WeWard

The best known of the apps that pay you a little to walk. WeWard counts steps with your phone and turns them into rewards that can be cashed out through PayPal or Venmo, swapped for gifts and deals from partner brands or given to charity, and the company puts its users in the tens of millions. Set expectations low: rewards build slowly, and WeWard does not publish its exchange rates or minimum cash-out plainly, so check them in the app before counting on a payout. It is free on iPhone and Android, with an optional Premium subscription, and works best as a small bonus on walks you were taking anyway, not as the app for a group challenge.