Invitation Only · Private Beta

Private messaging.
Zero compromises.

Rail Gun is civic infrastructure for private communication. End-to-end encrypted messaging where your keys never leave your device. Truth without permission.

Download NowLearn About Security
X3DH + Double RatchetSignal Protocol key exchange
Curve25519Modern elliptic curve cryptography
ChaCha20-Poly1305AEAD authenticated encryption

Download Rail Gun

Get Rail Gun for your platform and start messaging with true privacy. Your keys never leave your device.

Desktop Apps

Windows

Windows 10+ (64-bit)

Download

macOS

macOS 11+ (Intel & Apple Silicon)

Download

Linux

AppImage or .deb package

Download

Mobile Apps

iOS

iPhone & iPad

Coming Soon

Android

Android phones & tablets

Coming Soon
Version 0.1.0•Release Notes•Source Code

Automatic Updates

Rail Gun automatically checks for updates and installs them securely. All updates are cryptographically signed to ensure authenticity.

Verify Your Download (Advanced)

1. Download the checksums file:

SHA256SUMS.txt from the release page

2. Verify the checksum:

# macOS/Linux sha256sum -c SHA256SUMS.txt --ignore-missing # Windows PowerShell Get-FileHash Rail-Gun-*.exe | Format-List

Why Rail Gun?

Built from the ground up with privacy and security as the foundation, not an afterthought.

Signal Protocol

Double Ratchet (KDF chains) + X3DH key exchange. Industry-standard end-to-end encryption with libsignal

Curve25519 Encryption

Modern elliptic curve cryptography (Curve25519) for key exchange and signatures via NaCl

ChaCha20-Poly1305

AEAD cipher providing authenticated encryption with associated data (AEAD) for message confidentiality

Group Encryption

Communities with encrypted channels using Signal Protocol group sessions and per-recipient keys

Perfect Forward Secrecy

Each message uses ephemeral keys. Compromised long-term keys cannot decrypt past messages

Open Source & Auditable

Full transparency on GitHub. Cryptographic implementations reviewed and auditable by security experts

Server Blindness

Backend sees only encrypted blobs (ChaCha20-Poly1305) and routing metadata. Content never exposed

Desktop-First Client

Native Electron app for macOS, Windows, Linux with local key storage and OS-level encryption

Security Built-In

Your messages are truly private

Rail Gun uses the same encryption protocol trusted by billions of users worldwide. Your private keys are generated locally and never touch our servers.

  • Signal Protocol (X3DH + Double Ratchet)
  • Perfect Forward Secrecy (PFS)
  • Extended Triple Diffie-Hellman (X3DH)
  • Double Ratchet Algorithm (KDF Chain)
  • libsodium / NaCl (Curve25519, ChaCha20-Poly1305)
  • HMAC-based Key Derivation Function (HKDF)
  • Local key generation and storage (never transmitted)
  • Open source and auditable (GitHub)
  • No phone number required
  • Metadata minimization (routing only)
  • Forward Secrecy & Backward Secrecy
  • Deniable Authentication

Verify Your Download

Always verify downloads to ensure they haven't been tampered with.

1. Import our GPG key:

gpg --keyserver keys.openpgp.org --recv-keys [KEY_ID]

2. Verify the signature:

gpg --verify SHA256SUMS.txt.asc SHA256SUMS.txt

3. Check the checksum:

# macOS/Linux sha256sum -c SHA256SUMS.txt --ignore-missing
Full checksums available in SHA256SUMS.txt

Available Everywhere

Download Rail Gun for your platform or use the web version.

macOS

macOS, Windows, Linux

Download

Web App

Web App

Coming Soon

iOS & Android

iOS, Android

Coming Soon

Ready to take back your privacy?

Join thousands of users who trust Rail Gun for secure communication.

Get StartedGet Started