In 2026, for the vast majority of adult travelers in London, using a contactless bank card or mobile payment (Apple/Google Pay) is just as cheap as using a standard Oyster card, as both benefit from the same daily and weekly fare capping. The primary advantage of the Oyster card today is for specific demographics: children aged 11–15 can have a "Young Visitor Discount" added to an Oyster to pay half-price, which is impossible on a bank card. However, for international tourists, using an overseas bank card can sometimes incur small foreign transaction fees per swipe, making a prepaid Visitor Oyster Card a better way to stick to a fixed budget. If you are an adult with a UK bank card or a fee-free international travel card, there is no financial reason to pay the £7 non-refundable fee for a new Oyster card, as "tapping in" with your phone provides the exact same "best fare" guarantee across the Tube, bus, and rail networks.