Delta Chat: Secure, Decentralized Messaging Without the Phone Number

Take back control of your privacy with the only messenger that works over email. No phone number required, no central servers to trust—just pure, end-to-end encrypted freedom.

Communication & Messaging ›

Publisher

merlinux GmbH

Privacy in Action

Discover the interface used by 154K+ users.

Delta Chat mobile app interface showing a list of decentralized private messages

Delta Chat app interface showing anonymous instant onboarding without the need for a phone number or email

Delta Chat app gallery view on iPhone showing shared photos and media

Delta Chat mobile app settings screen showing user profile and connectivity status

Smartphone screen displaying Delta Chat secure messaging onboarding with QR code scanning instructions and encryption details.

Total Communication Sovereignty

The tools that make this app stand out, trusted by 154K+ users.

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No Phone Number Required

Onboard instantly without sharing your mobile identity. Stay truly anonymous by using any email address as your unique identifier.

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Audited End-to-End Encryption

Every message is secured with open-source cryptography, making your conversations invisible to ISPs, server owners, and third-party attackers.

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Decentralized & Sovereign

Eliminate central points of failure. Use your own server or any trusted provider to maintain complete ownership of your digital footprint.

Loved by users worldwide

Trusted by 154K+ people who love this app.

"Finally, a messenger that doesn't demand my phone number or private data. I love that I can use my own mail server and keep my communication completely under my control. It is the ultimate tool for anyone serious about digital sovereignty."

Alex Rivera, Software Architect

"Delta Chat is a game-changer for my work in the field. It remains incredibly reliable even under poor network conditions, and the fact that I can message anyone with an email address—even if they don't have the app—makes onboarding my sources effortless."

Sarah Jenkins, Investigative Journalist

About the app

Everything you need to know about Delta Chat.

Description

Delta Chat is a reliable decentralized instant messenger that is easy and fun to use for friends, family, groups and organizations. Delta Chat is developed by a dedicated FOSS contributor community that jointly releases refinements and new features several times a year, across many stores and platforms world-wide. Features at a glance: • Anonymous. Instant onboarding without a phone number, e-mail or other private data. • Flexible. Supports multiple chat profiles and is easy to setup on multiple devices. • Reliable. Works under bad and adversarial network conditions. • Secure. Audited End-to-End encryption safe against network and server attacks. • Sovereign. Can be run with your own e-mail address or server. • FOSS. Fully Open Source/Free Software, built on Internet Standards.

Latest Version

2.33.0

Size

46.3 MB

First Released

Jan 8, 2020

Take Back Control of Your Conversations

Join the decentralized revolution today. No phone numbers, no tracking, and no corporate servers—just 100% open-source privacy on your own terms.

FAQ

Frequently Asked Questions

Everything you need to know about Delta Chat

Does Delta Chat require a phone number or email for registration?

Yes, Delta Chat does not require a phone number, e-mail, or other private data for instant onboarding. It offers anonymous registration.

Is Delta Chat a secure messenger?

Yes, Delta Chat is secure. It uses audited End-to-End encryption to protect against network and server attacks, ensuring private communication for its users.

Can Delta Chat be used on multiple devices?

Yes, Delta Chat supports multiple chat profiles and is easy to set up on multiple devices. This provides flexible usage across various platforms.

Is Delta Chat open source software?

Yes, Delta Chat is Fully Open Source/Free Software (FOSS). It is built on Internet Standards and is maintained by a dedicated contributor community.

What is Delta Chat?

Delta Chat is a reliable, decentralized instant messenger designed for friends, family, groups, and organizations. It emphasizes privacy, security, and open standards.

How does Delta Chat perform in bad network conditions?

Delta Chat is reliable under diverse network conditions. It works effectively even under bad and adversarial network situations, ensuring consistent communication.