The best alternatives to Chronos are Pomodoro Time, Flow, and pomodone. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Chronos?
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PomoDone is the easiest way to track your workflow using Pomodoro technique, on top of your current task management service. It helps you to focus on the most important tasks and improves mental agility, so you DO more.
Pomodoro² is a pomodoro timer with one purpose: to help you stay focused on your work. Based on the time management method that has been proven to increase productivity, with no ads or distractions, this gorgeous timer is a great way for you to get work done.