Be Focused Pro
Over at The Sweet Setup, Be Focused Pro was picked as the best pomodoro app for Mac and iOS. What is pomodoro? The pomodoro method uses a timer to break work down into intervals of 25 minutes.
Be Focused Pro was chosen as favorite pomodoro app for macOS. It has a simple and clean user interface that provides easy access to timers and provides enough additional features without creating clutter that give it enough power to fit just about any workflow.
Read the entire review at The Sweet Setup, and you can download the iOS ($1.99) and macOS ($4.99) apps on their respective stores.