They are technically impossible and almost always malicious.
The allure of a magic converter that instantly turns Android apps into iPhone apps is understandable. No one likes to leave behind apps they have grown to love. However, technology does not work by wishful thinking. The differences between Android and iOS are not superficial — they run all the way down to the CPU instruction set, the operating system kernel, and the very philosophy of how apps should be built and secured. apk to ipa converter online ios