Dev Chart Iphone app

I'm probably preaching to the converting here but while on the subject of apps, I've always used the Massive Dev Chart online as it is a fantastic free resource.
As I pretty much only use Rodinal which comes with no times for my usual films of TriX 35mm and Neopan 100 or 400 120 its really helped out over the years when I keep forgetting.
With the Iphone app it not only has the times but also works doubles up as a timer counting down all the processes - you can even amend times as I need to with my DIY rotary setup.
Awesome and well worth coughing up for if you dev your own b/w films.