Templates in WHMCS are essentially client-facing user interfaces. Themes are editable templates that you may personalize to fit your needs, as well as your company’s website and logo. Twenty-one debuted in WHMCS 8.4 and is now the default system theme for all new installs. 

What are WHMCS custom templates? 

Templates in WHMCS are essentially client-facing user interfaces. Themes are editable templates that you may personalize to fit your needs, as well as your company’s website and logo. Twenty-one debuted in WHMCS 8.4 and is now the default system theme for all new installs. Advantages of WHMCS Custom Templates 

Attractive Appearance and feel — Using a WHMCS custom template, you can simply improve the look and feel of your client area while also improving the browsing experience. 

Update Support — If you use a custom WHMCS template instead of the default template, your changes will be preserved and your settings will remain the same even if you upgrade to a higher version of WHMCS.