[lexicality]

You can't zoom in normal apps.

[gorena]

In apps properly coded against the UIFont APIs, you can: https://developer.apple.com/library/prerelease/ios//document...:

[silon7]

That's why web is/was better for many things, especially when you could increate fonts only (unfortunately, many sites have bad css that breaks this).

[pjc50]

That's a deficiency in native apps, not something to be taken away when it does exist for web apps.