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Apple has just seeded the first beta versions of OS X El Capitan and iOS 9. Registered iOS and Mac developers can log into Developer Center to access the betas, as well as release notes and other info. Apple says iOS 9 will be compatible with the same devices as iOS 8, so devices with A5 chips and newer should work.

For those who missed the WWDC keynote this morning, Apple offered viewers previews of the future of both Mac OS and iOS platforms. OS X El Capitan brings about several under-the-hood improvements, as well as some nice new gesture and UI features, and iOS 9 includes a smarter Siri, better battery life and more.

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Both operating systems should see a number of beta releases over the next few months, as Apple prepares for a public release in the fall. We’re installing these initial betas now, so make sure you stay tuned to iDownloadBlog for more WWDC and iOS/OS X/watch OS coverage throughout today, and the rest of the week.