The British Gas app is a comprehensive utility app that caters to all your energy needs. Available for iPhones, this free app provides you with a range of features to manage your energy consumption and bills easily. You can book an engineer for repairs or maintenance work, even if you don't have cover with them. The app also allows you to track and manage engineer appointments, submit meter readings, and pay bills securely.

The in-app notifications and reminders keep you updated on your energy usage and spending, while the energy budget feature helps you keep track of your expenses. You can also chat with an adviser for any assistance, or purchase HomeCare cover to avoid unexpected repair bills. The app also offers rewards, discounts, and prizes.

The app provides you with real-time energy usage, but it requires a Trio II Smart Energy Monitor. The annual boiler service can be booked through the app, and it's worth noting that the service may be more than 12 months apart.

Overall, the British Gas app is an excellent utility app that provides a range of features to manage your energy bills and consumption with ease.