What is it?

It's like VS Code, but it sits on a server, and is thus reachable from any browser or phone whenever. You get a real Linux system: install packages, edit system files, run agents, build projects - and that state survives restarts. The runtime is a container, so durable state comes from one volume mounted at /data (see Persistence).

The environment

• You are user, a normal account with passwordless sudo - root whenever you need it.
• cron runs, so crontab -e schedules jobs.
• For incoming network requests, see webhooks.
• Reach it over SSH, or connect your AI agent to it.
• Outbound mail on port 25 will not work on most hosts. Cloud providers block it to limit spam, and Hetzner - which Composery Cloud runs on - blocks 25 and 465 by default. Port 587 is not blocked, so send through an authenticated relay (Resend, Postmark, SES, your own provider) rather than talking SMTP directly. This is the provider's policy, not Composery's, and no setting here changes it. On your own Hetzner account the block can be lifted by a limit request once the account has some history and a paid invoice.

Your changes persist across restarts through the persistence daemon, which writes only your deltas to /data. Configure the runtime with environment variables.

Running Composery

• Self-host it - deployment guides for Render, Railway, DigitalOcean, Fly.io, Koyeb, a VPS, Kubernetes, and other platforms (Coolify, Dokploy, Elestio, ...).
• Composery Cloud - the hosted offering at composery.io, running the same image, but managed for you.