Before I started my own company, I worked as a software developer for a New York media company. I had a colleague—let’s call him Neil—who was a brilliant designer. But he was also a perfectionist.

Conditions like A.D.H.D. and autism can make starting and completing tasks feel impossible, but experts say there are workarounds. By Christina Caron The pomodoro technique. Power poses. Planners.

I wouldn’t call myself a productivity guru, but I have tested hundreds of productivity apps, including to-do list apps. However, I found the standard to-do list apps are easy to use but often lack ...