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If you’re using Authsignal’s pre-built UI for your authentication flows, you can add your own custom domain.

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Add your custom domain to the Authsignal Portal

Decide on the subdomain you want to use.
For example, if your app is hosted on example.com, you might want to use auth.example.com as your custom domain.
Now, head to the Custom Domains page in the Authsignal Portal. Enter your desired subdomain and click Add. You will be prompted to add a CNAME record to your DNS provider. Once Authsignal detects that the CNAME record has been added, you will see a Valid configuration message. Click Activate to get the pre-built UI to use your custom domain.
You must activate your custom domain before it will take effect.
Custom domain activated

An active custom domain in the Authsignal Portal.