The OV Balance Checker, developed by Dion Nicolaas, is a free Android app that helps you check the balance of your Dutch OV-Chipcard. With this app, you can easily point your device's camera at the OV-Chipcard, and it will recognize the card number and show you the balance. The app retrieves the balance from the ov-chipkaart website and doesn't store any data on the device or send it to any other server.

This app is very user-friendly and convenient for anyone who uses public transportation in the Netherlands. Additionally, if the balance is not enough, you can order new balance for that card by pressing the €-button, which will redirect you to the ov-chipkaart website with the card's long number already filled in. Overall, the OV Balance Checker is a useful tool for anyone who wants to keep track of their OV-Chipcard balance without any hassle.