1st. I personally don't like apps for several reasons.
... Your link is to an phone app, nothing wrong but can not find there any owner informations or anything else just login/register option.Possible network domain which i found using separately search is same company but I'm not sure.Also there aren't enough information (for me) make me to register.Probably I'm from old school but is O.K.for me: only my time was scamed yet not money or another stuffs.Of course I don't said your app is scam but for now I prefer to stay away. We have many options for surveys,offers,etc.
Honestly wish you good luck.