Does anyone know how I can see how much data is being used while doing Skritter on the non html5 page?

Do you have an android, or an Iphone? I know it drains the heck out of the bat. I use my app on bus rides, in the middle of work, for probably 15 minutes a day. And I haven't had any over charges on my phone bill

If android go to phone settings, data, connections, mobile, then look at chrome to see how may mb you've used. Although its not specific to skritter but if chrome is all you use skritter for then you'll have a good idea.
I also use html5 on mobile data (500mb pm) and I still have 200 left, and only because of maps, not chrome!

What device are you using Mattaisu? Seems like the flash site uses relatively minimal data, but never measured it. My guess is all it should be downloading on study page is word info, so fractions of MBs an hour, but that's a guess based on what ios and html5 download as initial download ...