Thunder has experimental support for it. You'll also need a unifiedpush distributor installed. F-Droid has a good explainer on UnifiedPush at https://f-droid.org/2022/12/18/unifiedpush.html
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Does it support notifications from various communities? Or just comments replies?
Replies, mentions and messages, afaik. Not sure what other kind of notifications you'd be expecting.
I’m referring to notifications similar to those provided by Apollo for Reddit, such as receiving a notification whenever a post receives a certain number of upvotes.
Actually I take it all back, the support for push notifications isn't in Lemmy itself yet. It's not practically usable for you.
You will just have to wait until Lemmy officially supports push notifications. It is planned. Anything else is a hack involving polling.
Maybe not what you want, but my solution is email notifications with InstAddr
I've kind of been using that way more than disposable email at this point. The app notifications always work and get received immediately.
I am not sure how trustworthy it is though. I've been using it for years, even for school and work, which is probably not the wisest, but it's worked for me better than others.
Boost sends me notifications on replies
That's what I am using but I don't get the notification unless I open the app
Might be your settings or permissions
does Voyager work with ntfy?
There are no available options yet, except for comment and post reply notifications.
Which app does that?
I get them on sync
Shit most of the apps I've tried out don't even correctly tell you you have messages when you open them. Not one seems to poll for messages, replies, or mentions automatically every so often; they all require manually refreshing the message window and even then, sometimes you have to close the entire thing and reopen it (as with Jerboa).