Which to use
“iOS” and “ISS” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #5,888
- “iOS” frequency rank
- #16,055
- “ISS” frequency rank
- 21943
- confusion score
Side-by-Side Comparison
| Feature | iOS | ISS |
|---|---|---|
| Definition | A mobile operating system (OS) created and developed by Apple Inc. exclusively for its hardware. | Initialism of International Space Station. |
Letter map: iOS vs ISS
Shared letters muted; letters that set iOS and ISS apart highlighted. Shared run: 2.
Spelling & dictionary notes on iOS vs ISS
iOS and ISS are indexed as a confusable English pair. We have no recorded pronunciation or part of speech for both members, so the spelling overlap is what we can show you: they differ by a single letter - o in “iOS” becomes s in “ISS”. Our composite confusion score for this pair is 21943, derived from the frequency rank of both members and their visual similarity.
iOS is recorded at frequency rank #5,888, classified as aname. ISS is at rank #16,055, tagged as aname.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 21943, this pair ranks #420,223 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of iOS vs ISS
Shared letters: is. Private to "iOS": o. Private to "ISS": -.
"iOS" · 3 letters · shape VVC · "ISS" · 3 letters · shape VCC
Frequently Asked Questions
Is swapping "iOS" for "ISS" ever safe?
In ordinary English text, does "iOS" or "ISS" show up more?
Useful next steps
Pair "iOS" vs "ISS" is on the table, pick a follow-up below.
- Full dictionary entry for "iOS" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "ISS" - compare definitions side by side with the headword page. Word entry
- This pair ranks #420,223 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "iOS" and "ISS" also get mixed up with nearby pairs, the highest-scored neighbour is "ISS vs ith". Nearby pair
Confusion rank #420,223 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.