Ktor Client is the stronger choice once your Kotlin code needs to run past the JVM; Retrofit is still the safer default for an Android-only or backend-only app. Retrofit is maintained by Square and sits at 3.0.0 today, built on OkHttp 4.12, while Ktor Client comes from JetBrains as part of the Ktor framework, which reached its 1.0 release in November 2018 and its 3.x line in October 2024.
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