API vs at, What's the Difference?

Which to use

“API” is a noun and “at” is a preposition - they look or sound alike but fill different roles in a sentence.

#11,501
“API” frequency rank: #21
“at” frequency rank: 11522
confusion score

Side-by-Side Comparison

Feature	API	at
Definition	Initialism of active pharmaceutical ingredient.	In, near, or in the general vicinity of (a particular place).

Where the eye mixes API and at

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence.

3 ch

API

2 ch

Look-alike desk: API vs at

These two trip readers on the page rather than in the ear: API is /ˌeɪˌpiˈaɪ/ while at is /æt/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (noun vs preposition), which is usually the fastest check. Our composite confusion score for this pair is 11522, 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/. at is at rank #21, tagged as aprep, pronounced /æt/.

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 11522, this pair ranks #486,566 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.

Orthographic DNA of API vs at

Shared letters: a. Private to "API": ip. Private to "at": t.

"API" · 3 letters · shape VCV · "at" · 2 letters · shape VC

Frequently Asked Questions

Do "API" and "at" mean the same thing in a sentence?

No - they are not even the same part of speech. "API" is a noun and "at" a preposition, so a sentence built for one is usually ungrammatical with the other.

Which is more common, "API" or "at"?

"at" is the more common of the two: it sits at frequency rank #21 in our English list, against #11,501 for "API". That is a wide gap, so in ordinary text the rarer spelling is the one worth double-checking.

Useful next steps

Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.

Full dictionary entry for "API" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "at" - compare definitions side by side with the headword page. Word entry
This pair ranks #486,566 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
"API" and "at" also get mixed up with nearby pairs, the highest-scored neighbour is "amb vs API". Nearby pair

Confusion rank #486,566 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.