I've used it on and off for a while, but the habit just hasn't stuck for me. However, a friend is the founder of https://timechi.com https://timechi.com - a dig

I've used it on and off for a while, but the habit just hasn't stuck for me. However, a friend is the founder of https://timechi.com https://timechi.com - a digital clock that manages your pomodoro (or whatever style of time boxing you want to do), and connects to your computer/browser to block things from interupting you. The physical clock has the added benefit of being displayed to co-workers in an open office space that you're currently busy.