However, I also find it misleading. As someone who has been through the process of buying private insurance before: there are a number of sites like this (though none of them as elegant and spare). All of them will give you comparative rate charts. But those rates don't mean anything.
After you select a provider, you have to fill out their application, which is onerous. They then do whatever record pulling they do in their backend and come back to you with an answer, which you can expect to take the form of "we can insure two of you for $JACKED_RATE, and we can't insure the other two at all", at which point you get to spend weeks in their appeals process figuring out which 15 minute doctor visit from 4 years ago put your wife or daughter on a "do-not-cover" list.
I'm not just complaining about the (horrible) US insurance system here. I'm saying that sites like this don't work. No web developer has access to the real information this app purports to have, which is "what can I expect to pay for coverage from providers in my area".
Note also that there are plenty of agents who will do this kind of legwork for you; they're often compensated by affiliate fees from insurers.
(For what it's worth, the identical problem exists with comparative car insurance shopping; you can get rate charts all over the Internet, but it's not until you fill out the application for a specific provider and wait a week that you'll find out how much higher your rate is than the advertised minimum.)
What would be very valuable would be a crowdsourced version of these charts.