Lemmy: Presently using one account (this one). Have another as backup. Access on android using mostly Eternity and now since the latest update, Voyager because I’m loving scaled sort. Access on Windows PC using Voyager, alexandrite and lemmy ui in browser if I need to access account settings.
Mastodon: one account only, semi-anonymous. Access on android using Moshidon and on PC using Elk. Use the Mastodon ui only if I need to access account settings. I mostly use Mastodon for posting whatever I find interesting and occasionally browse by hashtags as per my mood.
Bookwyrm: one account, no app. Trying to make this a goodreads alternative for myself.