We are thrilled to announce the official release of ActivityPods 2.0, a framework and platform that allows users to create a single account for multiple decentralised social applications while also providing developers with the tools to build and integrate these applications.
That’s not true it’s compatible with anything running ActivityPub. It currently has build a Mastodon client as a demo that’s why right now you can use it with Mastodon. They built Mastopod in a week. Part of the pitch it showing devs how relatively simple it is to build apps on top of it. So if someone builds a Pixelfed, Lemmy etc app then you absolutely can use it
What if I just use the webpage?
Have you ever tried Mbin? https://fedia.io/
It has both Lemmy and Mastodon on the same website, and all notifications arrive in the same inbox