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You can connect your own domain (like blog.example.com) to any public site or service running on your Zo. This gives your projects a professional, branded URL instead of the default yoursite-handle.zocomputer.io.
Custom domains are available on paid plans. See pricing for plan limits.

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How it works

When you add a custom domain, we:
  1. Register your domain with Cloudflare’s edge network
  2. Automatically provision and manage a TLS certificate for HTTPS
  3. Route all traffic from your domain to your service
The entire process typically completes within 15 minutes after you’ve configured your DNS.

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Adding a custom domain

1

Open Sites

Navigate to the Sites page in your Zo and find the service you want to add a domain to.
2

Add domain

Expand the service details and click Add domain in the Custom Domains section. Enter your domain (e.g., blog.example.com).
3

Configure DNS

Add a CNAME record in your domain’s DNS settings:
TypeNameTarget
CNAMEblog (or @ for subdomains)cname.zocomputer.io
If you’re using Cloudflare for your domain, set the proxy status to DNS only (gray cloud icon) when adding the CNAME record.
4

Wait for verification

Once your CNAME is configured, Zo will automatically detect it and provision your TLS certificate. This usually takes 1-15 minutes.

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Domain status

Your custom domain goes through these states:
StatusDescription
Pending CNAMEWaiting for you to add the CNAME record
Pending SSLCNAME verified, TLS certificate being provisioned
ActiveDomain is live and serving traffic
ErrorSomething went wrong (check DNS configuration)
You can click Verify now to manually trigger a verification check.

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Limitations

  • Subdomains only: You must use a subdomain like blog.example.com or app.example.com. Apex domains (like example.com) are not supported because they cannot have CNAME records.
  • Plan limits: The number of custom domains you can add depends on your plan:
    PlanCustom Domains
    Free0
    Basic3
    Pro5
    Ultra10
  • One domain per service: Each custom domain can only point to one service at a time. You can transfer a domain to a different service without re-verification.

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Troubleshooting

DNS changes can take time to propagate. Wait a few minutes and click Verify now. You can also check your CNAME record using a DNS lookup tool:
dig CNAME blog.example.com
The result should show cname.zocomputer.io as the target.
TLS certificate provisioning typically takes 1-15 minutes. If it’s been longer than an hour, check:
  1. CAA records: If your domain has CAA DNS records, ensure they allow digicert.com and letsencrypt.org.
  2. Conflicting proxies: If your domain is already proxied through another Cloudflare zone, you may need to disable that proxy first.
If you see certificate warnings after the domain shows as Active:
  1. Wait a few more minutes for certificate propagation
  2. Try a hard refresh (Cmd+Shift+R or Ctrl+Shift+R)
  3. Try an incognito/private browser window
If your domain stops working:
  1. Verify the CNAME record is still configured correctly
  2. Check that your service is still running
  3. Remove and re-add the domain if the issue persists

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Removing a custom domain

To remove a custom domain, expand the service details, find the domain in the Custom Domains section, and click the delete button. The domain will be immediately removed and traffic will stop routing to your service.
If you delete a service, all custom domains attached to it are automatically removed.