Asthmatic teen - does anyone else’s use a peak flow app?

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Teen DD has asthma, not too bad and well managed.

She needs to get better at measuring and recording peak flow though. Paper-based seems so limited - is there a reliable, secure app that’s widely used and recommended?

I use excel

Do you have your own device for measuring peak flow or do you get at done at the doctor’s?
(Sorry, I’m obviously several steps behind you here…I don’t know anything about suitable apps but hoping to learn!)

I use the SaniQ app & it plots them on a graph so easy to pick up on trends etc. I’ve been v poorly & it’s really useful to show docs etc