Hello, I'd like to build a mobile client for mastodon, lemmy and pixelfed that would be video/image focused with a scrolling ui similar to tiktok or the reddit video viewer.

You would have a sortable/filterable feed with contents from different activitypub networks and would see it full page with a like/voting button on the right and the comments under.

Does anyone know if such a client already exists, and if not, could any dev share starter point links for building such an app ?