Theseus
Liquid Glass UI, backported to iOS 13+ and open source.
Theseus launched on December 31, 2025 with 9 votes, #934 of 11,628 launches that month and more than 50% of that year's launches.
What it does
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.
Theseus is a lightweight Swift Package that brings iOS 26 Liquid Glass look and feel all the way back to iOS 13+. - GitHub - valzevul/Theseus: Theseus is a lightweight Swift Package that brings iOS 26 Liquid Glass look and feel all the way back to iOS 13+.
Theseus gives you translucent UI components with blur, refraction, glare, and spring animations – the iOS 26 look, backported to iOS 13+. Same ship, rebuilt plank by plank for older waters. Because some of us watched Apple unveil Liquid Glass at WWDC 2025 and quietly wondered if they could drop support for iOS 13. This is for everyone still supporting devices fromfrom github.com
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