Open Source Instant Messengers for Android

An encrypted messaging app focused on privacy, supporting texts, calls, photos, videos, files, and group chats, with no ads or trackers.

A secure collaboration app with end-to-end encryption and interoperability across web, desktop, and mobile. Includes chat, voice, and video calls.

Open protocol for decentralized, end-to-end encrypted communication supporting instant messaging, VoIP, IoT, data persistence, and silos bridging over federated servers.

With the rise of widespread government monitoring programs, Tox is an easy to use application that allows you to connect with friends and loved ones without anyone else listening in.

SimpleX - the most private and secure chat and applications platform - now with double ratchet E2E encryption! Built on Haskell with Love and Coffee.

Instant messaging with text, voice, video calling, screen sharing, privacy controls, customizable permissions, moderation, bots, and open-source design.

Wire is the most secure collaboration platform featuring messenger, voice, video, conference calls, file-sharing, and external collaboration –all protected by the most secure end-to-end-encryption.

Jami (formerly GNU Ring, SFLphone) positions itself as a potential free Skype replacement

An open-source decentralized and encrypted messaging app even without internet connection via Wi-Fi and Bluetooth. Messages are stored securely on your device, not in the cloud. Connect directly with nearby contacts - no Internet access is required.

Threema is a new mobile messaging app that puts security first. With true end-to-end encryption, you can rest assured that only you and the intended recipient can read your messages.

Fossify Messenger is your trusted messaging companion, designed to enhance your messaging experience in various ways.

Open source, decentralized communication platform with encrypted chat, voice and video calls, file sharing using anonymous tunnels, forums, and channels.

Molly is an independent Signal fork for Android.

It is the brand new, and fastest ever, Matrix client. It is for personal and community use, and will support enterprise functionality later this year.

Uses email as a decentralized chat platform with modern interface, open source code, no central servers, strong privacy controls, and no account signup.

Open-source messaging platform with real-time group, direct, and private chats, file sharing, video conferencing, custom integrations, and self-hosting.

QUIK is an open source replacement to the stock messaging app on Android. It is a continuation of QKSMS.

Linphone is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features.

Multi-platform encrypted messenger supporting one-to-one and group chats, file and image sharing, decentralized open-source design, and ad-free nonprofit operation.

Conversations is a privacy focused, open source XMPP Texting [Jabber] client for Android 4.0+ smart phones with wife-approved easy encryption [OTR, OMEMO, or GPG].

QKSMS brings a refreshingly beautiful and responsive Material Design touch to the stale state of text messaging.

ArcaneChat is a Delta Chat client and was created with a focus on usability, good user experience, and saving data plan. Also the app usually experiments with new features that eventually might get added to the official Delta Chat client.

XMPP, or Extensible Messaging and Presence Protocol, is an open standard for instant messaging and real-time communication, allowing for message exchanges between any two entities on the Internet. It's known for its decentralized and extensible nature.

An alternative Telegram client based on TDLib, with higher speed, slicker animations and experimental features.

Berty is a secure peer-to-peer messaging app that works with or without internet access, cellular data or trust in the network. Berty is a privacy-first messaging application built on top of the Berty Protocol.