PixelFed is good, it's part of the federverse so if you spin up your own server you can choose to lock it to just your friends or anyone else using the software. For their own servers, you inherit what the admins have chosen to federate with. I don't recall if there's a native PixelFed app, but the apps for Mastodon work well enough for it, it just may have a different UX (more Twitter like) for mobile. I use Tusky on Android, but there's a lot of other clients available for Android and iOS.
For Instagram if you still need to use it, Barinsta on Android is a open source client for Insta without a lot of the advertising/algorithm shit being sent your way. I've been using it just to keep an eye on some organizers that use Insta over twitter.
PixelFed is good, it's part of the federverse so if you spin up your own server you can choose to lock it to just your friends or anyone else using the software. For their own servers, you inherit what the admins have chosen to federate with. I don't recall if there's a native PixelFed app, but the apps for Mastodon work well enough for it, it just may have a different UX (more Twitter like) for mobile. I use Tusky on Android, but there's a lot of other clients available for Android and iOS.
For Instagram if you still need to use it, Barinsta on Android is a open source client for Insta without a lot of the advertising/algorithm shit being sent your way. I've been using it just to keep an eye on some organizers that use Insta over twitter.