Threads your way
Keep a room flowing as one conversation or give each topic its own thread. Open threads beside the room and return to the ones you follow in a dedicated view.
Chat, calls, and collaboration.
Rooms for your projects, calls when typing won’t do, and tools that fit your community.
Host Chatto yourself for free, with every feature included, or let us run your server in the EU. Chatto Cloud is coming soon.
All the chat features you expect
Chatto is a full-featured alternative for your team or community. Rooms, direct messages, threads, reactions, file sharing, and voice and video calls: the tools you use every day, together on your own server.
Replies, reactions, DMs
Reply, react, mention someone, or take the conversation to a DM. Edit your messages, pin useful posts, and see who is online or typing.
Notices that stay visible
Keep announcements at the top of a room. Descriptions and pinned messages help newcomers catch up without asking everyone to repeat themselves.
Talk it through on a call
Start a voice or video call in a room. Share your screen and work through the thing that would take twenty messages to explain.
Pin a speaker, adjust individual volumes, and reduce background noise. The chat stays open alongside your call.
Audio, video, and screen sharing are end-to-end encrypted.
Your conversations stay yours
Every Chatto server is independent. Run your own for free, or let us host it for you.
Your data stays on your server
Messages, files, and member accounts live on your group’s own Chatto server. They are never shared with other servers, and nothing is public unless you make it so. The app connects you to each community separately.
Free to host yourself
Chatto is open source. Install it on your own hardware at no cost, with every feature included. It’s the same server we run in the cloud, so you can switch between the two with a backup and restore.
Or let us host it
Chatto Cloud is coming soon. We run your server in Europe and take care of updates and backups. ChattoCorp GmbH operates it from Germany, under European data protection law. More regions are planned for 2027.
Bring your agents into the conversation
Send build updates to a project room or ask an assistant to find a decision in a long thread. Your AI tools join the conversation on your own server, with the access you give them and the model provider you choose.
Clearly identified bot accounts
Bots carry a BOT badge and can join rooms, DMs, and threads. You choose their permissions and can revoke their access. A bot can never do more than its owner.
Bots that wait to be asked
Limit a bot to the threads it’s pulled into: someone mentions it, sends it a DM, or it starts the thread. It answers there and never sees the rest of the room.
See what a bot can do
Every bot has an owner you can message and a plain-language list of what it’s allowed to do, visible to every member. New bots start with no permissions at all.
Bring your own AI assistant
Connect a compatible AI assistant through MCP and approve its access in your browser. It can search conversations and contribute replies within your account’s permissions.
Webhooks and integrations
Post alerts into rooms with incoming webhooks (Grafana works out of the box), get a signed webhook when something happens, or build your own bot with Chatto’s public API and the @chatto/client TypeScript package. Give each tool its own access key.
You choose who gets access
Connected assistants receive the data they read and may send it to a model provider. Choose providers you trust; Chatto checks access on every request. Bot accounts and MCP are still experimental, and MCP has to be switched on for your server.
Messages, files, and previews
Share a quick note, a code example, or a video. Keep the context and the conversation together.
Markdown or a visual editor
Use Markdown or the visual editor, with formatting tools in both. Add tables, code blocks, and diagrams when plain text is not enough.
Share files, images, and videos
Drag or paste files into a message, add accessible descriptions, and follow upload progress. Find shared files again in the room’s Files panel.
Preview files in the chat
Zoom into images, read documents, and play videos without losing the conversation. Videos can adapt their streaming quality to your connection.
Upload larger videos
On supported devices, Chatto can compress a video before upload. Your original file stays unchanged.
Find a message and its context
Search a room, a server, or your connected communities. Filter by person, date, or phrase, then jump back into the original conversation.
Search must be enabled on the server. Results respect your current access permissions.
Notifications you control
Keep replies, mentions, and reactions in one feed until you dismiss them. Choose what you hear about for each room, group, or server, and use Do Not Disturb when you need quiet.
Get push notifications on supported desktop and mobile browsers, even when Chatto is not in front of you.
Tools for running your community
Give moderators the right tools, control access to private spaces, and make the server recognizable as yours.
Roles and permissions
Decide who can read, post, upload files, or start calls. Set roles across the server and adjust permissions for room groups or individual rooms.
Moderation and slow mode
Slow down busy rooms, remove messages, and suspend access when needed. Archive finished rooms and manage member accounts from one place.
Sign-in and single sign-on
Chatto supports email, social sign-in, and your organization’s identity provider. Single sign-on and group-based access are included when you self-host and on selected Cloud plans.
Invite-only spaces
Use invitation codes to control who joins your server. Invite existing members into private rooms when they need access.
Your name, logo, and welcome
Give the server your own name, logo, banner, and welcome message. Member profiles help people get to know each other.
Administration with an activity log
Manage your server from the admin dashboard and review changes in the event log. Activate additional admin powers only when you need them.
One app. All your communities.
Switch between your team, hobby group, and favorite community in the same app. Each keeps its own independent server.
In your browser or on your phone
Use Chatto right in your browser. On your phone, you can add it to your home screen so it’s easy to get back to your conversations. We’re working on iOS and Android apps too. You’ll be able to download them in early 2027.
Desktop apps
Download Chatto for macOS, Windows, or Linux. Automatic updates, notifications, and screen sharing are built in.
Keyboard shortcuts
Jump between rooms with the quick switcher or return straight to the newest messages. Shortcut help is always close by.
Colors, contrast, and 22 languages
Choose the colors, contrast, and visual style that suit you. Pick your preferred language independently of everyone else.
Discover other communities
Browse communities recommended by your server and connect to the ones that interest you.
Bring your community along
Chatto is ready to import your existing community. On Enterprise plans, we help you plan and run the migration.
Try Chatto in our public community
Join Chatto HQ to try the app and talk to us. Explore the upcoming Cloud plans for a server of your own.