I think it depends on what client you use. I haven’t seen it in any Lemmy app but you can find Lemmy users with a Mastodon client and add a note, so I guess it’s up to the various clients to implement.
Spectroid: what’s that sound? Do I hear that faint but annoying sound or just imagine it? With spectroid you can see the sound spectrum over time.
Nova launcher: Lets you cutomize the home screen of your phone and make it just right. I like my apps a bit closer together in five columns instead of four. Nova launcher let’s me do this.
Business calendar: it’s just so much better than the default calendar, especially if you have lots of meetings and need an information dense view.