diff --git a/gradle.properties b/gradle.properties
index 1759e8f..cd06544 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -8,6 +8,6 @@ android.enableJetifier=true
 
 # Project data
 
-group=project_group
+group=dev.akkihi
 version=0.0.1
 android_code_version=1
diff --git a/lib/src/commonMain/kotlin/project_group/Library.kt b/lib/src/commonMain/kotlin/project_group/Library.kt
deleted file mode 100644
index 424d112..0000000
--- a/lib/src/commonMain/kotlin/project_group/Library.kt
+++ /dev/null
@@ -1,7 +0,0 @@
-package project_group
-
-class Library {
-    fun someLibraryMethod(): Boolean {
-        return true
-    }
-}
diff --git a/lib/src/commonTest/kotlin/project_group/LibraryTest.kt b/lib/src/commonTest/kotlin/project_group/LibraryTest.kt
deleted file mode 100644
index 84b573a..0000000
--- a/lib/src/commonTest/kotlin/project_group/LibraryTest.kt
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
- * This Kotlin source file was generated by the Gradle 'init' task.
- */
-package project_group
-
-import kotlin.test.Test
-import kotlin.test.assertTrue
-
-class LibraryTest {
-    @Test fun testSomeLibraryMethod() {
-        val classUnderTest = Library()
-        assertTrue(classUnderTest.someLibraryMethod(), "someLibraryMethod should return 'true'")
-    }
-}
diff --git a/lib/src/main/AndroidManifest.xml b/lib/src/main/AndroidManifest.xml
deleted file mode 100644
index 03c9554..0000000
--- a/lib/src/main/AndroidManifest.xml
+++ /dev/null
@@ -1 +0,0 @@
-<manifest package="project_group.lib"/>
\ No newline at end of file
diff --git a/lib/build.gradle b/logger/build.gradle
similarity index 100%
rename from lib/build.gradle
rename to logger/build.gradle
diff --git a/logger/src/commonMain/kotlin/Logger.kt b/logger/src/commonMain/kotlin/Logger.kt
new file mode 100644
index 0000000..2359fed
--- /dev/null
+++ b/logger/src/commonMain/kotlin/Logger.kt
@@ -0,0 +1,40 @@
+package truth.simple.kmp.logger.common
+
+
+enum class LogLevel {
+    VERBOSE,
+    INFO,
+    WARNING,
+    ERROR,
+    ASSERT,
+    DEBUG
+}
+
+interface Logger {
+    fun log (level: LogLevel, message: String, tag: String? = null, throwable: Throwable? = null)
+    companion object : Logger {
+        var DEFAULT: Logger = Logger("app")
+        override fun log(level: LogLevel, message: String, tag: String?, throwable: Throwable?) = DEFAULT.log(level, message, tag, throwable)
+
+        operator fun invoke (log: (level: LogLevel, message: String, tag: String?, throwable: Throwable?) -> Unit) = CallbackLogger(log)
+    }
+}
+
+class CallbackLogger(
+    private val logger: (level: LogLevel, message: String, tag: String?, throwable: Throwable?) -> Unit
+) : Logger {
+    override fun log(level: LogLevel, message: String, tag: String?, throwable: Throwable?) = logger(level, message, tag, throwable)
+}
+
+
+expect fun Logger(
+    defaultTag: String,
+    filter: (l: LogLevel, m: String, t: String, Throwable?) -> Boolean
+) : Logger
+
+fun Logger(
+    defaultTag: String,
+    levels: Set<LogLevel> = LogLevel.values().toSet()
+): Logger = Logger (defaultTag) { l, _, _, _ ->
+    l in levels
+}
diff --git a/logger/src/jsMain/kotlin/ActualLogger.kt b/logger/src/jsMain/kotlin/ActualLogger.kt
new file mode 100644
index 0000000..5e4497f
--- /dev/null
+++ b/logger/src/jsMain/kotlin/ActualLogger.kt
@@ -0,0 +1,28 @@
+package truth.simple.kmp.logger.common
+
+fun Logger(
+    messageFormatter: (l: LogLevel, m: String, t: String?, Throwable?) -> String,
+    filter: (l: LogLevel, m: String, t: String?, Throwable?) -> Boolean
+) = Logger { l, m, t, e ->
+    if (!filter(l, m, t, e)) return@Logger
+    val text = messageFormatter(l,m,t,e)
+    when (l) {
+        LogLevel.VERBOSE,
+        LogLevel.INFO -> console.info(text, e)
+        LogLevel.WARNING -> console.warn(text, e)
+        LogLevel.ERROR,
+        LogLevel.ASSERT -> console.error(text, e)
+        LogLevel.DEBUG -> console.log(text, e)
+    }
+
+}
+
+actual fun Logger(
+    defaultTag: String,
+    filter: (l: LogLevel, m: String, t: String, Throwable?) -> Boolean
+): Logger {
+    return Logger(
+        { l, m, t, e -> "[$l] ${t ?: defaultTag} - $m" },
+        { l, m, t, e -> filter(l, m, t ?: defaultTag, e) }
+    )
+}
\ No newline at end of file
diff --git a/logger/src/jvmMain/kotlin/ActualLogger.kt b/logger/src/jvmMain/kotlin/ActualLogger.kt
new file mode 100644
index 0000000..f471eab
--- /dev/null
+++ b/logger/src/jvmMain/kotlin/ActualLogger.kt
@@ -0,0 +1,26 @@
+package truth.simple.kmp.logger.common
+
+import java.util.logging.Level
+
+actual fun Logger(
+    defaultTag: String,
+    filter: (l: LogLevel, m: String, t: String, Throwable?) -> Boolean
+): Logger {
+    val logger = java.util.logging.Logger.getLogger(defaultTag)
+    return Logger { l, m, t, e ->
+        if (!filter(l, m, t ?: defaultTag, e)) return@Logger
+        val currentLogger = t ?.let { java.util.logging.Logger.getLogger(t) } ?: logger
+        currentLogger.log(
+            when(l) {
+                LogLevel.VERBOSE -> Level.FINEST
+                LogLevel.INFO -> Level.INFO
+                LogLevel.WARNING -> Level.WARNING
+                LogLevel.ERROR -> Level.SEVERE
+                LogLevel.ASSERT -> Level.OFF
+                LogLevel.DEBUG -> Level.ALL
+            },
+            m,
+            e
+        )
+    }
+}
\ No newline at end of file
diff --git a/logger/src/main/AndroidManifest.xml b/logger/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..8c316c2
--- /dev/null
+++ b/logger/src/main/AndroidManifest.xml
@@ -0,0 +1 @@
+<manifest package="dev.akkihi.lib"/>
\ No newline at end of file
diff --git a/logger/src/main/kotlin/ActualLogger.kt b/logger/src/main/kotlin/ActualLogger.kt
new file mode 100644
index 0000000..ec2bed2
--- /dev/null
+++ b/logger/src/main/kotlin/ActualLogger.kt
@@ -0,0 +1,21 @@
+package truth.simple.kmp.logger.common
+
+import android.util.Log
+
+actual fun Logger(
+    defaultTag: String,
+    filter: (l: LogLevel, m: String, t: String, Throwable?) -> Boolean
+): Logger {
+    return Logger { l, m, t, e ->
+        val tag = t ?: defaultTag
+        if (!filter(l, m, t ?: defaultTag, e)) return@Logger
+        when(l) {
+            LogLevel.VERBOSE -> Log.v(tag, m, e)
+            LogLevel.INFO -> Log.i(tag, m, e)
+            LogLevel.WARNING -> Log.w(tag, m, e)
+            LogLevel.ERROR -> Log.e(tag, m, e)
+            LogLevel.ASSERT -> Log.wtf(tag, m, e)
+            LogLevel.DEBUG -> Log.d(tag, m, e)
+        }
+    }
+}
\ No newline at end of file
diff --git a/settings.gradle b/settings.gradle
index 4e2023f..baf3abb 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -1,7 +1,7 @@
-rootProject.name = 'project_name'
+rootProject.name = 'truth_simple_kmp_logger'
 
 String[] includes = [
-    ":lib"
+    ":logger"
 ]