A big issue with this trend is that unlike the web, the whole Android ecosystem is a walled garden which is strictly controlled by Google. In principle you can run your own custom Android ROM, but in practice this will lock you out from any app which uses Play Integrity API to enforce Google's totalitarian regime which dictates what software YOU are allowed to run on "your" hardware.
Login is better on the iOS app as you can use touch id/faceId and not userid/password also the webpage asks for cookies as it can't seem to remember the choice
There seem to be sites for your GP (which mine does via a .nhs.uk domain it used to be via https://account.patientaccess.com/ which still shows appointments but does not allow booking but still allows requests for repeat prescriptions.) or hospital portal for results.