Custom Domain not showing target Web App URL

💬 App Building
1
  1. My goal: To point Web App URL I build to Custom Domain
  2. Issue: After DNS is configured, it’s still showing [mydomain].retool.com
  3. Steps I've taken to troubleshoot: Updated DNS in my owned managed domain, change custom domain in brand section
  4. Additional info: Solution is built on retool cloud.
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Summary

On Retool Cloud, after configuring DNS and setting a custom domain in the Branding section, apps still resolve to the default [subdomain].retool.com URL instead of the intended custom domain.

AI Response

This is almost always a DNS record issue. Retool recently moved to a new CNAME target, so the custom domain must be configured as a CNAME record pointing exactly to custom-domain.retool.com. A common failure is a CNAME that points to a slightly wrong target (often caused by zero-width space characters when copy-pasting from Retool's email). Verify with 'dig CNAME +noall +answer' and confirm it resolves to custom-domain.retool.com, allow time for DNS to propagate (up to a few hours), then go to Settings > Branding and click Try again. Note a subdomain (e.g. apps.yourcompany.com) is recommended over an apex/root domain, which typically can't hold a CNAME record.

Sources

:bookmark: Setting up a custom domain for Retool Cloud (2026)
A July 2026 step-by-step guide for setting up a custom domain on Retool Cloud, including the current CNAME target (custom-domain.retool.com) and troubleshooting steps to verify DNS resolution.
:bookmark: Issue with updating your Custom Domain in Retool Cloud
A July 2026 staff post about the custom domain infrastructure change, flagging that CNAMEs pointing to the wrong target (e.g. from copy-paste artifacts) must be updated to map to custom-domain.retool.com.

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3

Hi @Gil_Sabado! Welcome to the Community forum :partying_face:

Thanks for your patience - just checking to see if your custom domain configuration is working now?

Please keep in mind that DNS changes can take up to 24 hours to propagate, so it is possible that you were not able to see the update right away.

If you are still having issues with setting up your custom domain, you should double-check the following:

  • Make sure your CNAME record points to custom-domain.retool.com
  • Don't use wildcard entries (*) for DNS
  • After fixing DNS, go back to Settings > Branding and click "Edit" for the Domain name, then click "Try again" to re-trigger verification.
  • Use this dig command in your command line to make sure your DNS is properly configured and propagated: dig yourdomain.com CNAME +noall +answer The output should contain your custom domain - if the last field of the output contains anything other than custom-domain.retool.com then you will know you set it up incorrectly. If so, delete the record and re-type the CNAME target manually.

Here is more info in our docs about setting up custom domains if you are interested!

Hope this helps - let me know if you still need assistance from here :slight_smile:

-Jen