★★★★★Ret Robertson2 Nov 2026
I've tried several calculators and this is the best. Only a few dollars to get the pro version and support the developers. You'd pay a lot more for a physical calculator at the shops that performs as well as this one, so they're not asking too much. EDIT: I've been using this since May 2014 & it's now Nov 2026 & I've since tried a few others (belonging to friends, both using Android & iPhone) & nothing is better than this one! So, I give many thanks & 100 stars to the developer/s!