The secure messaging app that assumes everyone is listening.

They're watching. Every message.

Alice
Not secure

Hey, can you send me the account details?

10:42 AM

Sure, the password is Summer2024!

10:43 AM

Got it. What about the PIN?

10:44 AM

It's 4729. Don't share this with anyone.

10:45 AM

Without encryption, every keystroke is exposed.

INTEL BRIEFING

A secure messaging app by construction, not by promise

Security claims are easy. Here's how NoChat actually enforces them at the protocol level.

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Zero-Trust Server

The server stores encrypted blobs, routes them, and nothing else. No plaintext ever touches our infrastructure.

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Authenticated Encryption

AES-256-GCM is an AEAD cipher: tampering is detected automatically, so a compromised network can't silently alter messages.

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Post-Quantum DMs

Direct messages derive their session key through a hybrid X25519 + ML-KEM (Kyber-1024) exchange, so a future quantum adversary can't unwrap today's captured DMs. Groups and calls are on the roadmap.

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DECLASSIFIED

Auditable & Standards-Based

Built on open, standardized cryptography, with no homegrown crypto. Don't trust our word; the primitives are public and documented.

Built on auditable, standards-based cryptography. How we secure it

Standards Based

A secure messaging app
that uses the cryptography governments trust

NoChat uses the exact post-quantum primitives selected by NIST for federal use: ML-KEM (Kyber-1024) for direct-message key exchange and ML-DSA-65 (FIPS 204) for signatures, alongside battle-tested AES-256-GCM. No homegrown crypto, no hand-waving.

NIST Approved Standards

The same cryptography the US government will use

ML-KEM

Key encapsulation

Kyber-1024

ML-DSA

Digital signatures

ML-DSA-65 (FIPS 204)

Harvest Now, Decrypt Later

Why this matters today, not tomorrow

Nation states are already storing encrypted communications. When quantum computers arrive, they'll decrypt years of captured data instantly.

NoChat's direct messages get post-quantum key exchange against this threat today

Most mainstream messengers, including WhatsApp and Telegram, still don't offer post-quantum messaging. NoChat ships post-quantum key exchange for your direct messages today.

FAQ

secure messaging app: questions, answered

Common secure messaging app questions, answered plainly.

What makes a messaging app truly secure?

Real security means the service can't read your messages even if it wanted to, metadata is minimized, the cryptography is standardized and auditable, and there's no single point of trust. NoChat hits all four.

What threat model does NoChat protect against?

Network attackers (ISPs, hotspots, governments), a compromised NoChat server, and future quantum adversaries. The only thing NoChat can't protect against is a malicious endpoint. If your own device is compromised, no app can save you.

Is NoChat the most secure messaging app available?

NoChat is among the few apps that combine post-quantum key exchange for direct messages, fully anonymous signup, and a zero-trust backend, all at once. Signal is excellent and also ships post-quantum key agreement (PQXDH), but it still requires a phone number.

Has NoChat been audited?

Not yet formally. NoChat is built on open, standardized cryptographic primitives, and the crypto inventory documents every primitive and where it runs. No third-party audit has been completed to date. We welcome security researchers to review the implementation.

How is NoChat protected against a server breach?

There's nothing useful to steal. The database holds encrypted ciphertext with no decryption keys attached. A full database dump would give an attacker exactly what it gives us: opaque blobs.

Can law enforcement get my messages from NoChat?

Under valid legal process we can produce account metadata where it exists, but message content is end-to-end encrypted and we have no ability to decrypt it. We designed the system so this isn't a policy choice. It's a mathematical one.

What secure messaging app features matter most?

End-to-end encryption, authenticated encryption (tamper detection), forward secrecy, auditable standards-based cryptography, minimal metadata, and ideally post-quantum readiness. NoChat provides all of these.

Does NoChat cost money?

No. NoChat is free to use and free to self-host. Security should not be a paid upgrade.

Ready to go dark?

Get NoChat for iPhone & Android

Download on theApp StoreGET IT ONGoogle Play
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or create an account

No account required. No ads, no data sold. No compromises.

Desktop apps

FROM THE BLOG

Dispatches on private messaging

Reporting on encryption, anonymous messaging, and what it takes to build a secure messaging app with no phone number required.

Oct 6, 2026 · 5 min read

Opt Out October: Reclaiming Your Digital Privacy with Secure Messaging

Explore Opt Out October's call for digital independence. Learn how private, phone-number-free messaging protects against surveillance and data leaks.

Oct 4, 2026 · 5 min read

Why Private Messaging Matters: A Look at Social Media Surveillance

A recent court ruling highlights the ongoing concern of social media surveillance. Learn why private messaging, free from phone numbers, is essential.

Oct 4, 2026 · 5 min read

Why Private Messaging Matters: Resisting Surveillance in a Digital Age

Explore the growing concerns about digital surveillance and how private, phone-number-free messaging protects your data and identity.

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encrypted messaging app

NoChat is an encrypted messaging app with end-to-end encryption and post-quantum key exchange for direct messages. Anonymous sign-up, zero knowledge storage, no phone number required.

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zero knowledge messaging

NoChat is a zero knowledge messaging app: your keys never leave your device unencrypted, the server stores only ciphertext, and we mathematically cannot decrypt your messages.

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post-quantum encryption messaging

Post-quantum encrypted messaging using ML-KEM (Kyber-1024) + AES-256-GCM. No phone number required. Protect DMs against harvest-now-decrypt-later attacks. Free, open source.

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Join the quiet ones

Join a community that values privacy over convenience.

Open
standards-based crypto
256-bit
AES-256-GCM encryption
Post-quantum
key exchange for DMs

No phone number, no tracking ID

Sign up anonymously. There's no number to link your conversations back to you.

Encrypted on your device

Messages are sealed with AES-256-GCM before they leave your device. The server only ever sees ciphertext.

Verify, don't trust us

Built on open, standardized cryptography, with no homegrown crypto. Verify our claims against public standards instead of taking our word for it.

See how we secure it