This is a perfect tool for daily calculations. Thanks to a big contrastive display and large colourful buttons one can use it even on devices with a small screen.
Because of tiny application size it launches really fast and it can run smoothly on low-end smartphones.
Last but not least it is completely free and without ads.

Available functions:
- addition
- subtraction
- multiplication
- division
- percentage
- square root
- memory
- constant mode