Mostly reliable, but notification spam – Slice - Package Tracker Review

Slice is a poorly designed app, but it's mostly reliable and has the added benefit of retrieving tracking info from your email automatically. The price reduction alert doesn't work, however, and it recently started spamming notifications with ads. Since notifications are the point of the app you can't just turn them off... the only choice is to uninstall.
Review by Qohelet on Slice - Package Tracker.