Based on data shared with the Guardian by mobile data startup Onavo, 4.3% of UK iPhone owners use at least one sports betting app.
William Hill takes the lead with 38% of those iPhone sports gamblers. However, according to data analysis of usage of Onavo Count and Extend apps, it was revealed that bet365 is the most popular betting app in the UK.
Guy Rosen, Chief executive of Onavo, stated that: "There's a lot of overlap: people are using a lot of apps rather than just one". For example, 17% of the bet365 users also use Betfred and another 10% use Paddy Power.