End-to-end encrypted
point-to-point messaging.
Platytalk is a Signal-grade messenger built into PlatypusTools and runnable from any browser. Messages are encrypted on your device with X25519 + AES-256-GCM and Signal-style forward-secret ratcheting. The relay never sees plaintext. Sign in with your Microsoft account, MFA via Microsoft Authenticator.
Mission profile
Everything Platytalk can do — without ever exposing your messages to anyone but the people you sent them to.
Zero-knowledge relay
The relay only routes opaque ciphertext. Keys never leave your device.
Multi-device sync
Read on desktop or browser. Messages sync — and disappear — everywhere.
Disappearing messages
Set a TTL per conversation. Messages self-destruct on every device once it expires.
Group chats
End-to-end encrypted group sessions with sender-key ratcheting per recipient.
Add by handle / QR
Find contacts by their Platytalk handle, or scan a one-shot QR or invite link.
Delete everywhere
Tombstone a message and it vanishes from every linked device — yours and theirs.
Cryptography
Modern primitives, simple to audit, hard to weaken.
- Identity long-term X25519 + ECDSA-P256 signing key per device
- Session X3DH-lite handshake → 32-byte conversation root key
- Per-message HKDF-SHA256 derived AES-256-GCM key, fresh nonce, AAD-bound counter
- Forward secrecy ephemeral DH ratchet on every outgoing message
- Verification 60-digit safety numbers — compare in person or over a trusted channel
- Identity binding Microsoft account (Entra ID / personal MSA) with Microsoft Authenticator MFA
Why Microsoft sign-in?
Platytalk doesn’t want to manage your password, can’t SIM-swap your phone, and never sees your MFA codes. By delegating identity to Microsoft you get enterprise-grade account protection (Authenticator, passkeys, conditional access if your org uses Entra ID) for free — and Platytalk only ever receives a signed assertion that you are who you say.
Get Platytalk
Use it right now in your browser, or get the desktop build inside PlatypusTools.