It's not open source, no. If you're looking for open source Lemmy apps, this site has a pretty comprehensive list: https://lemmyapps.netlify.app/
this post was submitted on 17 Sep 2023
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Ita not open source at all. Just one developer doing the work.
You can contribute by running the beta version when available and reporting bugs.
Is there a way to be enrolled in the beta test program? I did not find the option in the Play store...
The beta sign-up is live now.
I think it might be better to message Ruben himself and check.