arrow-kt/arrow

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

6580 stars · 472 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Arrow is a Kotlin library for typed functional programming, providing data types like Option and Either, typed error handling with the Raise DSL, concurrency utilities, resilience patterns, and optics for immutable data. It integrates with coroutines and works across JVM, Android, and Kotlin Multiplatform.

Use cases

• handle domain errors in Kotlin with typed errors instead of exceptions
• validate user input and accumulate all validation errors
• manage coroutine resources and graceful shutdown in Ktor servers
• work with immutable data models using optics
• add retry and resilience patterns to Kotlin services
• write functional-style Kotlin with Option and Either types

When to choose

• you write Kotlin (backend, Android, or multiplatform) and want structured, compiler-checked error handling
• you want functional programming abstractions that feel idiomatic to Kotlin
• you need resilience, concurrency, and immutable-data tooling in one ecosystem

When to avoid

• your team prefers exception-based error handling and imperative style
• you work outside the Kotlin/JVM ecosystem
• you want a minimal zero-dependency project and can't accept additional library abstractions

Facets

library · maturity active

error-handling concurrency serialization caching middleware programming-languages developer-tools backend mobile-development cross-platform jvm cross-platform functional-programming kotlin typed-errors monads optics typeclasses coroutines immutability resilience android

Member repositories

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