To be fair, I think most apps require a payment to get the full experience. There is free stuff out there, but I feel like you get what you pay for. The exception is wX. I love wX and use it regularly for it's wealth of info, but I still prefer Radarscope for radar display. I mentioned to wX's developer,
@Joshua Tee, that he should add a donate function, as I would gladly throw some $ his way to keep the app ad-free, and to reward his efforts. I don't mind spending a little to get quality, but YMMV. Just comes down to what you need, what you want, and what you're willing to pay for it.
Have you considered GR or WSV3, or are you strictly looking for something compatible with phones?