I am in the same boat (when I close my eyes), so I would like to hear correct answer too. As I see it now, you should at least research existing trademarks and

I am in the same boat (when I close my eyes), so I would like to hear correct answer too. As I see it now, you should at least research existing trademarks and patents then file for a trademark and maybe a provisional patent, which should be relatively affordable ($1k-$5k). Once your app gets good traction and you can demonstrate sustainable growth, you should be able to get seed round enough for robust IP protection and further development.