Ready to Launch... is it necessary to create a company?

US based. I have vibe coded an app over the past six months, while my sister is working on GTM plan, and we're hoping to launch in the next month.

Is it necessary to create a company to be protected? We don't want to be personally liable for anything once it goes live, however do not collect any financial information.

Interested in hearing what others have done who have launched their app or are gearing up to launch.