Kotlin Object VS Kotlin Companion Object - devrath/KotlinAlchemy GitHub Wiki

• In terms of life-cycle there is no difference between the two.
• INITIALIZATION
  • Objects are thread-safe and lazily initialized, It is initialized when it's accessed for the first time.
  • Companion Object is initialized like static members when the container class is initialized for the first time.

If we want to create a singleton we can use object class, If we want to provide some static essence for the class then we use companion object.