It would be interesting to continue the experiment over more than 100 charge-discharge cycles to see if the loss in capacity with fast charging is linear or changes with the number of cycles accumulated.
Here is information on the Ampere application for Android shown in the video. There is an app with the same name available for iOS, but it appears to be from another company and looks completely different.
It is particularly enlightening to see how much the battery discharge rate varies with the automatic screen brightness adjustment due to ambient light conditions. The app shows advertisements in a banner at the bottom of the screen. You can get rid of this by purchasing “PRO” mode, which cost me CHF 1.10. This enables additional features such as notifications for various events, running in the background, etc.