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Aqua
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| Developer | Apple |
|---|---|
| Introduced | January 2000 (Macworld) · shipped with Mac OS X (2001) |
| Type | macOS design language |
| Succeeded by | Liquid Glass (macOS Tahoe, 2025) |
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Aqua was the face of Mac OS X for a quarter century — the water-themed design language Steve Jobs unveiled with the promise that "we made the buttons on the screen look so good you'll want to lick them." Gel-like buttons, pinstripes, drop shadows, and the genie effect announced that the Mac's NeXT-based rebirth would look as new as it was.
Aqua never stood still: the candy gels gave way to brushed metal, then to the unified gray of the late 2000s; OS X Yosemite (2014) flattened it in iOS 7's image; macOS Big Sur (2020) rounded and lightened everything toward iPad idioms. The name outlived most of its original pixels — officially, every macOS appearance from 10.0 through the mid-2020s was still "Aqua."
Aqua set the template for consumer OS design in the 2000s and defined the Mac's personality through four processor architectures. Its era closed when Liquid Glass arrived with macOS Tahoe — the first design language since 2001 to replace, rather than renovate, what Aqua began.
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