https://techcrunch.com/2019/06/24/apple-just-released-the-first-ios-and-ipados-13-beta-to-everyone/

This is your opportunity to get a glimpse of the future of iOS — and iPadOS. Apple just released the first public beta of iOS 13 and iPadOS 13, the next major version of the operating systems for the iPhone and iPad. Unlike developer betas, everyone can download those betas without a $99 developer account. But don’t forget, it’s a beta.

The company still plans to release the final version of iOS and iPadOS 13.0 this fall (usually September). But Apple is going to release betas every few weeks over the summer. It’s a good way to fix as many bugs as possible and gather data from a large group of users.