Wearable startup Whoop just announced its new Whoop 5.0 fitness tracker yesterday, but some existing users are already calling foul. From a report: 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 in that it runs entirely on a subscription membership model. Most wearable makers that have subscriptions will charge you for the hardware, and then customers have the option of subscribing to get extra data or features. A good example is the Oura Ring, where you buy the ring and then have the option of paying a monthly $6 subscription. Whoop, however, has until now said that you get the hardware for "free" while paying a heftier annual subscription. Previously, Whoop promised users that whenever new hardware was released, existing members would be able to upgrade free of charge so long as they'd been a member for at least six months.

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