What size should apple-touch-icon.png be for iPad and iPhone?

Question

Are Apple touch icons bigger than 60x60 supported, and if so, what dimensions should I use for the iPad and iPhone?

Answer 1

TL;DR: use one PNG icon at 180 x 180 px @ 150 ppi and then link to it like this:

Details on the Approach

As of 2020-04, the canonical response from Apple is reflected in their documentation on iOS.

Officially, the spec says:

• iPhone 180px × 180px (60pt × 60pt @3x)
• iPhone 120px × 120px (60pt × 60pt @2x)
• iPad Pro 167px × 167px (83.5pt × 83.5pt @2x)
• iPad, iPad mini 152px × 152px (76pt × 76pt @2x)

In reality, these sizing differences are tiny, so the performance savings will really only matter on very high traffic sites.

For lower traffic sites, I typically use one PNG icon at 180 x 180 px @ 150 ppi and get very good results on all devices, even the plus sized ones.