Hi there,

It is not yet released, and right now no direct indication of a release date. It’s currently in private alpha, but users can signup to be notified when it is ready: Mobile Apps | Bubble

Definitely learn the responsive engine. Most common ‘best practices’ would say 320px width is the most common, but if your responsiveness can hold together to 280px or even 250px, you’re also preparing for users with slight misalignments, larger font libraries (for accessibility, etc. (and for a bit of margin of error!). But the best you can do to is really rely on that responsive engine to build something that degrades /resizes gracefully from full rez (laptop/iPad) down to small screen.

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