Yappman Data Supermarket Price Snapshots

Returns the licence (CC BY 4.0) and credit form, what is not served, the store setting, the published index weeks and the basket date range with its short and missing days. The licence covers our compilation only, not retailer content. Call it before citing or relying on the other tools.

Returns one week of the UK Christmas dinner basket summary (weekly to 24 Dec 2026): posted shelf prices of numbered items at Tesco, Sainsbury's, Asda and Aldi with flags, or totals over the items each retailer priced. Item numbers only, no product names. Not a CPI and not a price comparison: retailers in a fixed order, never by price; totals cover different items. Weekly snapshots, not live; the open week changes until Sunday. Omit week for the latest. Quote the notes with any total.

Returns one published week of the UK or Australian online shelf-price index: index levels, week-on-week change and matched-product counts by retailer and product class. It measures posted online shelf prices, not prices paid; not a CPI or a government statistic. Index levels are not price levels and do not show which retailer is cheaper. No product names. matched and matchedShare show how many products each row rests on. Omit vintage for the latest week; list_index_vintages gives the others.

Returns the identifiers of the products in the UK daily 212-item basket for one day, sorted, with paging: retailer, retailer product id and barcodes (`ean`, empty where the basket holds none, as for Aldi). No names, brands or prices. Use it to find what lookup_basket_prices can look up.

Lists the published weeks (vintages) of the UK or Australian online shelf-price index, newest first, with publication time, revision and base week. Returns no index values and no prices. Use it to choose a week for get_shelf_price_index.

Returns shelf-price snapshot values from the UK daily 212-item basket for up to 20 barcodes (EAN) or retailer product ids, one day, up to one row per retailer: price, was-price, loyalty price, unit price, pack size and stock, as posted. Loyalty prices appear in the basket rows only, not in the index values. Static snapshot days, not live, not a price comparison, not a statement of which retailer is cheaper. No name search. Aldi has no barcodes: use product ids. Wider data: see about_the_data.