>needs an app
Now imagine the same product but with different physical toggles or buttons on it for all the different charging modes. No apps. That'd be great.
Or even a way to communicate this to the charger from the phone using the vendor extension to PD protocol negotiations…
Switching between 500 mA, 2.1A, and USB-PD or QC is technically simple, but again you're making consumer electronics for a very, very small group of people.
How would it determine when the attached device reaches 80% state of charge? Or what the time of day is? How could you program a schedule for weekdays and weekends?
There are good reasons for Chargie to have an app, it's not just there to siphon up analytics.