By adding an iOS icon, anyone who decides to save your webpage to the home screen of their iPhone, iPad, or Android will see a nice app-like icon rather than an image of your page.
Here is a table of the current iOS icon sizes from Apple:
iPhone 6/7, iPhone SE | iPad / iPad Mini | iPad Pro | iPhone 6/7 Plus |
---|---|---|---|
120×120 | 152×152 | 167×167 | 180×180 |
For Android icons you’ll want to follow these specifications:
Android Regula | Android Hi-Res |
---|---|
1128×128 | 192×192 |
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Make the first apple one the 120 x 120.
If you don’t want to create all these images, you should at least create the larger resolution ones. That way they’ll look good on the hi-res devices.