Quantext: encrypt text on device with AES-256-GCM

Quantext is a local text vault, not a new messenger. Seal a note with AES-256-GCM on your phone and paste the envelope into SMS or email you already use.

Key takeaways

Quantext seals text with Web Crypto AES-256-GCM on the device.
It is not a chat app and does not host messages or keys.
A labeled keyring keeps more than one shared secret on the same phone.
Free users can manage up to four usable keys; Premium unlocks unlimited keys, ad-free use, and a vault passphrase.

Keep your messenger. Seal the note instead.

Most “secure chat” products ask everyone to install a new app and create accounts. Quantext by Knox Studios is an on-device text encryption vault: type, choose a labeled key, copy the sealed envelope, paste it into the thread you already have.

What you get

AES-256-GCM via Web Crypto, processed locally before you share.
Nicknamed keys so multiple shared secrets stay distinguishable.
No Quantext account and no first-party cloud for the notes themselves.
A compact dark vault UI rather than a social layout.

Share the envelope and the key separately

Anyone with the matching secret can unlock the text. Quantext does not overpromise anonymity — it is a straightforward clipboard vault. Download it on Google Play.

Frequently asked questions

What is Quantext?

Quantext is a Knox Studios Android app that seals text with on-device AES-256-GCM so you can paste the envelope into SMS, email, or other apps.

Does Quantext replace Signal or WhatsApp?

No. It is not a messenger. You still use the apps you already have; Quantext only seals the payload.

Does Quantext require an account?

No. Keys and unlock happen locally. Knox does not host your messages or keys.