Soulver has some basic trig functions, currency and unit conversion, and logical operators, and you can save your calculations to iCloud or Dropbox or send them as HTML-formatted emails.

RedCrab is a scientific and statistics calculator with a full-screen formula editor. The portable calculator supports exponential and trigonometric functions and many statistical calculations.

Most calculators default to degree mode, which can lead to incorrect results when evaluating trigonometric functions with radian inputs.

The iPhone's scientific calculator provides exponential, logarithmic and trigonometric functions. It even has some hidden functions that reveal themselves if you hit the button that reads ‘2nd'.

The native Calculator app on macOS may look like a basic tool, but it's much more capable than most people think, especially if your Mac is running macOS Sequoia. Here are some hidden features of ...