iOS 11 developer beta has been around for a while and right now, Apple has released the public beta for iOS 11. The Public beta does not require a developer account and anyone with an Apple ID can download it.
While the iOS 11 developer beta comes with redesign dock, dark mode, unfload unused app, a design control center and lots more.
Where Can I Download it?
Go to beta.apple.com/profile to download the configuration profile for your device.
Once you install, you will be asked to restart your iOS device. After the device restarts, navigate to Settings > General > Software Update and you will see the public beta as an update just as you would any other iOS update.
Since it’s a public beta update, definitely there will be bugs. So if you don’t have any redundant iOS devices, I’ll suggest you wait for the final version when it released.