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It's far more likely lemmy will be receiving 3rd party apps in the near future, meanwhile kbin's API is still nonexistent as the developer has far more pressing work to focus on to get the service running nice and smoothly.
Not that's really a "downside" to kbin or anything like that, since the mobile web UI is fantastic already and made even better by some great user styles & scripts; I'm currently using it via Firefox mobile and thanks to kbin's PWA support it works great with the container "Install" feature in the browser (has it's own icon, no browser title bar, but still affected by add-ons).But tbh, until the federation issues with all these different instances being overloaded gets sorted out, I'll be using both kbin and lemmy.