AlexCalc

AlexCalc is a scientific calculator with some neat features (note: also available as a web app at https://alexbarry.github.io/AlexCalc/ ):

nicely formatted (LaTeX) equation display. This avoids the need to count brackets to make sure the equation was entered correctly. Also includes LaTeX code generation.

complex number support, in rectangular or polar form (e.g. `3 + 4i` or `1 angle 90`)

variable storage (e.g. `123 -> x` then `3*x^2 - 4*x + 5 -> y`)

units in equations, and conversion (e.g. `1 inch * 3 ft to cm^2` or `sqrt(60 acre) - 100 ft`)

can enter input by button presses, typing, or copy/pasting. Button presses are all converted to plaintext input for easy copy/pasting.

equation display is simplified upon pressing enter. This means that when entering an equation, it is usually possible to look only at the LaTeX display and not the plaintext input: but when pressing enter, it will look nice. Redundant brackets are removed, including those that are needed for plaintext input (e.g. `(a + b)/(c + d)` can become "a + b" on the numerator and "c + d" on the denominator without brackets).

light/dark themes

previous input history can be accessed and edited by pressing "up" or "down" buttons.

previous inputs/vars/recently used units preserved when the app is closed

standard scientific calculator features, such as:

trigonometric functions: sin, cos, tan, arcsin, arccos, arctan

base 10 and natural logarithmic functions: log (base 10), ln (base e)

`e`, `pi` constants, and square root function

scientific notation input (e.g. `1.23E6` is 1.23 times 10^6)