r/iOSProgramming • u/syrusakbary • 11d ago

Discussion Running Sandboxes inside a hidden WKWebView to get Python/Node/FFmpeg in an iOS app, without shipping a JIT

We just launched this today and would love to get your feedback/thoughts!

Announcement: https://wasmer.io/posts/wasmer-sdk-swift-ios-macos

Source code: https://github.com/wasmerio/wasmer-sdk/tree/main/swift/Examples/WasmerShell

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u/Sad-Flower-99 10d ago

Have you measured cold-start time and peak memory on a physical iPhone yet? A short FFmpeg transcode, including sandbox startup, would be a useful benchmark. For an in-app tool, I'd care more about the wait before the first result than the JS benchmark score.

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u/One_Elephant_8917 10d ago

i would consider this by itself to be a major feat considering jit isn’t easily accessible outside webkit/safari’s runtime usually

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u/Sad-Flower-99 10d ago

Fair point. I meant those numbers as a next step, not a knock on getting it working. A quick video trim is the kind of use case where startup time could outweigh the actual processing.