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As of 13 August 2026, AI can compare food prices across UK supermarkets.
This still needs a person who signs their name to it.
Can you do it?
5 minutesto a draft.
30 minutesto something you’d act on.
Cost, all in£0
Skill neededchat-fluent
Who has to check ityou
What the alternative costsThe listed purpose-built alternative, Eat This Much, provides automatic meal plans from calories, diet and budget rather than a supermarket price comparison, and no price is supplied.
If this goes wrong: you buy a more expensive or unsuitable item, and can usually correct the choice on your next shop.
What to actually do
Hand it to a person
The route this page recommends
A person who owns the outcome does this end to end, worth it when the failure is dear.
Do it yourself
Second choiceA chat interface, chat-fluent skill, and roughly 30 minutes until you can act on the result.
How to actually do it
- Write the exact basket you need, including quantities, preferred brands, pack sizes and acceptable substitutions.
- Record your delivery area or postcode district and open the current product pages for the supermarkets you want to compare.
- Paste the product names, pack sizes, prices, offer conditions and availability from those pages into a chatbot with the prompt.
- Ask the chatbot to produce a table showing each supermarket's item prices, unit prices, basket total and any missing or non-equivalent products.
- Open the live supermarket pages again and compare every price, pack size, loyalty condition, multibuy rule and availability note against the drafted table.
- Choose the cheapest basket that still meets your specifications, then check delivery charges and send or place the order through the supermarket's own website.
Prompt
Compare the UK supermarket prices in the product information I provide. My basket is: [list each item, quantity, brand or acceptable alternatives]. My delivery area or postcode district is: [area]. Compare these supermarkets: [supermarket names]. Use only the prices and product details I paste or link to, and do not invent missing prices. Match products by size, weight, count, brand and specification before comparing them. Separate standard prices, loyalty prices, multibuy offers, delivery charges and minimum basket conditions. Calculate the basket total for each supermarket and show the price per unit where the pack sizes differ. Mark any item that is unavailable, not equivalent, regional, dependent on a loyalty card or affected by an unclear offer. Put the results in a table, then list the cheapest valid option for each item and the cheapest complete basket. State which figures I need to check on the live supermarket page before buying.
Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.
Use a tool built for this
The distant third
What it gets wrong
- It cannot guarantee that a price is live, local to you or still available when you shop.
- It cannot reliably recognise when two products are different in ingredients, quality, pack format or dietary suitability unless you provide those requirements.
- It cannot access loyalty-card prices, logged-in accounts or postcode-specific stock unless you supply the relevant information.
- It cannot decide whether a cheaper product is suitable for a medical diet; if your question is linked to urgent or worrying symptoms, use NHS 111 rather than relying on a price comparison.
Even on a YES, the friction has a name: real time truth, verification cost and context depth.
How we scored this
Five axes, each scored nought to two by hand: ten means AI carries the task cleanly, and the thresholds that turn a total into YES, PARTLY or NO are published in the methodology. Each axis name links to its definition.
| Axis | Score (0–2) |
|---|---|
| Output | 2 |
| Inputs | 2 |
| Verification | 1 |
| Liability | 2 |
| Effort delta | 1 |
| Total | 8 / 10 |
The methodology and its thresholds are published in full.
FAQ
- Can AI compare supermarket prices in the UK?
- Yes. Give it a fixed basket and current product pages or prices from the supermarkets you want to compare, and it can standardise pack sizes, calculate totals and flag differences. Check the result against the live pages because prices, offers, loyalty conditions and stock change.
- Can ChatGPT compare Tesco, Asda, Sainsbury's and Aldi prices?
- It can compare information you provide from those supermarkets and present the result in one table. It cannot guarantee a complete or current comparison if a page is regional, behind a login, affected by a loyalty scheme or missing from the supplied data.
- How do I get AI to find the cheapest weekly shop?
- Give it your full shopping list, quantities, acceptable substitutions, delivery area and current product links from each supermarket. Ask it to compare unit prices and complete-basket totals, then verify every figure and offer condition on the supermarket websites before ordering.
- Can AI compare food prices for a special diet?
- It can filter a comparison using requirements you state, such as a named ingredient to avoid, but you must check the product labels and allergy information yourself. AI is not a diagnosis or dietary prescription service, and urgent or worrying symptoms should go to NHS 111.
Nearby answers
Assessed by gpt-5.6-luna (gpt-5.6-luna) on 2026-08-13, second-checked by an independent model. Wrong somewhere? Email [email protected] and it gets re-checked.
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