Just curious about whether it is iPHONE, IPHONE, or just never written in all capital letters. Is there a style guide or something on this issue?


3 Answers 3


As initially mentioned by Neil, the Apple Publications Style Guide is the place to look.

From page 34:

  • What to capitalize: Follow these rules when you use title-style capitalization.
    Capitalize every word except:
    • Articles (a, an, the), unless an article is the first word or follows a colon
    • Coordinating conjunctions (and, but, or, nor, for, yet, and so)
    • The word to in infinitives (How to Start Your Printer)
    • The word as, regardless of the part of speech
    • Words that always begin with a lowercase letter, such as iPod and iTunes
    • Prepositions of four letters or fewer (at, by, for, from, in, into, of, off, on, onto, out, over, to, up, and with), except when the word is part of a verb phrase or is used as another part of speech (such as an adverb, adjective, noun, or verb).

      Starting Up the Computer
      Logging In to the Server
      Getting Started with Your MacBook Pro

That is, the i in words like iPod and iTunes (and iMac, iPhone, iPad, etc.) are never capitalized.

I don't believe that, given a choice, Apple ever uses all caps, although the only specific rule I've found is on page 33:

Don’t use all caps for emphasis.

  • 1
    damn, page 33! did you read the other 32 pages?!
    – cregox
    Commented May 31, 2011 at 22:06
  • @Cawas - It's 224 pages in total; while I haven't read all of them, I do refer to the Guide enough that I keep a local copy around for quick searching.
    – Dori
    Commented May 31, 2011 at 22:55

There is an Apple Publications Style Guide, and it says to not use all caps for emphasis. (Apple Style Guide, PDF)

I can't recall ever seeing all-capital letters in an Apple publication. In the design world, all-capital letters are generally considered hard to read and, in most fonts, ugly, so it's my guess that Apple would avoid the use of all-caps.

  • I actually have an interesting example. Take a look at the bottom left hand side of apple.com/ipod, and see also apple.com/ipod/red. It's their only product name that is pure caps. Commented May 31, 2011 at 17:16
  • 2
    @VxJason - that's because Apple didn't name it; they're just licensees. Wikipedia has a good article about the (PRODUCT)RED brand if you want to know more.
    – Dori
    Commented May 31, 2011 at 23:01
  • Heh. Only on a Mac site would people be concerned with stuff like this... how awesome. :) Commented May 31, 2011 at 23:07

The only official name is "iPhone". If you are putting it in capitals, it is just a matter of choice whether the initial i is uppercase or lowercase. Personally, I think it looks better as "iPHONE".

  • I suppose it is ultimately a matter of choice, but since Apple gives you guidance on this sort of thing as noted above, it would seem strange not to follow it.
    – calum_b
    Commented Jun 1, 2011 at 16:41

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