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I don't think Slack is a HTML5 app, at least on Android. The apk contains ~2.5MB of bytecode and half a meg of layouts.

Wow. Indeed. thanks! I really thought that they were HTML5 based on how similar the HTML5 version is compared to the Android experience. Thanks again!

I think Slack is partially HTML5 and partially native on mobile.

iOS version is also a native app. As they look almost identical to web version, lots of people assume it's HTML5.

I've already asked them this question. Slack is native.

The desktop app is HTML5