Pretty interesting survey. I hope you managed to launch the app because it would have been great to have something like that.
Some time ago, I conducted a similar survey I needed for research and managed to gather very interesting information. This source https://paperell.net/pay-for-research-papers was a huge help for me because I decided to pay for research papers and have more time for my practical part because it's more important. When the project was finished, I also thought about creating an app, but it turned out to be more complicated than I expected.