Nothing. Zilch. Nada. It’s 100% free, always.

Nope. SayphKey is designed to work offline. Once cached, you can disconnect from the internet, use it safely, then delete your text before going back online. Nothing ever leaves your device.

Flip to Decrypt mode, paste your encrypted text back in, and your original text appears. Instant check.

Yes. The code is open on GitHub for anyone to review. SayphKey never stores or sends your data anywhere — everything happens locally on your device.

If you ever need to decrypt without SayphKey, you can rebuild your cipher alphabet manually: take your keyword, place it at the start of the alphabet, then follow with the remaining unused letters. Pair this new alphabet with the standard A–Z to decrypt your text. Example: keyword COMPUTER produces COMPUTERABDFGHIJKLNQSVWXYZ. With that, you can map encrypted letters back to the original. (You don’t lose the detail, but it’s easier to digest.)

I wanted a stress-free way to secure my own seed phrases. Metal plates, splitting words, and third parties all felt clunky. SayphKey is the simple offline alternative I wished existed.

Yes. SayphKey works in any modern browser on desktop or mobile. On mobile, you can “Add to Home Screen” for a full-screen app experience, even offline.

Without your keyword, you cannot decrypt your encrypted text. Always store your keyword separately and securely.

No. SayphKey is a complementary tool. You can still combine it with hardware wallets, metal backups, or multisig for extra protection.

Use “Add to Home Screen” (Safari on iOS, Chrome on Android). The icon shows up like any other app.

Refresh once while online. SayphKey updates in the background and is ready for offline again within ~30 seconds.

SayphKey works with A–Z (same as BIP‑39). You can add numbers/symbols yourself after encryption for extra layers.

You do. 100%. SayphKey never sees, stores, or transmits your information.

Absolutely. It’s meant to be shared — the more people who use it, the safer everyone’s information becomes.

It’s lightweight, offline‑first, and open‑source. No accounts, no servers — just a simple, secure way to protect sensitive information.