Chat
Keep the conversation together.
Channels, direct messages, threads, and shared files. Move from a message to a call or a Live room when talking is easier.
Voice and video are optional.
Chat and work together. Run it yourself.
Channels, threads, tasks, shared mail and data. One installation, many servers. Free software on infrastructure you control.
MIT licensed. Cloudflare or your VPS. No seat fees.
Four groups. One team.
Less switching. More shared context.
Chat, Tasks, Mail, and Data bring the everyday work together, with the same people and permissions.
Tasks
Know what happens next.
Turn plans into shared boards with priorities, due dates, checklists, and dependencies. Give each task a responsible teammate and a place to discuss it.
Mail
An inbox the team can share.
Receive and reply from your own domain. Keep email conversations and internal notes together, with access for the people who need it.
Connect an email domain to enable Mail.
Data
Make knowledge easy to find.
Organize records in tables, boards, lists, and calendars. Keep documents and canvases alongside them, and bookmark what matters to you.
AI teammates
Bring an agent into the conversation.
Give an agent a profile, talk to it in a channel or direct message, and ask it to read or create tasks. Your team decides who can use and configure agents.
Meet the agentsApps
Want more?
Build tools around the way your team works. Use shared records to build the internal tools your community needs.
Built-in Apps · Available now
Your data. Your tools.
Turn workspace records into shared lists, tables, and metrics: a client directory, a sales console, or a project dashboard. Choose what each app can show or change, then publish it to the right roles.
Create and publish these tools with the built-in Apps editor.
Explore built-in AppsFree stays complete
Your team. Your history. Your choice.
Invite everyone.
No seat fees. Your team can grow without buying access for each person.
Keep your history.
No retention tier. Conversations stay searchable until you choose to delete them.
Own your workspace.
MIT software. Run independent installations with isolated servers on Cloudflare or your VPS.
L4 adds no member, history, mailbox, or record tiers. Your infrastructure and connected providers determine capacity and usage costs.
Ways to run
Choose where to run L4.
Run on your Cloudflare account, or use celld on your VPS. In either case, you operate the installation and own its data.
Available now
Run in your Cloudflare — Free
Connect your Cloudflare account, deploy an installation, then create isolated servers. Each server has its own database, files and realtime runtime.
- Full MIT product, including all five apps and agents
- No seats, history tiers, or reduced open-source edition
- You pay Cloudflare directly for infrastructure usage
Docker Compose · Coolify
Run on your VPS
The same server logic on celld. Keep chat, tasks, documents and files on your own machine. Connect optional calls, AI and mail providers when you need them.
- Local accounts and your own domain
- One private runtime and database per server
- Separate backups and operator-controlled updates
