Hello @Kleighvictree and welcome to the Community. I apologize if I am misreading what you wrote. The Charge 5 is a tracker and Fitbit makes all the apps and they are limited. I don't wear a Charge 5, but I believe all available apps are preloaded on to the device. If you are referring to the Gallery, these apps are for the smartwatches.
Laurie | Maryland
Sense 2, Luxe, Aria 2 | iOS | Mac OS
Take a look at the Fitbit help site for further assistance and information.
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