Encrypted by default. Reachable on your terms.
Every message is encrypted on your device and decrypted on theirs. We relay ciphertext we cannot read — not as a setting you turn on, but as the only thing the server is built to carry.
Three steps, and we are blind for the middle one.
End-to-end is a statement about the whole journey, not about either end. Here is the entire trip your message takes — there is no fourth step where anyone reads it.
Sealed on your phone
Your device encrypts the message for each recipient device, with keys that never leave the keychain.
Relayed blind
Our server moves opaque ciphertext. It sees which device gets which envelope — never what is inside one.
Opened on theirs
Only the recipient’s devices hold the private half. To everyone else, including us, it is noise.
Knowing your number is not the same as being able to message you
Most apps treat a phone number as a permanent invitation. A leaked contact list becomes a spam list, and there is nothing you can do about it. Voiid separates being findable from being reachable.
The chat opens directly.
Mutual contacts are the one case where both people have already made the decision. There is nothing left to ask, so Voiid does not invent a step to ask it.
- They have your number
- You have theirs
Groups that stay encrypted as they grow
Group chats use MLS, the IETF standard for continuous group key agreement. Every member holds a share of the group key; adding or removing someone rolls it, so a person who leaves cannot read what is said afterwards and a person who joins cannot read what came before.
Roles are real: one owner, who can hand ownership on, and admins who can manage membership. Role changes appear in the conversation itself rather than happening invisibly.
A conversation with nobody but you
Note to Self is a real chat, not a scratchpad bolted onto the side. It syncs to your own linked devices and nowhere else — encrypted to your other devices exactly the way a message to a friend is encrypted to theirs. On a single device there is no one to encrypt to, so the note simply stays where you wrote it.
Read the encryption story in full
Every primitive we encrypt with, what deliberately stays public, and precisely what our servers can see.