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Server-side Swift - Perfect

One language to rule them all.
Wouldn’t it be amazing if you could develop every aspect of your apps, front and back end, all using Swift™? We think so. That’s the vision behind Perfect. Perfect is the first enterprise-grade web server and web toolkit for the Swift programming language.

If you’re already developing in Swift and you need backend server software, Perfect eliminates the need to choose and learn a backend language by allowing you to use Swift for all your coding.

Perfect.org

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