sei vs sto, What's the Difference?

Which to use

“sei” and “sto” are a confusable Spanish pair: similar on the page, but distinct in meaning, check the gloss before you choose.

#48,072
“sei” frequency rank: #36,304
“sto” frequency rank: 84376
confusion score

Side-by-Side Comparison

Feature	sei	sto
Definition	Seis.	Ciento.

Where the eye mixes sei and sto

Muted = shared; highlighted = the visual trap. They share 1 letter in sequence. sei (CVV) and sto (CCV) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.

3 ch

sei

3 ch

sto

Look-alike desk: sei vs sto

A purely visual mix-up. sei (/s̺ej/) and sto ([ˈsto]) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they share most of their letters but differ in 2 positions. Our composite confusion score for this pair is 84376, derived from the frequency rank of both members and their visual similarity.

sei is recorded at frequency rank #48,072, classified as anum, pronounced /s̺ej/. sto is at rank #36,304, tagged as anum, pronounced [ˈsto].

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 84376, this pair ranks #7,113 of 323,831 scored Spanish confusable pairs - among the most confusable pairs.

Orthographic DNA of sei vs sto

Shared letters: s. Private to "sei": ei. Private to "sto": ot.

"sei" · 3 letters · shape CVV · "sto" · 3 letters · shape CCV

Frequently Asked Questions

Do "sei" and "sto" mean the same thing in a sentence?

No. They are said differently (/s̺ej/ versus [ˈsto]) and carry different meanings; reading the sentence aloud is usually enough to catch the wrong one.

In ordinary Spanish text, does "sei" or "sto" show up more?

"sto" is the more common of the two: it sits at frequency rank #36,304 in our Spanish list, against #48,072 for "sei". The two are close in frequency, so neither is a safe default; check the meaning rather than guessing.

Useful next steps

Eye-level mix-up between "sei" and "sto" is sorted above. Next: full entries or other pairs that share a letter shape.

Full dictionary entry for "sei" with definition, IPA, and generated misspellings. Word entry
Full dictionary entry for "sto" - compare definitions side by side with the headword page. Word entry
This pair ranks #7,113 of 323,831 scored Spanish confusable pairs in this corpus vintage. Corpus statistics
"sei" and "sto" also get mixed up with nearby pairs, the highest-scored neighbour is "sei vs stem". Nearby pair

Confusion rank #7,113 of 323,831 scored Spanish pairs, corpus vintage 2026-09-03, not spelling advice.