What is the best app for running a photo contest?

[katazoom]

We sell vinyl wall decals. Our product lends itself to social media. We are going to run a monthly contest for the best/most creative customer photo. What is the best app for this?

[DavidKonigsberg]

The best is wildfire but its very expensive I like - snapapp , woobox and wishpond

[katazoom]

Thanks. I actually used wildfire with great success before Google bought them. Now they want $1,500 per month which is not in the budget.

I went with Woobox.