Why does Pomodoro work for some people and fail for others?

I’ve used Pomodoro on and off for years, and I’ve noticed a pattern: it often works really well at first, then slowly fades away.

While experimenting with my own workflow, I built a small macOS Pomodoro-focused app that combines sessions with simple task tracking, just to explore what helps the habit stick.

I’d love to hear from people who actually use Pomodoro consistently:

• Do you track tasks alongside Pomodoro?
• Do you use strict cycles or flexible sessions?
• What usually causes you to stop using it?

For context, this is the app I’ve been experimenting with:
👉 Focuz – Productivity (macOS App Store)

Really interested in experiences, not promotion.