Apple typically releases its new operating systems for public beta access a few weeks after WWDC, and iOS 18 is expected to be available in public beta by July.
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Public beta programs allow users to test software as it is being developed to identify bugs or performance issues so that the software team can make any necessary fixes and releases before the new system is made available to the public.
Apple will likely release iOS 18 out of beta this fall, following its iPhone event in September, where it will unveil new models and possibly other hardware.