I definitely understand what they’re trying to do here, and I know a lot of people are going to use Oasis once and then never open it again. That’s almost what I was about to do, I’m sure. For this reason, they put all of the information behind a pay wall. It essentially makes the “free” download of Oasis useless.
That said, I’m an avid water drinker. I travel a lot for work and really only drink water — maybe the occasional coffee or tea — and I’m constantly trying to find good, delicious, refreshing water to drink everywhere. So, I’d pay $5/mo but I’m not going to do that if there isn’t an opportunity for me to try Oasis . Pay $5 for the first month but then offer the second month free, I don’t know the answer exactly. But, for a seemingly basic app like this, and I’m sure a lot of work went into the information so the design is a bit of a second priority, you’d think there would be some kind of incentive.
Other apps like Flighty, TV Forecast, and others that I use cost significantly less with just as much data going into it with a better design.
This feedback is for the developer. I’d recommend considering some of the above.