Floating Calculator - Popup Calculator is an Android application developed by Radiant.aj. As its name suggests, this app is a calculator that runs in a windowed environment and floats above other applications. The calculator window can be moved around the screen and re-sized as per your requirement. The app is free and falls under the category of Utilities & Tools.

The calculator window can be minimized into the notification area, and the app has a small footprint. It has a simple and familiar interface of desktop calculator, and the font size can be changed. The app also has memory functions like MS, MR, MC, M+, M-, percentages, and mathematical functions like square root, 1 over x, round down, p. The app also has a history of calculations with up to 5 items, and users can hold and restore items. It has standard and scientific modes, and users can swipe left/right to switch views. Backspace and clear functions are switched automatically, and users can hold down the backspace button to clear the display at any time.

Overall, Floating Calculator - Popup Calculator is an excellent app for those who need a calculator while using other applications. The app is user-friendly, and the features are well-organized. The app is available for free, and users can download it from the Google Play Store.