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UK supermarket protein index

Cheapest protein in Britain, checked daily.

Protein Spy sweeps the big UK supermarkets every morning and ranks meat, fish, dairy, plant protein and powders by what really matters: the cost of 100g of actual protein.

Free to download · No account, no sign-up

What the app does

Protein per pound, not price per pack

A £3 pack of chicken and a £3 tub of yoghurt are not the same shop. Protein Spy does the maths so the comparison is honest.

Ranked by cost per 100g protein

Every product is converted to the same unit, so a chicken thigh, a tub of skyr and a scoop of whey sit in one league table.

Refreshed every morning

Prices are collected daily, so you see the current picture rather than last month's shelf.

Filter to how you eat

Vegan and vegetarian, red meat, white meat, fish, dairy or protein powders — narrow the table to the aisles you actually shop.

High-protein recipes, costed

Each recipe shows the protein per serving and roughly what the ingredients cost at the supermarkets we track.

Save your favourites

Keep the recipes and staples you buy again to hand. Everything stays on your phone.

No account required

Open the app and the table is there. No email, no password, no profile to fill in.

Where the prices come from

The shops we compare

Tesco Sainsbury's Asda Morrisons Waitrose Aldi Lidl

Prices are gathered from publicly listed supermarket data and refreshed daily. They are a guide, not a quote: promotions, loyalty pricing, multibuys and in-store or regional differences may not be reflected. Always check the price at the till or checkout. Protein Spy is an independent app and is not affiliated with, endorsed by or sponsored by any retailer named here.

What it costs

Free for the prices. Premium for the cooking.

The daily price table is the same for everyone — no delayed data, no held-back shops.

Free

£0 / forever

  • The full daily price table
  • All filters and search
  • First 10 recipes, fully costed
  • Saved favourites
  • Supported by a small banner ad

Premium

£2.99 / month

  • Everything in the free version
  • The complete recipe library, costed per supermarket
  • No ads anywhere in the app
  • Cancel any time in the App Store or Google Play

Know the cheapest protein before you leave the house.

Free to download for iPhone and Android.

Download on the App Store Get it on Google Play

Coming soon to both stores