The supermarket said its IT teams were working to fix the issue, which began just before 10am on Tuesday.
According to service status website Downdetector, hundreds of Tesco customers began reporting problems with both the firm’s website and app at about 9.45am, and more than 500 reports were logged with the site.
Customers used social media to report being unable to complete their online shopping via the app or website.
Tesco posted on X: “We are aware of issues with our app and website, I’m sorry for any inconvenience this has caused.
“Our I.T teams are working hard to have this fixed as soon as possible, please keep checking back periodically and hopefully they will be working shortly.”
The supermarket has not said what has caused the issue, or if it is affecting deliveries.
In February the firm was hit by an online shopping glitch which caused items to be removed from customer baskets, or marked as unavailable, as they tried to complete an online shop.
Tesco said it had been caused by a “technical issue” with some customer baskets.
Tesco recall issued
Tesco has recalled some of its products from supermarket shelves across the UK because they may pose a health risk to customers.
The supermarket giant has recalled various Tesco Free From Meal Kits because they contain undeclared soya.
The presence of soya, not mentioned on the label, makes them a potential health risk for anyone with an allergy to soya.
The affected products are the Tesco Free From Katsu Curry Meal Kit, affecting all products with a best before date up to and including December 12; and the Tesco Free From Sweet & Sour Meal Kit with a best before date up to and including May 19.
A spokesman for the Food Standards Agency (FSA) said: “Tesco is recalling the above products from customers and has been advised to contact the relevant allergy support organisations, which will tell their members about the recall.
“The company has also issued a recall notice to its customers.
“These notices explain to customers why the product is being recalled and tell them what to do if they have bought the product.
“If you have bought the above products do not eat them. Instead, return them to any Tesco store for a full refund. For more information contact Tesco Customer Services on 0800 505 555.”
