diff --git a/android/koin-android/src/main/java/org/koin/android/ext/koin/KoinExt.kt b/android/koin-android/src/main/java/org/koin/android/ext/koin/KoinExt.kt
index 37e333168..40ef4d33c 100644
--- a/android/koin-android/src/main/java/org/koin/android/ext/koin/KoinExt.kt
+++ b/android/koin-android/src/main/java/org/koin/android/ext/koin/KoinExt.kt
@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+@file:OptIn(KoinInternalApi::class)
+
 package org.koin.android.ext.koin
 
 import android.app.Application
@@ -39,8 +41,6 @@ import java.util.*
  * Setup Android Logger for Koin
  * @param level
  */
-@OptIn(KoinInternalApi::class)
-
 fun KoinApplication.androidLogger(
         level: Level = Level.INFO,
 ): KoinApplication {
diff --git a/android/koin-android/src/main/java/org/koin/androidx/scope/LifecycleViewModelScopeDelegate.kt b/android/koin-android/src/main/java/org/koin/androidx/scope/LifecycleViewModelScopeDelegate.kt
index 178faf830..689fee05c 100644
--- a/android/koin-android/src/main/java/org/koin/androidx/scope/LifecycleViewModelScopeDelegate.kt
+++ b/android/koin-android/src/main/java/org/koin/androidx/scope/LifecycleViewModelScopeDelegate.kt
@@ -6,12 +6,14 @@ import androidx.lifecycle.DefaultLifecycleObserver
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleOwner
 import org.koin.core.Koin
+import org.koin.core.annotation.KoinInternalApi
 import org.koin.core.component.getScopeName
 import org.koin.core.scope.Scope
 import kotlin.properties.ReadOnlyProperty
 import kotlin.reflect.KProperty
 
 //TODO Deprecate
+@OptIn(KoinInternalApi::class)
 class LifecycleViewModelScopeDelegate(
         private val lifecycleOwner: ComponentActivity,
         private val koin : Koin,
diff --git a/android/koin-android/src/test/java/org/koin/test/android/AndroidModuleTest.kt b/android/koin-android/src/test/java/org/koin/test/android/AndroidModuleTest.kt
index 99c12d1a6..ce918998b 100644
--- a/android/koin-android/src/test/java/org/koin/test/android/AndroidModuleTest.kt
+++ b/android/koin-android/src/test/java/org/koin/test/android/AndroidModuleTest.kt
@@ -7,7 +7,9 @@ import org.junit.Assert.assertTrue
 import org.junit.Test
 import org.koin.android.ext.koin.androidApplication
 import org.koin.android.ext.koin.androidContext
+import org.koin.core.annotation.KoinInternalApi
 import org.koin.core.logger.EmptyLogger
+import org.koin.core.logger.PrintLogger
 import org.koin.dsl.koinApplication
 import org.koin.dsl.module
 import org.koin.test.KoinTest
@@ -16,6 +18,7 @@ import org.mockito.Mockito.mock
 /**
  * Android Module Tests
  */
+@OptIn(KoinInternalApi::class)
 class AndroidModuleTest : KoinTest {
 
     companion object {
@@ -95,6 +98,6 @@ class AndroidModuleTest : KoinTest {
             modules(SampleModule)
         }.koin
 
-        assertTrue(koin.logger is EmptyLogger)
+        assertTrue(koin.logger is PrintLogger)
     }
 }
\ No newline at end of file
diff --git a/android/koin-android/src/test/java/org/koin/test/android/ext/koin/KoinExtTest.kt b/android/koin-android/src/test/java/org/koin/test/android/ext/koin/KoinExtTest.kt
index 3c8ca309c..c8b1ecc31 100644
--- a/android/koin-android/src/test/java/org/koin/test/android/ext/koin/KoinExtTest.kt
+++ b/android/koin-android/src/test/java/org/koin/test/android/ext/koin/KoinExtTest.kt
@@ -18,6 +18,7 @@ import org.koin.core.logger.Logger
 import org.koin.core.logger.MESSAGE
 import org.koin.core.registry.saveProperties
 
+@OptIn(KoinInternalApi::class)
 class KoinExtTest {
 
     @Test
diff --git a/core/koin-core/src/commonMain/kotlin/org/koin/core/Koin.kt b/core/koin-core/src/commonMain/kotlin/org/koin/core/Koin.kt
index 01a98bc01..dcf7efda7 100644
--- a/core/koin-core/src/commonMain/kotlin/org/koin/core/Koin.kt
+++ b/core/koin-core/src/commonMain/kotlin/org/koin/core/Koin.kt
@@ -22,7 +22,9 @@ import org.koin.core.component.getScopeName
 import org.koin.core.error.ScopeNotCreatedException
 import org.koin.core.extension.ExtensionManager
 import org.koin.core.logger.EmptyLogger
+import org.koin.core.logger.Level
 import org.koin.core.logger.Logger
+import org.koin.core.logger.PrintLogger
 import org.koin.core.module.Module
 import org.koin.core.module.flatten
 import org.koin.core.parameter.ParametersDefinition
@@ -59,6 +61,7 @@ class Koin {
     @KoinInternalApi
     val extensionManager = ExtensionManager(this)
 
+    @KoinInternalApi
     var logger: Logger = EmptyLogger()
         private set
 
diff --git a/core/koin-core/src/commonMain/kotlin/org/koin/core/logger/PrintLogger.kt b/core/koin-core/src/commonMain/kotlin/org/koin/core/logger/PrintLogger.kt
new file mode 100644
index 000000000..de8f26ace
--- /dev/null
+++ b/core/koin-core/src/commonMain/kotlin/org/koin/core/logger/PrintLogger.kt
@@ -0,0 +1,8 @@
+package org.koin.core.logger
+
+/**
+ * Multiplatform Basic Logger
+ *
+ * @author Arnaud Giuliani
+ */
+expect class PrintLogger(level: Level = Level.INFO) : Logger
\ No newline at end of file
diff --git a/core/koin-core/src/commonMain/kotlin/org/koin/core/registry/PropertyRegistry.kt b/core/koin-core/src/commonMain/kotlin/org/koin/core/registry/PropertyRegistry.kt
index 5c4373080..43b9aeafd 100644
--- a/core/koin-core/src/commonMain/kotlin/org/koin/core/registry/PropertyRegistry.kt
+++ b/core/koin-core/src/commonMain/kotlin/org/koin/core/registry/PropertyRegistry.kt
@@ -16,6 +16,7 @@
 package org.koin.core.registry
 
 import org.koin.core.Koin
+import org.koin.core.annotation.KoinInternalApi
 import org.koin.mp.KoinPlatformTools
 
 /**
@@ -24,6 +25,7 @@ import org.koin.mp.KoinPlatformTools
  *
  * @author Arnaud Giuliani
  */
+@OptIn(KoinInternalApi::class)
 @Suppress("UNCHECKED_CAST")
 class PropertyRegistry(internal val _koin: Koin) {
 
diff --git a/core/koin-core/src/commonTest/kotlin/org/koin/dsl/KoinAppCreationTest.kt b/core/koin-core/src/commonTest/kotlin/org/koin/dsl/KoinAppCreationTest.kt
index 30bb98dce..792648eb7 100644
--- a/core/koin-core/src/commonTest/kotlin/org/koin/dsl/KoinAppCreationTest.kt
+++ b/core/koin-core/src/commonTest/kotlin/org/koin/dsl/KoinAppCreationTest.kt
@@ -1,5 +1,6 @@
 package org.koin.dsl
 
+import org.koin.core.annotation.KoinInternalApi
 import org.koin.core.context.startKoin
 import org.koin.core.context.stopKoin
 import org.koin.core.error.KoinAppAlreadyStartedException
@@ -12,6 +13,7 @@ import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.fail
 
+@OptIn(KoinInternalApi::class)
 class KoinAppCreationTest {
 
     @AfterTest
diff --git a/core/koin-core/src/jsMain/kotlin/org/koin/core/logger/PrintLogger.kt b/core/koin-core/src/jsMain/kotlin/org/koin/core/logger/PrintLogger.kt
index ad2e0ea09..c5619235d 100644
--- a/core/koin-core/src/jsMain/kotlin/org/koin/core/logger/PrintLogger.kt
+++ b/core/koin-core/src/jsMain/kotlin/org/koin/core/logger/PrintLogger.kt
@@ -19,7 +19,7 @@ package org.koin.core.logger
  * Logger that print on system.out
  * @author - Arnaud GIULIANI
  */
-class PrintLogger(level: Level = Level.INFO) : Logger(level) {
+actual class PrintLogger actual constructor(level: Level) : Logger(level) {
 
     override fun display(level: Level, msg: MESSAGE) {
         println("[$level] $KOIN_TAG $msg")
diff --git a/core/koin-core/src/jvmMain/kotlin/org/koin/core/logger/PrintLogger.kt b/core/koin-core/src/jvmMain/kotlin/org/koin/core/logger/PrintLogger.kt
index abf1f86a6..393f68f46 100644
--- a/core/koin-core/src/jvmMain/kotlin/org/koin/core/logger/PrintLogger.kt
+++ b/core/koin-core/src/jvmMain/kotlin/org/koin/core/logger/PrintLogger.kt
@@ -19,7 +19,7 @@ package org.koin.core.logger
  * Logger that print on system.out
  * @author - Arnaud GIULIANI
  */
-class PrintLogger(level: Level = Level.INFO) : Logger(level) {
+actual class PrintLogger actual constructor(level: Level) : Logger(level) {
 
     private val printer = if (level >= Level.WARNING) System.err else System.out
 
diff --git a/core/koin-core/src/jvmMain/kotlin/org/koin/core/registry/PropertyRegistryExt.kt b/core/koin-core/src/jvmMain/kotlin/org/koin/core/registry/PropertyRegistryExt.kt
index 336b0eb89..16c3c997a 100644
--- a/core/koin-core/src/jvmMain/kotlin/org/koin/core/registry/PropertyRegistryExt.kt
+++ b/core/koin-core/src/jvmMain/kotlin/org/koin/core/registry/PropertyRegistryExt.kt
@@ -1,6 +1,9 @@
+@file:OptIn(KoinInternalApi::class)
+
 package org.koin.core.registry
 
 import org.koin.core.Koin
+import org.koin.core.annotation.KoinInternalApi
 import org.koin.core.error.NoPropertyFileFoundException
 import java.util.*
 
diff --git a/core/koin-core/src/jvmTest/kotlin/org/koin/core/DebugLogTest.kt b/core/koin-core/src/jvmTest/kotlin/org/koin/core/DebugLogTest.kt
index 37ed03575..3ccb14a5e 100644
--- a/core/koin-core/src/jvmTest/kotlin/org/koin/core/DebugLogTest.kt
+++ b/core/koin-core/src/jvmTest/kotlin/org/koin/core/DebugLogTest.kt
@@ -1,10 +1,12 @@
 package org.koin.core
 
 import org.junit.Test
+import org.koin.core.annotation.KoinInternalApi
 import org.koin.core.context.startKoin
 import org.koin.core.context.stopKoin
 import org.koin.core.logger.Level
 
+@OptIn(KoinInternalApi::class)
 class DebugLogTest {
 
     @Test
diff --git a/core/koin-core/src/nativeMain/kotlin/org/koin/core/logger/PrintLogger.kt b/core/koin-core/src/nativeMain/kotlin/org/koin/core/logger/PrintLogger.kt
index ad2e0ea09..c5619235d 100644
--- a/core/koin-core/src/nativeMain/kotlin/org/koin/core/logger/PrintLogger.kt
+++ b/core/koin-core/src/nativeMain/kotlin/org/koin/core/logger/PrintLogger.kt
@@ -19,7 +19,7 @@ package org.koin.core.logger
  * Logger that print on system.out
  * @author - Arnaud GIULIANI
  */
-class PrintLogger(level: Level = Level.INFO) : Logger(level) {
+actual class PrintLogger actual constructor(level: Level) : Logger(level) {
 
     override fun display(level: Level, msg: MESSAGE) {
         println("[$level] $KOIN_TAG $msg")
diff --git a/core/koin-test-junit4/src/main/kotlin/org/koin/test/KoinTestRule.kt b/core/koin-test-junit4/src/main/kotlin/org/koin/test/KoinTestRule.kt
index af566b5e0..e11a02aa8 100644
--- a/core/koin-test-junit4/src/main/kotlin/org/koin/test/KoinTestRule.kt
+++ b/core/koin-test-junit4/src/main/kotlin/org/koin/test/KoinTestRule.kt
@@ -19,6 +19,7 @@ import org.junit.rules.TestRule
 import org.junit.rules.TestWatcher
 import org.junit.runner.Description
 import org.koin.core.Koin
+import org.koin.core.annotation.KoinInternalApi
 import org.koin.core.context.startKoin
 import org.koin.core.context.stopKoin
 import org.koin.dsl.KoinAppDeclaration
@@ -30,6 +31,7 @@ import org.koin.mp.KoinPlatformTools
  * @author Nick Cipollo
  * @author Jan Mottl
  */
+@OptIn(KoinInternalApi::class)
 class KoinTestRule private constructor(private val appDeclaration: KoinAppDeclaration) : TestWatcher() {
 
     private var _koin: Koin? = null
diff --git a/core/koin-test/src/commonMain/kotlin/org/koin/test/check/CheckModules.kt b/core/koin-test/src/commonMain/kotlin/org/koin/test/check/CheckModules.kt
index 997b7eafc..44a6e4cd1 100644
--- a/core/koin-test/src/commonMain/kotlin/org/koin/test/check/CheckModules.kt
+++ b/core/koin-test/src/commonMain/kotlin/org/koin/test/check/CheckModules.kt
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 @file:Suppress("UNUSED_PARAMETER")
+@file:OptIn(KoinInternalApi::class)
 
 package org.koin.test.check