One in five smartphone owners now do some of their shopping through apps, according to new research.
App shoppers spend an average of £30 a month on items from groceries and DVDs to train and cinema tickets, the study for marketing firm The BIO Agency found.
The company estimates that £581 million per year is now being spent through apps by UK consumers who said convenience was the main attraction.
The BIO Agency's managing director Peter Veash said: "It's about convenience and simplicity when purchasing. You might not be at the shop or have access to a computer but you do have your phone with you.
"You can also compare prices easily. You can be in shop A and instantly check the price in shop B."
3,000 people were surveyed by online research company OnePoll in March.