Coil32 is a free inductance coil calculator available for Android devices. Developed by Valery Kustarev, this app allows users to calculate the inductance value of a fabricated inductor or the needed number of turns for the desired value of inductance of a homebrew inductor. It is a useful tool for HAMs, Audiophiles, and other radio enthusiasts who need to make DIY inductors.

Coil32 has the capability to calculate single-layer and multi-layer air core inductors, ferrite toroid inductors or chokes, and even flat square coils on PCB. The app is easy to navigate, and the calculations are accurate. The only downside to this app is that it is only available in English.

Overall, Coil32 is a great tool for anyone involved in the DIY inductor world. It is a must-have app for any HAM or Audiophile enthusiast. If you are a native speaker and can help translate this app into other languages such as Indonesian, the developer is looking for assistance and can be contacted via email.