Send encrypted messages with no internet
rebelde sends encrypted messages over SMS. They never touch a server, they do not appear in the phone's own Messages app, and the carrier carries them without being able to read them. All you need is coverage and credit.
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No server. No account. Nothing to switch off.
The message is compressed and sealed whole, once, with a key that exists only between your phone and the other person's.
The sealed message is cut into 133-byte pieces: 8 of header, saying only which conversation it belongs to, and 125 unreadable.
They go out like ordinary SMS and the carrier delivers them the same, with no internet and no servers. The receiving phone never surfaces them in Messages.
Once every piece arrives, the other phone joins them and opens it. Anything that does not match the key is dropped in silence.
What no encryption will hide for you
End-to-end encryption
Static-static. Both sides derive the shared secret from keys they already hold, so there is no handshake to intercept.
One key per direction, derived with HKDF-SHA256. Fast on phones with no hardware acceleration.
Nine zero bytes and a 24-bit counter. The counter travels in the header; the nonce never does, saving twelve bytes on every SMS.
Thirty digits two people compare out loud. It is the only thing that closes the door on a key having been swapped in transit.
Free download
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Frequently asked
No. Coverage and credit only. That is the whole reason it exists: when the connection dies, SMS usually does not.
Whatever one SMS costs on your carrier. A short message is one SMS; the composer shows you live how many you are about to pay for.
No. Messages are port-addressed, so the system does not surface them and they leave no trace in the phone's ordinary history.
No. Both keys are needed: you hand over your code and that person hands over theirs. They are exchanged in person, by QR or by copying a short string.
Using SMS as the core feature requires being the phone's default SMS handler, which would mean replacing the app you already use. That is the opposite of a discreet tool.
The app does not protect you from that. Read the limits section: it sits above the download button for a reason.