Fitbit Versa 4 vs. Versa 3: Here's why it might not be worth the upgrade

Fitbit's Versa 4 isn't much of an upgrade over the Versa 3 and is plagued by lousy fitness tracking accuracy and a lack of third-party app support.

https://www.businessinsider.com/guides/tech/fitbit-versa-4-vs-versa-3