Sigalion Labs presents
Mystiko
μυστικό Greek: a secret
Premium encrypted messaging for people with something worth keeping quiet.
Exclusive to Android.
02 Closed circuit
Mystiko speaks only to Mystiko
No phone number. No email address. No contact list. You are a 26-character ID, and you hand it to the people you choose.
Sealed in your hand
A message is encrypted on your phone before it leaves, and opened only on the phone it was sent to.
A new key every time
Each message gets its own key. Nothing is reused from one message to the next.
Sender unknown
Your identity travels inside the sealed message. Our server passes it along without learning who wrote it.
Nothing for us to read
We hold no key that opens your messages. If we are asked for them, sealed text is all there is.
03 The sender decides
Your words, your clock
Whoever writes a message chooses how long it lives, and the choice holds on both phones.
- Once
Delete after reading
It stays closed until the reader taps it, then it is gone when they leave the chat.
- 5d
Five days
Removed from both phones five days after you sent it.
- 30d
Thirty days
Removed from both phones thirty days after you sent it.
- ∞
No limit
Kept until one of you deletes it.
Take it back. Press and hold a message you sent and it is removed from both phones. Screenshots are blocked inside the app. A screen can still be photographed with another camera, and no app can prevent that.
04 Five levels
Choose how deep it goes
Reading is free at every level. Your subscription sets how the messages you send are sealed.
-
α
Standard
Level 1
$1.99/ month
or $19.10 a year
X25519
AES-128-GCMA sound lock on every message.
-
β
Strong
Level 2
$2.99/ month
or $28.70 a year
X25519
AES-256-GCMThe larger key governments specify for their own secrets.
-
γ
Stream
Level 3
$4.99/ month
or $47.90 a year
X25519
ChaCha20-Poly1305A second cipher family, built independently of AES.
-
δ
Quantum
Level 4
$9.99/ month
or $95.90 a year
X25519 + ML-KEM-768
AES-256-GCMAdds a post-quantum key exchange against machines that do not exist yet.
-
ε
Maximum
Level 5
$19.99/ month
or $191.90 a year
X25519 + ML-KEM-1024
AES-256-GCM over ChaCha20-Poly1305The strongest exchange, and two ciphers that must both fail.
No level is known to be breakable today. Higher levels add margin against future attacks. Prices are in US dollars, billed through Google Play. A yearly plan costs 20% less than twelve monthly payments.
05 In transit
What crosses the wire
Between the two phones there is only sealed text. This is an illustration, and the real thing looks much the same to anyone watching.
What our server holds
Your public keys, and sealed messages that have not been collected yet. Once a phone collects a message, it is deleted from the server.
What it never has
Your private keys, your contacts' names, your chat history, or the lifespan you chose for a message. Those stay on your phone.