Which to use
“API” is a noun and “appt” is a verb - they look or sound alike but fill different roles in a sentence.
- #11,501
- “API” frequency rank
- #48,065
- “appt” frequency rank
- 59566
- confusion score
Side-by-Side Comparison
| Feature | API | appt |
|---|---|---|
| Definition | Initialism of active pharmaceutical ingredient. | Abbreviation of appoint. |
Letter map: API vs appt
Shared letters muted; letters that set API and appt apart highlighted. Shared run: 2.
Role in the sentence - API and appt
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: API is anoun and apptaverb. On the page they differ by 1 letter(s) in length. Our composite confusion score for this pair is 59566, derived from the frequency rank of both members and their visual similarity.
API is recorded at frequency rank #11,501, classified as anoun, pronounced /ˌeɪˌpiˈaɪ/. appt is at rank #48,065, tagged as averb.
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 59566, this pair ranks #105,386 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of API vs appt
Shared letters: ap. Private to "API": i. Private to "appt": t.
"API" · 3 letters · shape VCV · "appt" · 4 letters · shape VCCC
Known mistypes of this pair
- appt ← apptt · aptp · papt
Frequently Asked Questions
Is swapping "API" for "appt" ever safe?
Which is more common, "API" or "appt"?
After this comparison
Pair "API" vs "appt" is on the table, pick a follow-up below.
- Full dictionary entry for "API" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "appt" - compare definitions side by side with the headword page. Word entry
- This pair ranks #105,386 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "API" and "appt" also get mixed up with nearby pairs, the highest-scored neighbour is "APL vs appt". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #105,386 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.