full storage breach could expose them.
Is there an iPhone or Android app?
Android is in closed beta on Google Play. On iPhone or any computer, use the web app at app.nosus.foo.
