Comparison
Cider vs cider vinegar
Is cider vinegar just cider that has gone off?
In short
Cider vinegar is made from cider, but by a distinct second stage. Acetic acid bacteria, chiefly Acetobacter species, oxidise the ethanol to acetic acid. That reaction needs oxygen, and it needs it in quantity.
This is why the two are not the same process running at different speeds. A sealed, topped-up, sulphited cider has very little dissolved oxygen and stays cider; a vinegar producer deliberately maximises air contact, holds the liquid warm, and inoculates. Uncontrolled acetification in a cider is a fault, but it is a fault caused by the same organisms doing the same chemistry in the wrong place.
The finished products are not interchangeable. Vinegar has effectively no ethanol left and an acetic acid concentration far above anything drinkable.
The two things being compared
Each side described in its own terms first, so the table below has something to hang on.
Cider
The product of yeast fermenting apple sugar to ethanol, kept away from oxygen thereafter.
Cider vinegar
The product of acetic acid bacteria oxidising the ethanol in cider to acetic acid, under deliberately aerobic conditions.
Where they differ
Dimension by dimension. Where a row needs a qualification, it carries one rather than being simplified until it fits.
| Dimension | Cider | Cider vinegar |
|---|---|---|
| Organism | Yeast, principally Saccharomyces cerevisiae, working anaerobically. | Acetic acid bacteria — Acetobacter and Gluconobacter species — working aerobically. |
| OxygenOxygen availability, more than anything else, is what decides which product you get. | Excluded as far as possible after fermentation. Topping up and sealed vessels are standard. | Supplied in quantity, by surface culture or by forced aeration. |
| Chemistry | Sugar to ethanol and carbon dioxide. | Ethanol to acetaldehyde, then to acetic acid. |
| Ethanol at the end | The point of the process. | Substantially consumed; a finished vinegar retains very little. |
| Acidity | Malic and lactic acid, at a level compatible with drinking. | Acetic acid at a concentration far beyond palatability as a drink. |
| Status of the changeThe chemistry is identical; only the intent, the control and the endpoint differ. | Acetification in a cider is recorded as a fault: volatile acidity. | The same reaction, intended, controlled and taken to completion. |
| Timescale | Primary fermentation runs from days to months. | Surface acetification is slow — months — while submerged aerated processes are far faster. |
Notes under a dimension name qualify the whole row, not one column.
When Cider is the relevant one
The circumstances in which this is the thing being described, rather than a reason to prefer it.
- The subject is a drink, and oxygen is being excluded.
- You are diagnosing a rising volatile acidity that was not intended.
When Cider vinegar is the relevant one
The circumstances in which this is the thing being described, rather than a reason to prefer it.
- The subject is a food ingredient made deliberately from cider.
- You are explaining why a broached cask or a half-full container sours.
A misconception worth clearing up
This comparison exists partly because of the claim below, which is repeated often enough that most readers arrive holding it.
Cider vinegar is simply what cider becomes if you leave it long enough.
What is actually the case: Only if you also leave it open to air. Time alone does nothing; the bacteria need oxygen at every step, which is why a properly sealed and topped-up cider can age for years without souring. Vinegar production works by supplying exactly the condition cider-making works to withhold.
Related comparisons
Distinctions that turn on the same thing, or that this one is routinely confused with.
Cider vs apple juice
The same liquid at two stages: apple juice is what comes off the press, and cider is what that juice becomes once yeast has fermented its sugar to alcohol.
Volatile acidity vs ethyl acetate
Volatile acidity is acetic acid, which tastes and smells of vinegar; ethyl acetate is its ester with ethanol, which smells of solvent and pear drops. They usually arrive together but they are different compounds with different thresholds.
Fault vs style feature
Many of the compounds recorded as faults are present in well-regarded traditional ciders. What separates a fault from a feature is concentration, integration and whether the producer intended and controlled it.
What people ask next
Questions readers ask about the things this page mentions. Each one goes to the section that answers it rather than to a page written to receive the question.
- What is the difference between cider and apple juice — In Britain, cider is fermented and apple juice is not. In the United States the distinction is different again: "cider" there usually means fresh, cloudy, unfiltered juice, while "apple juice" means the filtered, pasteurised kind.
- When is a cider faulty and when is it just traditional — The same compound can be either, and the deciding factor is the tradition the cider belongs to and the concentration. Volatile acidity that would condemn a modern fresh-fruit cider is expected in a traditional Asturian one, and neither judgement is wrong.
- What is the difference between volatile acidity and ethyl acetate in cider
Where to go next
- All comparisons — The rest of the pairs, grouped by what kind of difference is at stake.
- Glossary — Either term on its own, defined without a second thing to hold it against.
- Learn about cider — The background these pages assume, written from the beginning.
Sources
What this page rests on. Where a source is marked as registered rather than read, CiderHQ is recording that the body is authoritative on the subject without claiming to have worked through the document itself. See our evidence policy for what each state means.
Peer-reviewed literature on cider fermentation microbiology
Various journals · peer-reviewed literature · registered as competent for this subject
Covers the microbial succession of spontaneous cider fermentation, the role of non-Saccharomyces yeasts in the early stages, malolactic conversion by Oenococcus and Lactobacillus species, and the organisms behind the principal spoilage faults.
The Science of Cidermaking and associated technical writing
Andrew Lea · reference work · passage verified 2026-08-24
Written by a food chemist who worked at Long Ashton on apple phenolics. Unusual among specialist cider writing in that it is primary-research-adjacent: the author is describing work he did, and cites the literature. This is why it is registered at tier 1 for chemistry while a general cider book is not.
Cider and perry production technical training material
Peter Mitchell / Cider and Perry Academy · reference work · registered as competent for this subject
Searched again on 2026-08-25 and it remains the one printed source here that a bibliographic check cannot fix, because it is not a published work with an edition. It is course material issued to participants of a training programme, so there is no catalogue record to verify, no ISBN, and no lawful public copy. Its state stays `registered` for that reason rather than through inattention.