Keep it running

Two different things can stop your work: closing the browser tab (harmless) and the cptr process dying (not). Here's how to make the second one stop happening.

What survives what

Event	What happens
You close the tab / lose signal / lock your phone	Nothing stops. Terminals, agent tasks, and sessions run server-side; reconnect from any device and pick up where you left off.
The cptr process exits, or the host reboots or sleeps	Sessions end. Your files, chats, and config are safe on disk, but running terminals and in-flight agent work stop.

So the job is: start cptr at boot, restart it if it crashes, and stop the machine from sleeping.

Start at boot

Use the absolute path to cptr in your virtualenv (find it with which cptr while the venv is active); boot-time services don't have your shell's PATH.

macOS (launchd)

Create ~/Library/LaunchAgents/com.openwebui.cptr.plist:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>Label</key>
    <string>com.openwebui.cptr</string>
    <key>ProgramArguments</key>
    <array>
        <string>/Users/you/venvs/cptr/bin/cptr</string>
        <string>run</string>
        <string>--headless</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>KeepAlive</key>
    <true/>
</dict>
</plist>

Load it now (and automatically at every login):

launchctl load ~/Library/LaunchAgents/com.openwebui.cptr.plist

--headless stops cptr from trying to open a browser window.

Linux (systemd user service)

Create ~/.config/systemd/user/cptr.service:

[Unit]
Description=Open WebUI Computer

[Service]
ExecStart=/home/you/venvs/cptr/bin/cptr run --headless
Restart=on-failure

[Install]
WantedBy=default.target

systemctl --user enable --now cptr
loginctl enable-linger $USER   # keep it running when you're not logged in

Windows (Task Scheduler)

Task Scheduler → Create Task: trigger At log on, action Start a program with the full path to cptr.exe (e.g. C:\Users\you\venvs\cptr\Scripts\cptr.exe) and arguments run --headless. Under Settings, enable "If the task fails, restart every ...".

Docker

Use a restart policy; Docker brings the container back after crashes and reboots:

services:
  cptr:
    image: ghcr.io/open-webui/computer:latest
    restart: unless-stopped

(or docker run --restart unless-stopped ...). Full setup: Docker install.

Stop the machine from sleeping

A sleeping host serves nothing.

• macOS: System Settings → Battery → Options → Prevent automatic sleeping when the display is off (applies on the power adapter). Or ad hoc from a terminal: caffeinate -s keeps the Mac awake while it runs.
• Linux: desktop distros suspend by default. Disable automatic suspend in your desktop's power settings, or set IdleAction=ignore in /etc/systemd/logind.conf.
• Windows: Settings → System → Power → set "When plugged in, put my device to sleep" to Never.
• Laptops with the lid closed: closing the lid sleeps the machine regardless of the above. Keep it plugged in and set "do nothing" on lid close (macOS needs the prevent-sleep setting above; Linux: HandleLidSwitch=ignore in logind.conf; Windows: lid-close action in power settings).

Verify

Reboot the machine, don't touch it, and open Computer from your phone. If it loads, you're done: curl http://127.0.0.1:8000/api/health on the host confirms the service is up. If something's off, check troubleshooting.