Nowadays almost every famous chat apps available for Android supports encrypted messaging. However, some of them are owned by tech giants like Facebook tends us to doubt the extent of the credibility of those apps over our privacy and security. With the rise of monitoring programs by the government and other major tech giants, the need for a super-secure open-source encrypted messaging app for Android is essential now to protect our privacy. About 50% of people are concerned about their privacy while using messenger or VoIP apps in Android. Although, what most of us didn't know that there are a handful of encrypted messaging apps are available for Android from open source community — which we can trust 100%. There are many free and open-source Android apps are available in the market but we have picked a few of the best mobile encrypted messaging and VoIP apps available right now for Android. All these listed open source messengers and VoIP apps support end-to-end encryption and download links are also provided. And all of them are the best alternatives for WhatsApp, Viber, Facebook Messenger, Skype, etc. Best Open-Source Encrypted Messaging Android Apps: 1. Signal Signal is an end-to-end encrypted open source messenger. They run their own server and the cryptography is similar to the proven OTR and done by specialists. Group chat is supported and you can send media files. VoIP is also supported. There is also an iOS version. Source code: GitHub 2. Telegram Maybe the favorite open-source encrypted messaging Android app of the majority of people. Telegram is an encrypted messenger just like WhatsApp and supports end-to-end encryption when choosing the "secret chat" option. It also has all the other things you would want from a messenger like group chats and photo/video sharing. Source code: GitHub 3. Conversations Conversations is a free and open-source Jabber/XMPP client for Android. Easy to use, reliable, battery friendly. With built-in support for images, group chats. Supports end-to-end encryption using OTR or OpenPGP. Since the app is priced $2.99 on Google Play but you can download it as free from F-Droid. Source code: GitHub 4. Xabber Xabber — another open-source encrypted messaging app with Jabber (XMPP) client with multi-account support and clean and simple modern material interface. In Google Play you can find two versions of Xabber — a free version and a supported version priced $2.99. It is also freely available in F-Droid. Source code: GitHub 5. Antox Antox is a new kind of open-source encrypted messaging Android app that uses the Tox protocol which is Peer to Peer to connect you with friends and family without anyone else listening in. Because of the use of Tox protocol, there will be high data usage and battery drain and for now WiFi only mode is recommended by the developer. Tox is completely free and comes without advertising — forever. Remember Antox is still on alpha stage and there may be some bugs. Source code: TokTok Project 6. Kontalk Messenger Kontalk is an end-to-end encrypted messenger, based on Open Standards (XMPP and OpenPGP). It automatically encrypts all messages and media without any user intervention. Source code: GitHub 7. Surespot Encrypted Messenger Everything sent using Surespot is end-to-end encrypted with symmetric-key encryption (256 bit AES-GCM) using keys created with 521-bit ECDH shared secret derivation, but you won't notice because security in Surespot is built-in, not a layer over something else. One of the notable features is you have control over your messages when you delete a sent message it will be removed from the receiver's phone and images are not shareable unless you make them so. Source code: GitHub 8. Linphone Linphone — another VoIP Android app with easy to use SIP client with video and end-to-end encryption support. It also features audio conference calls with various participants. Source code: GitHub 9. Briar Briar is an open-source messaging app designed for activists, journalists, and anyone else who needs a safe, easy and robust way to communicate. In Briar, messages are synchronized directly between the users' devices. Messages are sync via Bluetooth or Wi-Fi when the internet is down and when the internet is up, messages are sync via the Tor network. Source code: GitLab 10. Wire — Secure Messenger Wire messenger is a secure open-source platform comes with video calling and video conferencing for teams feature. It also allows inviting partners, customers, and suppliers to collaborate through the unique guest rooms. Cross-platform support of Wire messenger lets you collaborate whether in the office or on the road. Source code: GitHub 11. Delta Chat Delta Chat is a decentralized and open communication system that uses the existing e-mail server network. Delta Chat requires no additional server-side infrastructure — chat with anyone if you know their e-mail address, no need for them to install DeltaChat. Source code: GitHub 12. Silence Silence is a full replacement for the default text messaging application because all messages are encrypted locally and messages to other Silence users are encrypted over the air. So it is a perfect SMS/MMS application that allows you to protect your privacy while communicating with friends. Source code: GitLab 13. Q-municate Q-municate is a cross-platform open-source app bundled with a wide range of communication features including free messaging, file transfer, push notifications, audio/video calls. Source code: GitHub 14. Riot.im Riot is a flexible open-source chat app for Android with decentralized communication. It's kind of like an open-source discord without focusing gaming community. It's really easy to use while also being secure, as it supports the end-to-end encryption. Also, you can even run your own server and connect to everyone else. Source code: GitHub 15. FireChat FireChat is a unique messaging platform which works when there is no signal or mobile data. You can use it anywhere: planes, public transportation, cruise ships, campuses, and crowded events — all you need is a few people around you using FireChat. FireChat works even though if you are connected to a cellular network or WiFi access point and when network is down the app requires Bluetooth and WiFi to send and receive messages. Source code: GitHub Use these open-source encrypted messaging and VoIP Android apps and be sure no one else can see your messages. Because these apps make it confirm — everything you send can only be read by the person you sent it to. So which private messenger app are you going to use? And don't forget to share the information with your dear ones. And comment if you know any other similar messenger.