Helpful App
I found myself jumping to answer emails when the icon popped up making me lose my focus. With this app I have made the decision to only check email on the breaks therefore allowing me to not lose focus on my work. Just having the "ding" tells me when to focus and when to check email or get something to drink. I feel it has increased my productivity. Its worth the paid version to adjust times and number of sessions to fit your needs.
Kristin620 about
Focus Keep Free : Work & Study Timer, v1.8.4