Custom Domain not showing target Web App URL

💬 App Building
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  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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