Single item comparison
Search one product and instantly see retailer prices, stock signals, pack sizes, unit prices, loyalty prices, and best-deal highlights.
Smarter Shopping. Better Savings
Karto
From one item to a full basket, compare prices, optimise single or multi-retailer purchases, and uncover huge potential savings.
TescoSainsbury'sAsdaAldiLidlMorrisonsWaitroseOcadoM&S FoodIcelandAmazon GroceriesBootsSuperdrugB&MHome BargainsSaversPoundland
Scan BarcodesUse your mobile camera to scan products as they run out and build your next list in seconds.
Local storesChoose your local retailers, preferred stores, and shopping method.
AI OptimisationFrom one retailer to many, optimise your shop to maximise savings.
Picking listFollow a simple in-store list, tick items off as you shop, or download a PDF to take with you.
Product Intelligence
A price checker that understands products.
Search, filter by brand or size, scan a barcode using your camera, and see what is cheapest locally. Karto highlights the best deal by true unit value, not just the lowest shelf price.
Live current pricing across all retailers, including loyalty prices where available.
Local stock checks for many retailers and shopping methods.
Create shopping lists from your searches, compare options and substitute items where no stock exists.
Search: dishwasher tablets
Cheapest shelf priceBest unit value
Retailer & productPriceUnit priceResult
Sainsbury's Fairy Original All in One 22 packNectar price checked · in stock locally
£5.00£0.23 / tabletCheapestTesco Fairy Platinum Plus Lemon 45 packClubcard price checked · local stock signal
£7.00£0.16 / tabletGood valueAsda All in One Dishwasher Tablets 60 packBest value by unit price
£6.50£0.11 / tabletBest valueCompare pageMany products, one clear winner
dishwasher tabletsCompare
BrandRetailerSizeIn stock only
ProductRetailerPriceUnit
CheapestFairy Original All in One 22 packNectar price · stock checked
Sainsbury's£5.00£0.23 eachBest dealAll in One Dishwasher Tablets 60 packBest true unit value
Asda£6.50£0.11 eachFairy Platinum Plus Lemon 45 packClubcard price · local store checked
Tesco£7.00£0.16 eachEssential Dishwasher Tablets 30 packOffer available · online checked
Waitrose£4.95£0.17 eachPicking listReady for the shop floor
ProductQtyPricePick
British chicken breast fillets 640gAisle ready where supported
Mutti chopped tomatoes 400gNectar price applied
Fresh bakery doughnutsDiscount possible, check shelf
Bananas packPack size matched
Basket handoffSend the chosen shop onwards
Chosen basket33
Ready to send£44.44
Karto shopping list
1Chicken breastQty 3 matched
2Tomatoes 400gQty 4 matched
3Bananas packBest substitute selected
Retailer baskets
Tescohandoff
Sainsbury'shandoff
Asdahandoff
Ocadohandoff
Karto prepares the matched basket, substitutions, quantities and loyalty-aware choices before handing off to supported retailer baskets.
Shopping list handoffBuild it once. Send it onwards.
Karto prepares quantities, substitutions, optimisations and when ready is able to populate your chosen retailer baskets with your fully optimised shopping list.
Karto shopping list
1Chicken breast filletsQty 3 · £4.42 each · pack size matched£13.26
2CheapestTomato ketchup 310gQty 1 · sensible swap selected£1.75
3Best valueDishwasher tabletsQty 1 · £0.11 / tablet · best unit value£6.50
4Bananas packQty 1 · £0.11 each · quantity converted correctly£0.89
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Smart basket transfer
Turns your optimised list into retailer-ready basket actions, saving time on manual matching while keeping the money-saving swaps, quantities and loyalty choices intact.
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Supported retailer baskets
Tescohandoff
Sainsbury'shandoff
Asdahandoff
Ocadohandoff
Waitroseplanned
Morrisonsplanned
Karto list
1Chicken breastQty 3 · pack matched£13.26
2CheapestKetchup 310gQty 1 · swap selected£1.75
3Best valueBananas£0.11 each · pack checked£0.89
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Smart basket transfer
Saves time by preparing your money-saving basket for the chosen retailer.
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Choose retailer
Tescosend
Asdasend
Ocadosend
Sainsbury'ssend
Live comparison
Search one product or compare the whole shop.
Karto is built around live retailer data, not stale prices cached for days. Compare prices, loyalty deals, stock, pack sizes, local stores, and sensible substitutes before spending.
Barcode scanning
Use a mobile camera to scan products into a list, detect the product, and find the closest match at your chosen retailer.
Shopping lists that stay live
Build multiple lists, keep them priced, compare them across retailers, and spot saving opportunities as product data changes.
Local stock checks
Use your address, preferred stores, and shopping method so availability is checked against the right local context.
AI-backed deal learning
Karto learns product patterns, brand preferences, pack differences, and substitutions to surface more sensible savings.
Import previous orders
Pull in past online supermarket orders and rebuild them as Karto shopping lists ready for comparison, substitutions and optimisation.
Basket optimisation
End to end cost analysis.
Karto compares your preferred retailer, cheaper single-retailer baskets, and multi-retailer splits. It also factors in fuel, distance, journeys, stock, substitutions, loyalty prices, and timing windows for possible in-store reductions.
Single-retailer optimisation for people who want one shop.
Multi-retailer optimisation and time-based shopping windows to cash in on daily discount windows within your chosen retailers.
AI-backed matching learns product habits, brands, pack sizes, and sensible swaps.
Shopping optimisationComplete basket
Original Retailer£70.77Sainsbury's · 33 of 33 priced
Retailer Optimised£61.42Best single retailer · £9.35 savings available
Fully Optimised Retailers£56.182 retailers · £14.59 savings available
Sainsbury's
Preferred shop£70.77Asda + Aldi
2 retailer split£61.42Fuel and journey
True trip cost included+£2.14Discount timing
Best shelf-check windows flagged-£7.38Fully optimised total
After retailer split, fuel, and timing estimate£56.18Workflow
From empty cupboard to action-ready list.
Karto is designed around real family shopping: scan items using your mobile phone camera as they run out, build reusable shopping lists, compare them locally, then act on the cheapest route.
1
Add items fast
Search, scan barcodes, browse retailer categories, or reuse an imported order.
2
Choose how you shop
Delivery, collection, or going to store changes which retailers and stock checks matter.
3
Let Karto find the money
See like-for-like savings, better-value pack sizes, promotions, and smart substitutions.
4
Optimise, pick, or purchase
Create a mobile picking list, download a PDF, or use supported basket handoff flows.
Aldi · Best time 8am-10am
Chicken breast filletsQty 2 · Pack 1kg · £8.50
✓
Bakery doughnutsQty 1 · £1.39DISCOUNT POSSIBLE
✓
Tomato ketchupQty 1 · £1.85
✓Once you choose
Savings are only useful if they are easy to act on.
Karto turns the chosen basket into a practical trip plan: quantities, product images, barcodes, pack sizes, prices, picked-state, and prompts to check shelves where timing discounts might apply.
Mobile picking list with product images, pack sizes, quantities, and tick-off state.
PDF picking list for paper shoppers, including barcodes and discount-check prompts.
Supported basket handoff for online purchasing where retailer flows allow it.
Pricing
Built to cost less than one small supermarket mistake.
The plan is simple: £2.99 monthly, or £29.99 yearly. For regular family shoppers, Karto only needs to find a small saving each month to more than cover the cost.
Savings-first recommendations: many comparison sites earn referral fees when you buy through a retailer, which can influence what gets promoted. Karto is built to prioritise customer savings first.
Live comparison, shopping lists, barcode scanning, and local store context.
AI-backed learning for substitutions, pack-size value, and shopping habits.
Optimisation with fuel, distance, retailer count, and timing opportunities.