This app was mentioned in 8 comments, with an average of 1.50 upvotes
I use Simple Calculator, it has a customizable widget and it's good if you don't want something complicated.
I don't have dialer but may be able find one. But Calc I'm using https://play.google.com/store/apps/details?id=com.simplemobiletools.calculator with coverscreen os of course. You can customize the colors of the Calc widget to ur liking also.
Simple calculator is good. Also, it's open source. Check out https://www.simplemobiletools.com/ for info on the project
https://f-droid.org/en/packages/com.simplemobiletools.calculator/
https://play.google.com/store/apps/details?id=com.simplemobiletools.calculator
Simple Calculator is almost exactly the same as old Google calculator
https://play.google.com/store/apps/details?id=com.simplemobiletools.calculator
If you are looking for an open source one, then get this : https://play.google.com/store/apps/details?id=com.simplemobiletools.calculator
Wrong link, should be https://play.google.com/store/apps/details?id=com.simplemobiletools.calculator