How is iOS pronounced?

Yeah, but they had a pretty good, consistent run before that with Systems 1 through 7.

That’s eye-ore. Who works for Dr.Frankensteen.

lightning crashes, horses whinny

I attended Apple Developer 1999 and saw St Steve, live on stage, introduce OX-X (and took home the highly preliminary development edition) and I heard him say, in the flesh, O-S-ten.

Everyone does indeed mispronounce it.

That’s FRONK-en-steen.

The name is a reference to the greek goddess of dawn, Eos.

It’s pronounced Hfuhruhurr.

the vast majority of responses here are iterating the term “iOS” as initials … and this may very well be the most accepted within your circle (society dictates 'n discriminates). whereas, i contend the term should be deemed as a “true” acronym … in other words, omar’s first response … rather than his corrected reply.

and, for the record, when a person searches for “acronyms” … usually what is labeled as an acronym may not be a true acronym … they may simply be initials. a true acronym is stated as a word. in other words, in oratorial conversation, SWAT (Special Weapons And Tactics) is pronounced as one syllable … it is never pronounced as initials (or, in this case, four syllables) … same for SEATO 'n NATO … both being true acronyms. whereas, IBM (International Business Machines) is pronounced as three syllables … not “ibm” (one syllable) and, therefore, i maintain IBM would not be a true acronym. juxtapositionally, googling IBM … every search-engine claims IBM to be an acronym.

just a few true acronyms:
radar … stands for RAdio Detection And Ranging
nabisco … stands for NAtional BIScuit COmpany
sonar … stands for SOund NAvigation and Ranging
lidar - LIght Detection And Ranging
flopsy … stands for FLip-flOP SpectroscopY

anyway … i propose omar’s first answer to be acceptable … and should be enunciated as “eye-ohs”. perhaps steve-jobs had simply pronounced it as initials i-o-s [whether it stands for iphone-operating-system or internet-operating-system or input/output subsystem] … for others to understand/attenuate better. also, of course … “eye-ohs” is what i and my colleagues use.

however … the above examples might be construed as being mnemoics as well. <sigh>

ref:

https://www.allacronyms.com/_science/FLOPSY

Eye Ohss
Maybe incorrect, but it sounds mythological, much like the iphone i do not have

I mean no one ran around calling DOS
DEE OH ESS

albino_manatee, that may all be true, but actual usage counts, and in actual usage, “iOS” specifically is always pronounced “I-O-S,” despite what a computer-generated voice on YouTube with a whole 44 views says; walk around saying “eye-ohs” to people who are not your colleagues and see how many recognize what you’re talking about.

.

Yeah, color me surprised that there was even a debate (and I don’t actually see evidence of a pervasive one above). It’s just I-O-S.

No, but they did call OS9 “Oh Ess Nine”.

Having spent many years working at a company that developed management systems that would run on Macs and apps that ran on iPads and iPhones, I can say I never heard eye-yoss or oh-ess-exx from any Apple employee we interacted with or from any of my colleagues.

I-O-S and O-S-Ten

And OS/2 was “Oh Ess Two” and “BeOS” I’ve generally heard as “Bee Oh Ess.” (Though Be-ohs I’ve heard, too.) Then again, BIOS I’ve always heard as an acronym (a single word.)

Saying O-S-10 seems silly to me, for the simple reason that it will often be followed by a full version number, which starts with 10.

It would be good for them if they called it OS-ex so that, if they ever go up to 11, it’ll still work.

No, OS11 would then be Oh-Ess-Ecks-Eye which is awful.

It would be short-lived operating system invented by IBM to challenge DOS.

I meant it would be O S ex 11. Because people know the OS as OS X, not the tenth version of a generic operating system.

If they still called it MacOS X, then I could see sticking with Roman numerals. But, currently, the OS is named OS X.

No, it is not. It is macOS.

You are correct. As of 2016 they have rebranded from OS X to “macOS” (to be consistent with iOS). The version is still 10, however (currently 10.12.2 as I write this).