Have you heard of any gas receipt apps?

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I have in the past used iBotta (sorry, but I hate iBotta), currently use Fetch Rewards, and Receipt Hog for groceries. I think these are only available right now for US citizens (I could be wrong, go ahead and double check me on that, as I am not sure). But what about gas receipt apps? Does anyone have any of those, where you get cash-back for gas purchases? I heard advertising for an app called Get Upside. It sounds like you download the app (free), and when you are needing to get gas, they will give you options of diffferent gas stations around you, you select one, and then scan your gas receipt, and you get X amount of cents back per gallon. The unfortunate thing is that not all gas stations are on there, but some are in my area that say cash back about 10 cents per gallon. While that's a small amount, sure, if you are a big gas user, this might help you tremendously. But, I have never been paid out from this site/app and can't really recommend it for that reason. I will let you all know if / when I do get paid out from it (may take a while!). Have you heard of or used this one, or any other gas receipt app?