Big Bang: Yello App replaces kWhapp. Our new app catapults you to the next level of experience: You get full transparency about your consumption and your electricity or gas costs. More insight instead of question marks. With the app, you regulate everything to do with your energy contract yourself. No risk, more fun: the Yello app is free and clever. On small tiles you get impulses for your sustainable life and how you can easily save money. Small and quite powerful: your Yello app. Next Level