The program for calculating the time spent on a task?

Question

Time Management

Need a program to calculate the time for a task.
The logic of work is as follows:
1. Create a task.
2. Press the start execution button.
3. After execution, press stop.
4. If we want to continue, we can press start again.
The program should sum up all the time spent on the task.
At the moment I found bitrix24, but the system itself is very large, for solving different tasks and is focused on the work of the company, and not one person. I'm looking for an easier replacement.

Answer 1

https://toggl.com/ - just made for you

Answer 2

As a Hubstaff variant

Answer 3

time doctor

Answer 4

https://www.toptal.com/tracker/ is easier than hubstaff but free.