Onboarding describes some features

3D touch options on the bottom menu

Switching to light mode

Drag and drop to save result to memory

Spelling out numbers

Rounding off result using button on top right

Switching to scientific mode

Settings and about

Change app theme color

Selecting language pre login, space themed

Splash screen and login/signup screen

Splash screen and pre-login onboarding slides

Full chat bot onboarding