Thanks for the replies.
I am not recording my time on paper or mobile and just trying to remember my start time and next break needed.
I do know the rules, it’s just that forget to take them when busy at yard. Once I get on a truck to drive it can be obvious how long have been driving and when to take a break, using the tacho.
Just wondered if it was an easier way by using an app.
The obvious way is to write down my sign in work time on a piece of paper or as Normac suggested using count down or alarm on mobile, since my start and finish times can be irregular.