Relevant for Apple OSs: https://support.apple.com/en-us/HT209143 https://support.apple.com/en-us/HT209143 "Buypass Class 3 Root CA", which appears to be the ro

Relevant for Apple OSs: https://support.apple.com/en-us/HT209143 https://support.apple.com/en-us/HT209143 "Buypass Class 3 Root CA", which appears to be the root certificate they currently use, is present for all listed iOS versions (7+), which seems like a good sign. Let's Encrypt's "ISRG Root X1" is present in iOS 10+. Similar lists for Android would be wonderful but probably impossible to compile due to ecosystem fragmentation. I guess there is no caniuse.com for root certificates.