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Welcome to ZIO

ZIO is a zero-dependency Scala library for asynchronous and concurrent programming.

Powered by highly-scalable, non-blocking fibers that never waste or leak resources, ZIO lets you build scalable, resilient, and reactive applications that meet the needs of your business.

High-performance. Build scalable applications with 100x the performance of Scala's Future.
Type-safe. Use the full power of the Scala compiler to catch bugs at compile time.
Concurrent. Easily build concurrent apps without deadlocks, race conditions, or complexity.
Asynchronous. Write sequential code that looks the same whether it's asynchronous or synchronous.
Resource-safe. Build apps that never leak resources (including threads!), even when they fail.
Testable. Inject test services into your app for fast, deterministic, and type-safe testing.
Resilient. Build apps that never lose errors, and which respond to failure locally and flexibly.
Functional. Rapidly compose solutions to complex problems from simple building blocks.