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Signal Protocol
Industry-standard encryption with X3DH key agreement and Double Ratchet algorithm. Forward secrecy ensures past messages stay secure even if keys are compromised.
Signal Protocol Encryption
Private messaging
Private messaging
without compromise
GhostChat is a privacy-first encrypted messaging app. End-to-end encryption, sealed sender technology, no phone number required. Your conversations stay between you and your recipientβnot even we can read them.
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End-to-end encrypted
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No phone required
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Open source
Everything you need for private communication
Built from the ground up with privacy as the foundation, not an afterthought.
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Sealed Sender
Even our servers can't see who's messaging whom. Your metadata is protected with the same sealed sender technology used by Signal.
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No Phone Required
Create an account with just a cryptographic key. No phone number, no email, no personal information required. True anonymity.
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Voice & Video Calls
Crystal-clear encrypted voice and video calls using WebRTC with DTLS-SRTP. Call signaling is fully end-to-end encrypted.
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Disappearing Messages
Set messages to automatically disappear after being read. Choose from seconds to weeksβyour conversation, your rules.
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Multi-Device Sync
Use GhostChat on all your devices with secure QR code linking. Messages sync seamlessly while maintaining end-to-end encryption.
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Self-Hostable
Run your own GhostChat server for complete control. Perfect for organizations, families, or anyone who wants full sovereignty over their data.
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Secure File Sharing
Share images, videos, documents, and voice messages with the same encryption as your texts. Every file is encrypted before leaving your device.
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Verified Contacts
Compare 60-digit safety numbers in person or scan QR codes to verify you're talking to the right person. Know when keys change.
Security
Cryptography you can trust
GhostChat implements the full Signal Protocolβthe same encryption trusted by journalists, activists, and privacy advocates worldwide.
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X3DH Key Agreement
Extended Triple Diffie-Hellman establishes shared secrets without prior communication.
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Double Ratchet Algorithm
Every message has a unique key. Compromise one, and past/future messages stay safe.
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XSalsa20-Poly1305
Military-grade authenticated encryption. Your messages are tamper-proof.
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Sealed Sender
Server-blind delivery means even we can't see who's talking to whom.
Signal Protocol Flow
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X3DH Key Exchange
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HKDF Key Derivation
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Double Ratchet Per-Message Keys
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XSalsa20 Encryption
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Poly1305 Authentication
Up and running in minutes
No sign-up forms. No personal information. Just download and start chatting securely.
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Download
Get GhostChat for your platformβWeb, Windows, Mac, or Linux.
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Generate Keys
Your cryptographic identity is created automatically on first launch.
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Share Your Key
Exchange public keys with friends via any channelβit's safe to share.
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Chat Privately
Start messaging with end-to-end encryption from your very first message.
How we stack up
See how GhostChat compares to other messaging apps on privacy and security.
Feature
GhostChat
Signal
WhatsApp
End-to-End Encryption
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No Phone Number Required
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Sealed Sender (Metadata Protection)
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Self-Hostable
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Fully Open Source
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No Data Collection
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Frequently asked questions
Everything you need to know about GhostChat and your privacy.
Is GhostChat really private?
Yes. GhostChat uses Signal Protocol for end-to-end encryption and Sealed Sender technology so even the server cannot see who is messaging whom. Your messages can only be read by you and your recipient.
Do I need a phone number?
No. GhostChat uses cryptographic public keys for identity instead of phone numbers, providing better privacy and anonymity. You can start chatting without sharing any personal information.
Can I host my own server?
Absolutely. GhostChat is fully open source and designed for easy self-hosting. You can run your own server to have complete control over your messaging infrastructure.
What encryption does it use?
GhostChat implements the full Signal Protocol including X3DH key agreement, Double Ratchet algorithm, and XSalsa20-Poly1305 encryption. It provides forward secrecy and post-compromise security.
Is it free?
Yes, GhostChat is completely free and open source. There are no ads, no premium tiers, and no hidden costs. Privacy shouldn't be a luxury.
How do I verify contacts?
GhostChat generates 60-digit safety numbers (like Signal) that you can compare in person or via a trusted channel. You can also scan QR codes for quick verification.
Ready to chat privately?
Join thousands of privacy-conscious users. Download GhostChat today and take control of your conversations.