USB OTG Checker is easy to test USB OTG on Android phone.
USB OTG cable-Any USB device.

USB OTG Checker application checks whether USB Host support is enabled. On rooted devices an attempt to enable USB support can be performed.
You can check here is your device is compatible for OTG or not check here easily.

USB OTG Checker is supporting free tool that can quickly and effectively to free fully check and verify your Android device system USB OTG capabilities without Rooted your Android Phone or Tablet.
If your device can support USB OTG then mean that your device can be use to connect to standard USB input device such as keyboard external storage and usb flash drive etc.