Miluven

Miluven is a chat app that keeps your conversations to yourself.
Messages are end-to-end encrypted with OMEMO: encrypted on your phone,
decrypted only on your contact's. The server passes them on and cannot
read them.

Built on an open standard
Miluven speaks XMPP, an open and federated standard in use since 1999.
Miluven runs no chat server and hands out no accounts: sign in with the
address you already have, or host a server yourself. You can reach
anyone with an XMPP address, on any server, in any app that speaks it,
and you can leave whenever you like.

Everything you expect from a chat app
One-to-one chats and group chats, photos, videos, files and voice
messages, audio and video calls, read markers, typing notifications,
reactions, multiple accounts and multiple devices. Verify a contact's
keys by scanning a QR code.

Task lists and polls
Share a task list in any chat: everyone can tick a task off, or claim
one beforehand so the others see who will do it. Or ask the group a
question with a poll, up to ten options, single or multiple answers,
with an optional closing time and anonymous votes. Titles, tasks,
questions and options are encrypted on your phone before they are
stored, so the service that holds them cannot read a word.

Small things that help
Type a slash in the message box to reach task lists, polls and reusable
templates, so the weekly groceries take one tap. Hold the send button
to send a message later, and cancel it while it waits. Make stickers
out of your own photos; they never leave your phone except as the
picture you send.

Make it yours
Put a wallpaper behind each conversation, a photo, a colour or a
pattern, with a dim slider so text stays readable. Search for GIFs from
the chat, optional and with your own GIPHY key.

No ads, no tracking
No analytics, no crash reporting, no advertising, nothing sold. Two
optional features involve another service and say so before you use
them: polls and task lists use the Miluven service, which only ever
sees encrypted text, and GIF search sends your search terms to GIPHY
with a key you supply. Choose Strict mode on first start and the app
talks to your own server and nothing else.

Free software
Miluven is a fork of Conversations, the free XMPP client for Android,
and stays under the same GPLv3 licence.