Whoop angers users over reneged free upgrade promises

Upgrading from the Whoop 4.0 to the 5.0 hardware is no longer free for most existing customers.

Whoop just announced its new Whoop 5.0 fitness tracker yesterday, but some existing users are already calling foul. Previously, Whoop said people who had been members for at least six months would get free upgrades to next-generation hardware. Now, the company says that members hoping to upgrade from a Whoop 4.0 to 5.0 will have to pay up.

Whoop is a bit different from other fitness trackers...