Kallisti Open Kallisti

Everything it does

Voice, video and chat for your group, on a server that belongs to you. Here is all of it, from talking in a channel to running your own server.

A voice channel with people in it and its chat

Voice

  • Join with one click. Voice channels are always open; click one and you are in.
  • Push-to-talk or voice activity, and hold-to-talk on phones.
  • Noise suppression (RNNoise or DeepFilterNet) and echo cancellation, each with a switch.
  • A volume for each person, join and leave sounds, and a quality icon with connection stats.
  • Music mode: stereo at 128 kbps, without the filters made for speech.
  • Listen-only channels for talks and radio. built-in server
  • Recording for moderators: one file for each speaker. built-in server
Four people live with their cameras in a voice channel's stream grid, its chat below

Video and streams

built-in server All of video needs Kallisti's own voice server.

  • Go Live with your screen or your camera, and change the quality while you are live.
  • Several streams at once, side by side in a grid or one big in focus.
  • Stream from OBS (or any WHIP encoder) straight into your voice channel.
  • Previews of live streams, so you see what is on before you watch.
  • Mumble users hear the stream in their channel.
A text channel with replies, reactions, a link preview and code

Chat

  • Text channels with history and remembered read state, sorted into categories. categories: built-in server
  • Threads for side conversations.
  • Replies, reactions and mentions, also @here and @everyone; reply without a ping.
  • Pictures, files, video and audio that play in the chat, and link previews.
  • Formatting, code and spoilers; long messages fold up.
  • Pins, message links and search with filters.
  • Direct messages.
  • Invite-only channels with invite links. built-in server
  • Ctrl+K finds any channel; mute channels, block people.
A chat with large fox stickers and the sticker picker open
Stickers: neofox by Volpeon, CC BY-NC-SA 4.0.

Emoji, stickers and profiles

  • Your server's own emoji, suggested as you type :name.
  • Personal emoji that go with you to every server; take one from someone's message.
  • Big emoji when a message is only emoji.
  • Stickers: large pictures, also animated, sent from their own picker and found by name or emoji. built-in server
  • Your server's sticker packs, added by moderators, many at once.
  • Avatars, a status with emoji, and a bio.

Log in with

  • A Kallisti account
  • Your fediverse account: Mastodon, Pleroma, Akkoma, GoToSocial
  • As a guest, if the server allows it

Accounts

  • Log in with your fediverse account, link it to an existing account, and show your verified handle.
  • Guests can drop in without an account; the server can make them read-only.
  • One account on several devices: voice on one, chat on all. built-in server
  • Mumble apps log in with the same account and password.

Moderators can

  • Mute, move, time out, kick and ban
  • Delete messages, also many at once
  • Turn on slow mode
  • Record a voice channel

Moderation

  • Admins and moderators, made with one click in the app, and moderators for single channels.
  • Slow mode, a word and link filter, and limits for new accounts. built-in server
  • A captcha at sign-up, with no third party. built-in server
  • Bans that also hold for Mumble clients.
Kallisti on a phone Kallisti in the light theme

Phone and desktop

  • In the browser, nothing to install.
  • On your phone: install it from the browser as an app, with push notifications and an unread badge. built-in server
  • Apps for macOS, Windows and Linux, with native notifications; the desktop app also connects to plain Mumble servers.
  • Dark or light, as you like it.

Your own server, in three commands

git clone https://github.com/lambadalambda/kallisti && cd kallisti
printf 'DOMAIN=chat.example.org\nSUPERUSER_PASSWORD=%s\n' "$(openssl rand -hex 16)" > deploy/.env
docker compose -f deploy/compose.yml up -d --remove-orphans

Your own server

  • One Docker setup with the voice server and HTTPS in it, or run it in front of the Murmur you already have.
  • Behind your own proxy, with Cloudflare and no port 80, with systemd, or on Kubernetes.
  • Your messages stay on your machine, with a daily database backup.
  • Free software, in the public domain.

How to install it →

Mumble users keep

  • Their client (Mumble 1.3 or newer)
  • Whispering, linked channels, positional audio
  • Rights (ACLs), groups, certificates

For Mumble users

  • Friends without Mumble join the same channels from a browser.
  • Text channels show up as channels, and what was said there arrives when they come in.
  • Pictures, files and replies reach them as well.
  • A real certificate, so the client connects without a trust question.

built-in server These features need Kallisti's own voice server. In front of an existing Murmur, everything else works. What works where →