The app’s main page shows your total caffeine intake, and a list of drinks you’ve logged. To start adding a drink, press the ‘+’ option on the bottom left. Pick your brand: Starbucks, Seattle’s Best, Tim Hortons, Costa Coffee or Haribou, and then pick the drink you had from that brand. Press ‘Add’, and the drink will be added to the main page, along with its amount of caffeine in milligrams (mg).

You can manually reset your total caffeine intake by pressing ‘AC’.