Whisper — Secure Team Communication
End-to-end encrypted

Conversations that stay yours.

Whisper is a secure team communication platform with zero-knowledge encryption. Your messages never touch our servers in plaintext. Not even we can read them.

Read the security paper
#engineering-team
AK
Anna Kowalski
Pushed the fix to staging. Can someone review the PR?
e2e-encrypted · 256-bit
JR
James Reed
On it. Give me 10 minutes.
e2e-encrypted · 256-bit
Type a message... 🔒
Platform

Built for teams that take privacy seriously.

Every feature designed with encryption-first principles. No compromises.

01 / Encryption
Zero-knowledge architecture
Messages are encrypted on your device before they leave. Our servers store only ciphertext. We can't read your messages, and neither can anyone else — not ISPs, not governments, not us.
02 / Channels
Organized, encrypted
Channels, threads, and DMs — all end-to-end encrypted. Create as many spaces as your team needs.
03 / File sharing
Encrypted file transfers
Share documents, images, and code with the same encryption as messages. Files are encrypted client-side and never stored in plaintext.
04 / Search
Search without exposing
Searchable history that stays encrypted. Our search index uses homomorphic encryption — we search without decrypting.
05 / Compliance
SOC 2 · GDPR · HIPAA
Compliant by design.
06 / Access
Self-destructing messages
Set TTL on sensitive messages.
07 / Audit
Full audit trail
Track every access without storing content.
Security

The math is on your side.

# Client-side encryption
async function encrypt(msg, recipientPubKey) {
const key = await crypto.subtle.generateKey(
{ name: "AES-GCM", length: 256 },
true, ["encrypt", "decrypt"]
);
const encrypted = await crypto.subtle.encrypt(
{ name: "AES-GCM", iv }, key, encoder.encode(msg)
);
# Server only sees ciphertext
return base64(encrypted);
}
  • ⚡
    AES-256-GCM encryption
    Industry-standard symmetric encryption with authenticated data. Every message gets its own key.
  • 🔑
    X25519 key exchange
    Elliptic-curve Diffie-Hellman for key agreement. Forward secrecy on every session.
  • 🛡️
    Zero-knowledge architecture
    We don't have your keys. We can't decrypt your data. Subpoenas return ciphertext.
  • 📋
    Open-source clients
    All client code is public. Audit the encryption yourself. No backdoors, no trust required.
Pricing

Encryption for every team.

Start free. Upgrade when your team grows.

Starter
$0
free forever · up to 10 users
  • E2E encrypted channels
  • 1GB file storage
  • 30-day message history
  • Mobile + desktop apps
Team
$8
per user / month
  • Unlimited channels & DMs
  • 100GB file storage per user
  • Unlimited message history
  • Self-destructing messages
  • Full audit trail
  • SSO + SAML
Enterprise
Custom
contact sales
  • Self-hosted option
  • Unlimited storage
  • Custom key management
  • Dedicated support
  • HIPAA + FedRAMP
≡ hart

Hosted on hart

intrane-landings/57-whisperpublic
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