Accessible design helps everyone: the person on a bright street, the person with a broken trackpad and the person using a screen reader.
The short list
These checks catch most problems, and they take minutes once they are habit.
- Text contrast of at least 4.5:1, and 3:1 for large text
- Every control reachable and visible with the keyboard
- Touch targets of at least 44 by 44 points
- Motion that respects the reduced-motion setting