Do you guys use separate apps for your calendar, to-do list, and focus timer, or keep everything in one place ?

Lately I noticed that jumping between three or four different apps just to check my schedule, track a daily habit, and start a Pomodoro timer was killing my focus before I even opened my lectures. Half the time I would switch tabs just to set a timer and somehow lose 15 minutes getting distracted.

It bugged me so much that I started coding a simple web tool for my own routine where everything lives on a single screen, so I can just click a task on my daily schedule and start focusing right away.

What does your current study setup look like? Do you prefer dedicated apps for each thing or having an all-in-one workspace ?