I haven't seen any other apps that display all three datums in a 1x1 icon. But an extended search may locate such an app. Ten quality minutes with Google should answer that. For that matter, you may wish to contact the author of your old app and see if he will update it to work with your current phone?
Alternatives? Elixir widgets is very good. Certainly a 1x1 widget for any one parameter. I'm just not aware of the app being able to put three items into a 1x1 widget. Personally, I like to have these items in the status bar. And to that end have two icons display these three items. An xposed module to display the CPU temperature. And the Cool tool app to display processor load /RAM as a second icon.