WhisFai

WhisFai is a privacy-first communication app built for people who want genuine security, not just a privacy policy. Every message, voice note, file, and call is protected by end-to-end encryption that not even WhisFai can read.

WHAT MAKES WHISFAI DIFFERENT

No phone number required. No email required. Just a username and password.

Keys are never exchanged over the internet. Two people. One room. One Bluetooth handshake. That is the only way a connection begins.

Your keys are backed up on our server, but wrapped in your password, which we never see. Without your password, the backup is meaningless, even to us.

All data is encrypted on your device before it leaves. The server stores only ciphertext it cannot read. Not in transit. Not at rest. Never.

CORE FEATURES

End-to-End Encrypted Messaging

Every conversation is secured with the Signal-style Double Ratchet protocol on top of X3DH key exchange. Messages are encrypted on your device before they leave. No server ever sees your plaintext.

Encrypted Voice and Video Calls

Crystal-clear voice and video calls routed through an encrypted LiveKit media server. No call logs are stored. Pro plan unlocks HD video quality.

Nearby Discovery

Meet people in person and connect securely using Bluetooth Low Energy. WhisFai scans for nearby users, shows signal strength in real time, and lets you verify and add contacts face to face.

Friend-of-Friend Detection

WhisFai passively detects when a friend's friend is physically nearby and sends you a discreet notification so you can choose to connect without revealing your identity to strangers.

Per-Connection Encryption Keys

Each friendship gets its own unique encryption key generated during in-person BLE pairing. These keys never leave your devices unprotected.

Encrypted File and Media Sharing

Send images, documents, and voice notes, all encrypted before upload. Supports PDF, Word, Excel, CSV, and common image formats up to 50 MB per file.

Screen Sharing

Share your screen during a video call for collaboration or support, secured inside the same encrypted session.

Disappearing Messages

Set messages to auto-delete after 1 hour, 1 day, 7 days, or 30 days.

Biometric App Lock

Lock WhisFai with Face ID, Touch ID, or fingerprint so your chats stay private even if your phone is unlocked.

Dark and Light Mode

Full dark and light theme support.

PLANS

Free: Text chat, voice calls, up to 5 direct friends

Pro: Video calls, file sharing, screen sharing, up to 500 friends, HD call quality, larger storage, and all privacy features

New users receive a 1-month free Pro trial.

PRIVACY PROMISE

We never ask for your phone number or email.

We never sell your data to third parties.

We never store your private keys in readable form.

If you forget your password, recovery is not possible by design. True privacy means zero back doors.

WhisFai runs on subscriptions, not ads. Your privacy is not the product.

TECHNICAL HIGHLIGHTS

Signal Double Ratchet plus X3DH key exchange

X25519 identity keys stored in device Keychain

AES-256-CBC private key encryption

NaCl TweetNaCl XSalsa20-Poly1305 for cryptographic boxes