seniorKotlin
What is Kotlin annotation processing (KAPT) and KSP?
Updated May 16, 2026
Short answer
KAPT and KSP are tools for generating code during compilation.
Deep explanation
KAPT bridges Java annotation processors into Kotlin but is slow due to Java compatibility layers. KSP (Kotlin Symbol Processing) is a modern, faster alternative that directly processes Kotlin symbols, improving build performance.
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