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Koin - a pragmatic lightweight dependency injection framework for Kotlin
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What is KOIN?

A pragmatic lightweight dependency injection framework for Kotlin developers.

Written in pure Kotlin, using functional resolution only: no proxy, no code generation, no reflection.

Koin is a DSL, a light container and a pragmatic API

Official Website 👉

Latest News 🌐

Getting Help 🚒


Any question about Koin usage?

Articles, Videos & other resources 🎉

Online resources about Koin - Talking about Koin

Reporting issues 🚑

Found a bug or a problem on a specific feature? Open an issue on Github issues

Contributing 🛠

Want to help or share a proposal about Koin? problem on a specific feature?

  • Open an issue to explain the issue you want to solve Open an issue
  • Come talk on slack #koin-dev channel
  • After discussion to validate your ideas, you can open a PR or even a draft PR if the contribution is a big one Current PRs

Additional readings about basic setup:


Current Version

// latest stable
koin_version = '2.1.5'



Check that you have the jcenter repository.

// Add Jcenter to your repositories if needed
repositories {


Pick one of your Koin dependency:

Gradle Plugin

buildscript {
    repositories {
    dependencies {
        classpath "org.koin:koin-gradle-plugin:$koin_version"

apply plugin: 'koin'

Core features

// Koin for Kotlin
implementation "org.koin:koin-core:$koin_version"
// Koin extended & experimental features
implementation "org.koin:koin-core-ext:$koin_version"
// Koin for Unit tests
testImplementation "org.koin:koin-test:$koin_version"
// Koin for Java developers is now part of core
// implementation "org.koin:koin-java:$koin_version"


// Koin for Android
implementation "org.koin:koin-android:$koin_version"
// Koin Android Scope features
implementation "org.koin:koin-android-scope:$koin_version"
// Koin Android ViewModel features
implementation "org.koin:koin-android-viewmodel:$koin_version"
// Koin Android Experimental features
implementation "org.koin:koin-android-ext:$koin_version"


// Koin AndroidX Scope features
implementation "org.koin:koin-androidx-scope:$koin_version"
// Koin AndroidX ViewModel features
implementation "org.koin:koin-androidx-viewmodel:$koin_version"
// Koin AndroidX Fragment features
implementation "org.koin:koin-androidx-fragment:$koin_version"
// Koin AndroidX Experimental features
implementation "org.koin:koin-androidx-ext:$koin_version"


// Koin for Ktor Kotlin
implementation "org.koin:koin-ktor:$koin_version"


Declare a Koin module

Write with the Koin DSL what you need to assemble:

// Given some classes 
class Controller(val service : BusinessService) 
class BusinessService() 

// just declare it 
val myModule = module { 
  single { Controller(get()) } 
  single { BusinessService() } 

Starting Koin

Use the startKoin() function to start Koin in your application.

In a Kotlin app:

fun main(vararg args : String) { 
  // start Koin!
  startKoin {
    // your modules

In an Android app:

class MyApplication : Application() {
  override fun onCreate(){
    // start Koin!
    startKoin {
      // Android context
      // modules

Talking about Koin


Videos & Podcasts

Koin Developers Hub


This project exists thanks to all the people who contribute. [Contribute].


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