A few rules every screen follows:
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Body text is at least 17 points. In the app it grows with your phone’s text size; on the website you can zoom in as far as you need.
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Buttons are at least 52 pixels tall, so they are easy to tap.
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Color never carries a meaning alone: a status always has an icon and a word (On track, Due soon, Overdue).
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A screen reader hears each row of the printable charts in words: the day she was bred and the day she is due.
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There is a light and a dark look.