PixelFed :pixelfed: is an Instagram-style photo sharing platform on the Fediverse.
Find out more including servers to join at their new website:
You can follow PixelFed accounts from Mastodon and vice versa. For example, click on @Picturavis
There's an official iPhone app in public beta at:
:apple_inc: https://testflight.apple.com/join/5HpHJD5l
There's a third party Android app at:
:android: https://pixeldroid.org
Mastodon apps will also work with PixelFed accounts.