Block & Flow is a free productivity iOS application and Google Chrome extension that uses the pomodoro technique (short work intervals followed by brief, regular breaks) and provides users with self-generated data about how they spend their time. Users create a number of categories to describe work activities (e.g. writing, email, studying, etc), then assign each of these tasks a color. Next, users select from their self-designed categories as they start to work. A timer, in the shape of block, appears on the screen for 25 minutes. Once this time is over, users are prompted to take a 5 minute break. Block and Flow is unique from other pomodoro devices in that users can then view the amount of time - or total blocks - they spend each week on each of their self-created categories. This allows users to regularly assess and adjust their work habits and productivity.