It's a beautiful site and product.
However, the original inventor of the Pomodoro technique explicitly advocates a "low tech" approach - a mechanical kitchen timer, because he argued that the tactile and auditory elements (i.e., the turning moves and ticking sounds) get associated with the elements of the techniques in the human brain.
It would be interesting to evaluate both variants of the approach in a scientific experiment.
https://www.amazon.com/-/en/38-1005/dp/B00335P518 - about €7 or $13, depending on your geography
However, the original inventor of the Pomodoro technique explicitly advocates a "low tech" approach - a mechanical kitchen timer, because he argued that the tactile and auditory elements (i.e., the turning moves and ticking sounds) get associated with the elements of the techniques in the human brain.
It would be interesting to evaluate both variants of the approach in a scientific experiment.
https://www.amazon.com/-/en/38-1005/dp/B00335P518 - about €7 or $13, depending on your geography