Kyo RC4 is out, and it's yet another big one 🚀 🧩 kyo-ui: web UIs as pure values, rich reactivity across clients and servers 🌐 kyo-browser: drive a real browser with automatic settlement across all platforms 🔌 kyo-ffi: bind a C library once, call it from JVM, JS, and Native 😱 🪄 kyo-compat: write a library once, ship it to six effect backends (Kyo, ZIO, Cats Effect, Future, Ox, Twitter Future) 🕸️ WebAssembly is now a fourth cross-build target, published to Maven Central The cherry on top? The project is finally fully documented and has a new website 🥳

Scala has long been a magnet for innovation and, although that's actually desirable, the consequent fragmentation of the ecosystem is a major issue for library authors. And yes, Kyo worsens it. It's time for a proper solution! Forget F[_], meet kyo-compat: write your library once, support ZIO, Cats Effect, Future, Ox, Twitter Future, and Kyo 🪄 ✅ Zero overhead: every method is inline and lowers to the backend's own primitive. No typeclass dispatch ✅ No degraded features: capabilities like tracing work as if using the underlying libraries directly ✅ Fully isolated: each artifact depends only on its target library. No Kyo runtime, zero dependencies ✅ SBT plugin: cross-publishes every backend from one source tree One source. Every stack.