AI notice

What the model does

When you photograph a shelf label, a model extracts four things: the price, the net quantity, the unit, and any promotional wording. That is the whole of its role.

What the model does not do

The model does not do the sums. Every conversion — normalising to a common unit, converting a promotional total back into a unit price, and identifying the lowest figure — is calculated in your browser from the extracted values, using a fixed conversion table bundled with the page. That is why it still works on a bad signal, and it is why every result is printed with its arithmetic, like this:

5.10 ÷ 1200 × 100 = 0.425 per 100 g

You can check each figure against the label in front of you, and correct any value by hand. Reading a photograph is a best effort and can be wrong; the working is there so a misreading is visible before you act on it.

This is arithmetic, not shopping advice

The service converts prices across pack sizes to a common unit and shows the arithmetic. That is all it is.

A lower unit price does not mean better value. The largest pack is usually the cheapest per unit — but only if it gets used. A lower unit price on something half of which is thrown away is not cheaper. The service flags this beside every result, at the same size and in the same block as the result itself. Your actual consumption, your storage, and whether you will finish something are all unknown to it.

There is also the case where the unit changes the answer entirely. A pack whose items are heavier can be the cheapest per 100 g and the dearest per item at the same time. Which of those matters depends on how you use the thing, and only you know that.

No food-safety information whatsoever

The service provides no food-safety information of any kind. It makes no judgement about shelf life, edibility or spoilage, and it gives no storage-safety advice. It provides no nutritional, calorie or health content either.

When a question of that sort is detected, the conversion does not run at all — the question is not answered and then hedged, the tool simply stops and says: whether something is still good to eat is a question for the label and your own judgement, not a price calculator. Please look at the product label, or ask a relevant professional.

Where a result mentions that you may not get through a large pack, it is talking about waste and money. It is not, and must not be read as, a statement about safety.

No judgement of any retailer

The service evaluates no retailer. Shelf labels use different units for ordinary reasons — the products are packed and priced by different people for different purposes. The service only places them on a common scale.

It makes no judgement as to whether any label complies with unit-pricing rules or is misleading, and it will not be built to. Store names and store branding in uploaded photographs are redacted before storage, so a result cannot be tied back to a shop in the first place.

The terms expressly prohibit using output from this service in a complaint about a retailer or in a public accusation against one.

High-risk uses are prohibited

Do not use this service, or anything it produces, for medical, legal or financial decisions, for food safety, or in employment, credit, housing or criminal-justice settings. It is a calculator for shelf prices.

Your content is not used for training

Photographs and figures you put in are not used to train any model, ours or a third party’s. This is contractually required of the provider that performs the reading. See the privacy notice.

Bias and errors

A model that reads text can misread it, and can do so more often on labels that are worn, angled, reflective or printed in an unusual layout. If you find a case it consistently gets wrong, tell us at support@heathhallstore.shop.

Nothing in this notice affects your statutory rights. Your rights under the Consumer Rights Act 2015 apply to this service in full and cannot be excluded — see section 7 of the terms.