Rivalling your nearest bakery, the best supermarket sourdough loaves still offer that signature tang and airy crumb. From Waitrose premium selection to Sainsbury’s own bloomer, which store-bought sourdough is best? I sliced my way through dozens of loaves to find out.A naturally leavened bread, sourdough rises thanks to the activity of wild yeast rather than added raising agents. You know it’s a good loaf when the bread is soft, springy and the texture inside the bread is crumbly, with air pockets that are evenly spread throughout. Fermentation is key: when the baking process isn’t quite right, it can result in what bakers call ‘tunnelling,’ where overly large, uneven holes form inside the bread.Swie Joo, head baker at The Palmerston, points out that “sourdough isn’t a legally protected term, so technically any bread can currently be called sourdough.” This means that the “rustic” looking loaf in your trolley might just be standard yeasted bread disguised with flavourings to mimic the tang of the real thing.For a loaf to genuinely be considered sourdough, it has to be made with a live starter – a naturally developed blend of wild yeast and bacteria, rather than commercial yeast. It must be given enough time to ferment slowly, too. Joo advises checking the label before you buy. If yeast is listed among the ingredients, it’s not a true sourdough, as a traditional loaf depends entirely on natural fermentation, without any added yeast. Below, you’ll find the very best supermarket sourdough loaves worth buying. Read more: The best supermarket cheddars, taste-tested for tang and creaminessI taste-tested more than 20 sourdough loaves and whittled them down to my favourites (Emma Henderson/The Independent)The best supermarket sourdough bread for 2026 is: Best overall – Wildfarmed white sourdough bread: £4, Waitrose.comBest for toast – Sainsbury's taste the difference white sourdough half bloomer: £2, Sainsburys.co.ukBest for flavour – Waitrose no 1 white sourdough bread: £2.25, Waitrose.comBest gluten-free bread – Good Grain Bakery gluten-free seeded sourdough: £6.20, Ocado.comRead more: We taste-tested the best supermarket olive oils