Brian Alexander

Adds the current page’s template name to the admin bar.
Because this plugin reveals potentially sensitive information about the active theme, it is recommended for development environments only, and should not be enabled on a production site.

What Template

Adds the current page's template name to the admin bar.

Dave Kellam

Don’t Mess Up Prod helps developers and content managers quickly identify which environment they’re working in by displaying a colored indicator in the WordPress admin bar. Hopefully this prevents messing up production 😅
<a href="https://github.com/davekellam/dont-mess-up-prod" rel="nofollow ugc">Active development is on Github</a>

Don't Mess Up Prod

Displays a colored environment indicator in the admin bar.

What Template vs Don't Mess Up Prod