Timelines is an iPhone app that helps users track and visualize their time usage through an interactive timeline interface. The app provides a clear picture of how time is being spent, enabling users to identify patterns and make improvements to their daily routines.

Users can create timelines for each project or activity they care about and use timers to track their activities. The app allows adding events retrospectively and adjusting their times. With Statistics mode and the interactive timeline, users can quickly scale from a big picture overview down to a single day's activities.

The app includes goal-setting features where users can define daily, weekly, and monthly targets for categories and get rewarded for reaching them. Timelines also offers an Apple Watch version that allows controlling timers without pulling the phone out, featuring one-tap start/stop functionality, digital crown correction, dictation for event names, and offline functionality.

Users can see trends over time through interactive bar charts that show how time spending habits evolve across days, weeks, months, and beyond. The app provides widgets for instant overviews of goals, statistics, individual categories, and tracking status directly on the home screen.

The app integrates with Shortcuts and supports Live Activity features. It's designed for iPhone and Apple Watch users who want to track various activities including sleep, commute, focused work, lunch breaks, family time, and procrastination.