Every single one of these apps has its own set of features and / or design, so pick the one that fits you the most.
1) My Script Calculator
This app lets you use your own handwriting (scribble work) in order to perform mathematical operations. Larger the screen, the better of course, it’s a nice feature. The app supports scratch-out gestures so you can delete symbols and numbers. It operates in both portrait and landscape while undo and redo functions are included. The app is free and it doesn’t support in-app purchases, which is great.
RealCalc calculator comes in a form of a regular calculator. This is a scientific calculator indeed. Features include traditional algebraic operations, unit conversions, percentages, 10 memories, trig functions and tons more. If you’re looking to bring the look of your good old scientific calculator on your smartphone screen, this might be just the thing for you. The app is free and just like My Script Calculator, it doesn’t support in-app purchases, though you can purchase RealCalc Plus if you want to support the developer and we suggest you do that. The app is truly great and if you need a great calculator with tons of options included you won’t regret spending about $3 on it (The “Plus” version).
CALCU is one of the better designed calculators. This is definitely one of the better looking calculator apps out there. The app lets you customize the keypad the way you want and you can change the theme of the app though the default one looks great. Features include gesture based control and navigation, calculation history, 2 keypad layout and lots more. The app is available for free in the playstore.
4) Mobi Calculator
Just like RealCalc, this app comes in 2 versions, the completely free and a paid one. The paid one will set you back about $3, again, just like RealCalc. The similarities between the apps don’t end there though, both have in them tons of options. Paid (Pro) version will give you the ability to store records of the history (up to 1000, unlike 50 which the free version offers) and the ability to edit expression with up to 5 lines on the screen (unlike 3 which the free version supports). Additional themes are also included so you can make it look the way you want.
This application comes in a rather simplistic look. The app is free though it offers in-app purchases and it does show ads, though they pop up only on secondary screens and if you’re online. The app itself packs basically everything you need inside. Features include: variables and constants support, highlighting of expressions, graphs of functions, history and many more. The app even offers a home screen widget.