The Fitbit Sense 2 and Versa 4 now support a single third-party app
PSA for anyone with a Fitbit Versa 2- there is currently a FREE watch face download in the Fitbit app that turns your Fitbit into a Pip-Boy 🤓 : r/GirlGamers
Fitbit - Apps on Google Play
FitBit : How To Install New Apps (Versa | Versa2 | Charge 4 | Ionic) - YouTube
How to download apps for your Fitbit - The Verge
Fitbit Versa Apps - Top 10 Best FREE Apps (2020) [Part 2] | Smartwatch Cool Things You Need To Know! - YouTube