What is it with forums and jumping on people instead of answering the question!
Dear OP,
I use
https://www.logbook.aero/home as an online backup along side my paper logbook. I think there is an app to go with this but am not 100% sure as i never looked. I think in time you will find having a paper log book isnt so bad. With regards to being worried about "forgetting it" The ONE thing you will always take with you when you go flying is your flying bag - This for me held
> KneeBoard
> Chart and chart peripherals (pens, ruler, square compass CRP-1) etc
> LOG BOOK
> Credit Card
> Tablet (sky demon)
So you'll probably find you wont forget it as much as you think.
I am PPL fixed wing but I guess the requirements are pretty much the same. I also have and did use a fairly comprehensive Excel spreadsheet I put together which adds up times etc. If you would like a copy to have a look at PM me your email and i'll send it over.
Its worth noting as well, that when I applied for my PPL I DID NOT need to send my logbook to the CAA. As long as which ever software you use is capable of out putting an .xls .csv or pdf file this is sufficient to attach to the CAA's online application form.
That got lengthy sorry about that! Best of luck with your PPL(H).