Communication Apps

Signal

Signal Private Messenger

Privacy is possible. Signal makes it easy.

Using Signal, you can communicate instantly while avoiding SMS fees, create groups so that you can chat in real time with all your friends at once, and share media or other files all with complete privacy. Signal’s servers never have access to any of your communication and never store any of your data.

★ Say Anything. Signal uses an advanced end-to-end encryption protocol to keep your conversations private. Every message, every call, every time.

★ Open Source. Signal is Free and Open Source, enabling anyone to verify its security by auditing the code. Signal is the only private messenger that uses open source peer-reviewed cryptographic protocols to keep your messages and calls safe.

★ Be Yourself - Signal uses your existing phone number and address book. There are no separate logins, usernames, passwords, or PINs to manage or lose.

★ Group Chat. Signal allows you to create encrypted groups so you can have private conversations with all your friends at once. Not only are the messages encrypted, but the Signal server never has access to any group metadata such as the membership list, group title, or group icon.

★ Fast. The Signal protocol is designed to operate in the most constrained environment possible. Using Signal, messages are instantly delivered to friends.

★ Speak Freely - Make crystal-clear phone calls to people who live across town, or across the ocean, with no long-distance charges.

Read More

Briar

Secure Messaging, Anywhere

Briar is a messaging app designed for activists, journalists, and anyone else who needs a safe, easy and robust way to communicate. Unlike traditional messaging tools such as email, Twitter or Telegram, Briar doesn’t rely on a central server - messages are synchronized directly between the users’ devices. If the Internet’s down, Briar can sync via Bluetooth or Wi-Fi, keeping the information flowing in a crisis. If the Internet’s up, Briar can sync via the Tor network, protecting users and their relationships from surveillance.

Read More

Conversations

An encrypted, user friendly XMPP instant messaging client optimized for mobile

Easy to use, reliable, battery friendly. With built-in support for images, group chats and e2e encryption.

Design principles:

  • Be as beautiful and easy to use as possible without sacrificing security or privacy
  • Rely on existing, well established protocols
  • Do not require a Google Account or specifically Google Cloud Messaging (GCM)
  • Require as few permissions as possible

Features:

  • End-to-end encryption with either OMEMO or OpenPGP
  • Sending and receiving images
  • Intuitive UI that follows Android Design guidelines
  • Pictures / Avatars for your Contacts
  • Syncs with desktop client
  • Conferences (with support for bookmarks)
  • Address book integration
  • Multiple accounts / unified inbox
  • Very low impact on battery life

Conversations makes it very easy to create an account on the conversations.im server. Using that server comes with an annual fee of 8 Euro after a 6 month trial period. However Conversations will work with any other XMPP server as well. A lot of XMPP servers are run by volunteers and are free of charge.

XMPP Features:

Conversations works with every XMPP server out there. However XMPP is an extensible protocol. These extensions are standardized as well in so called XEP’s. Conversations supports a couple of those to make the overall user experience better. There is a chance that your current XMPP server does not support these extensions. Therefore to get the most out of Conversations you should consider either switching to an XMPP server that does or - even better - run your own XMPP server for you and your friends.

These XEPs are - as of now:

  • XEP-0065: SOCKS5 Bytestreams (or mod_proxy65). Will be used to transfer files if both parties are behind a firewall (NAT).
  • XEP-0163: Personal Eventing Protocol for avatars
  • XEP-0191: Blocking command lets you blacklist spammers or block contacts without removing them from your roster.
  • XEP-0198: Stream Management allows XMPP to survive small network outages and changes of the underlying TCP connection.
  • XEP-0280: Message Carbons which automatically syncs the messages you send to your desktop client and thus allows you to switch seamlessly from your mobile client to your desktop client and back within one conversation.
  • XEP-0237: Roster Versioning mainly to save bandwidth on poor mobile connections
  • XEP-0313: Message Archive Management synchronize message history with the server. Catch up with messages that were sent while Conversations was offline.
  • XEP-0352: Client State Indication lets the server know whether or not Conversations is in the background. Allows the server to save bandwidth by withholding unimportant packages.
  • XEP-0363: HTTP File Upload allows you to share files in conferences and with offline contacts. Requires an additional component on your server.

Read More

K-9 Mail

Full-featured email client

E-mail client supporting multiple accounts, POP3, IMAP and Push IMAP. Can do OpenPGP encryption if OpenKeychain is installed. Settings and account configurations can be exported so that they can be imported easily if you are switching packages/signatures: a file manager will need to be already installed to achieve this.

Read More