The most convenient option is to use lightweight trackers that compare subscriber lists over time. They don't overload you with features and provide just the basic list you need.
You can also combine this with manual checking, saving your subscriber list every few days and monitoring changes. This is surprisingly convenient if you don't want to depend on apps.
You can also combine this with manual checking, saving your subscriber list every few days and monitoring changes. This is surprisingly convenient if you don't want to depend on apps.