Which to use
“auf” is a preposition and “auto” is a noun - they look or sound alike but fill different roles in a sentence.
- #25,894
- “auf” frequency rank
- #1,803
- “auto” frequency rank
- 27697
- confusion score
Side-by-Side Comparison
| Feature | auf | auto |
|---|---|---|
| Definition | Sur, avec notion d'immobilité. | Automobile. |
Where the eye mixes auf and auto
Muted = shared; highlighted = the visual trap. They share 2 letters in sequence.
Look-alike desk: auf vs auto
These two trip readers on the page rather than in the ear: auf is \aʊ̯f\ while auto is \o.to\. 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 (preposition vs noun), which is usually the fastest check. Our composite confusion score for this pair is 27697, derived from the frequency rank of both members and their visual similarity.
auf is recorded at frequency rank #25,894, classified as aprep, pronounced \aʊ̯f\. auto is at rank #1,803, tagged as anoun, pronounced \o.to\.
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 27697, this pair ranks #327,366 of 440,172 scored French confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of auf vs auto
Shared letters: au. Private to "auf": f. Private to "auto": ot.
"auf" · 3 letters · shape VVC · "auto" · 4 letters · shape VVCV
Known mistypes of this pair
- auto ← atuo · auot · autto · uato
Frequently Asked Questions
Is swapping "auf" for "auto" ever safe?
In ordinary French text, does "auf" or "auto" show up more?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "auf" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "auto" - compare definitions side by side with the headword page. Word entry
- This pair ranks #327,366 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "auf" and "auto" also get mixed up with nearby pairs, the highest-scored neighbour is "auf vs aur". 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 #327,366 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.