Many Google teams have also been on a similar journey from Java to Kotlin for both Android and the server-side, culminating in over 11m lines of Kotlin code (as of October 2022).

Google's decision to use Rust for new code in Android in order to reduce memory-related flaws appears to be paying off. Memory safety vulnerabilities in Android have been more than halved – a ...

As it stands today, Android apps are generally coded in Kotlin, but Apple is looking to provide its Swift coding language as an alternative.