The shortlist
4 things that do it.
UK grocery price comparison site with deals, price comparisons across stores and shopping lists.
- Free
- Free to use per its pages; its About page says it is powered by sponsors and will always be free (that page may be dated).
- Paid
- price not checked
- Best at
- Comparing prices across many shops: its home page lists Asda, Sainsbury's, Morrisons, Co-op, Iceland, Tesco and Waitrose, plus Boots, Superdrug, Amazon and eBay.
- The catch
- Its home page does not explain how prices are collected or how often they update, so check the shop's own price before buying.
- web
- mobile app
Tracks prices across 13 UK retailers, with shopping lists, price alerts and price history.
- Free
- Free on web, app and Chrome extension, with no premium tier mentioned on the page.
- Paid
- price not checked
- Best at
- Price history and alerts: it says you can check price history to spot genuine discounts and set alerts for brands or keywords.
- The catch
- It is ad and commission funded, so a small number of ads may appear in the app and on the website, and it earns commission from retailer clicks.
- web
- ios
- android
- chrome
Basket comparison: enter a shopping list and it matches items across supermarkets, shows totals and suggests cheaper alternatives.
- Free
- No pricing shown on the page, so it appears free; the vendor does not say so explicitly.
- Paid
- price not checked
- Best at
- Comparing a whole basket including loyalty prices across Tesco, Sainsbury's, Aldi, Asda and Morrisons.
- The catch
- It says prices may vary from live store pricing and availability, its price data showed collection dates of 2 August to 11 September 2026, and it does not say who operates it.
- web
A monthly Which? comparison of what a basket costs at each supermarket, using prices tracked daily.
- Free
- The page showed no paywall or membership requirement when we read it.
- Paid
- price not checked
- Best at
- Showing which supermarket was cheapest for the month: Aldi in August 2026 at £159.36 for 92 items, with Lidl at £161.10.
- The catch
- It is a monthly article, not a tool for your own basket. Which? says the products vary month to month, so totals are not comparable between months or years, and it cannot include points or personalised discounts.
- web
The same shortlist, as a table
| Thing | Free tier | Paid from | Platforms | The catch |
|---|---|---|---|---|
| Trolleyrel="nofollow noopener" | Free to use per its pages; its About page says it is powered by sponsors and will always be free (that page may be dated). | not checked | web, mobile app | Its home page does not explain how prices are collected or how often they update, so check the shop's own price before buying. |
| MyGroceryPalrel="nofollow noopener" | Free on web, app and Chrome extension, with no premium tier mentioned on the page. | not checked | web, ios, android, chrome | It is ad and commission funded, so a small number of ads may appear in the app and on the website, and it earns commission from retailer clicks. |
| CompareTheTrolleyrel="nofollow noopener" | No pricing shown on the page, so it appears free; the vendor does not say so explicitly. | not checked | web | It says prices may vary from live store pricing and availability, its price data showed collection dates of 2 August to 11 September 2026, and it does not say who operates it. |
| Which? cheapest supermarket trackerrel="nofollow noopener" | The page showed no paywall or membership requirement when we read it. | not checked | web | It is a monthly article, not a tool for your own basket. Which? says the products vary month to month, so totals are not comparable between months or years, and it cannot include points or personalised discounts. |
How we checked
What we read, and what we haven't tested yet.
On 2026-10-02 we read the home pages of Trolley, MyGroceryPal and CompareTheTrolley, Trolley's About page (which may be dated), Which?'s supermarket price comparison article, and gov.uk's government response on unit pricing. Allsupers refused our fetch, so it isn't listed. We read no app store listings and tested nothing hands-on.
If none of these fit
The manual way.
For comparing in store, look at the unit price on the shelf label. The government said on 24 January 2024 that it would mandate consistent use of unit pricing measures, while keeping the exemption for small shops. Otherwise check each supermarket's own site, including loyalty prices such as Nectar and Clubcard, which Which? shows separately. Nothing we read covers the US.