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Feature Ktor Retrofit
Language Kotlin Kotlin/Java
Asynchronous Support Native support through Kotlin coroutines
Native support with coroutines,
RxJava, or callbacks
HTTP Engine Multiplatform (CIO, OkHttp, Jetty, etc.) OkHttp
Serialization Flexible, supports various formats through plugins Gson, Moshi, Jackson, or converters
Multiplatform Yes (JVM, Android, JavaScript, Native, iOS) No (Focused on JVM and Android)
HTTP 2 Support Yes Yes
Websockets Support Yes Not natively, available through OkHttp
Client/Server Both (Can be used to create client and server) Client only
DSL for Configuration Yes, has a type-safe DSL for building HTTP clients No, uses annotations and interfaces
Community and Support Growing, backed by JetBrains Well-established, large community
Customizability Highly customizable and extensible
Customizable with interceptors and
converters
Learning Curve Moderate, requires understanding of coroutines
Easy to moderate, especially for
Retrofit users