I have learnt the use of even numbers for font sizes, spacings. The 8 point rule. But still not being able to figure out why Apple still uses odd number for font sizes, spacings and paddings.


2 Answers 2


Using even numbers and an 8px grid provides one easy way to help designers create harmonious spacing. They are not strictly necessary—just a helpful tool. There's nothing magic about even numbers and 8px units, and it's okay to not use them.

  • This doesn't answer the question about why Apple use ODD numbers though.
    – JonW
    Jun 26, 2023 at 8:50
  • 1
    @JonW They use a combination of even and odd numbers, so one can conclude their font sizes are based on what works/looks best regardless of whether the number is odd or even. See developer.apple.com/design/human-interface-guidelines/…
    – Chloe
    Jun 26, 2023 at 15:04

Fun fact, humans love odd numbers (<-- UX Collective article). Think about it, 7 wonders of the world, trinity in everything we can define. I've always found this to be a fun detail about humans.

I couldn't find the original article that taught me this (probably, QuickSprout's Complete Guide on the Psychology of a Consumer), but I can't dig that up right now. UX Collective's article will do, the results are the same.

UX Collective article on what types of numbers we like


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