Theseus

Liquid Glass UI, backported to iOS 13+ and open source.

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Theseus is a lightweight Swift Package that backports the iOS 26 Liquid Glass aesthetic to iOS 13+. Inspired by the Ship of Theseus, it rebuilds modern glass UI effects (refraction, depth, and highlights) piece by piece, without relying on new OS features.
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Free
Launch tags:iOS•Open Source•Developer Tools
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Flowstep
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What do you think? …

Vadim Drobinin
Maker
📌
I wanted to bring Liquid Glass to my still-alive iPhone 3GS, but couldn’t find an iOS 4 simulator. So I backported it to iOS 13+ instead. Theseus recreates modern glass depth/refraction/highlights and works as a drop-in replacement for UIKit/SwiftUI TabBars. Would love feedback (and PRs).