An app (and website) that I discovered recently when tracking something from AliExpress has proved extremely useful for, well, everything.
17Track (https://www.17track.net/en) takes tracking numbers from hundreds of different courier companies, including Royal Mail, Evri, Yodel, DPD, DHL, etc and provides the tracking information for them. It does autodetection of the carrier from the tracking number format, which is almost always successful.
It means you can have all your incoming items tracked in one place rather than going from app to app. As I sometimes have half a dozen things coming, it's very handy.