You can totally use it online - that's where I use it. I've found the phone app to be a bit of a pain on my iPhone anyway. Don't let your phone discourage you from trying it out because I find its to do lists really helpful.
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I've just started using it, as well. This is great! Feels sort of like Fitocracy.
Interesting, I still have a week and half left of school and finals week left and I am actually finished with all but one of my final projects. This could only mean one thing...
This happens every time I miraculously pass a course. I end up goofing off for a whole week when I should have spent that week doing assignments... at least then I could spend the rest of the week goofing. I've always found I can't work at all unless I'm under severe pressure to finish quick.