A (probably comprehensive) list of differences Big ones fully federated note editing, you can also see previous versions of edited notes, and everyone who interacted with a note will receive your edits Mastodon-compatible API, including OAuth2 can import your exported posts from Mastodon and most of its forks, Pleroma / Akkoma, Misskey / Firefish and forks, Twitter, Instagram, Facebook, including attachments (threading may not work perfectly, and other people’s replies to your posts may not get imported) admins can require approval for new users’ signups admins can silence users admins can mark all of a user’s media, or a whole remote instance, as NSFW GDPR-style Data Subject Access Requests (users can export all data related to themselves) “bubble” timeline, showing all known notes from an admin-configured list of remote instances you can specify the visibility of each boost / renote thread view updates in real time check signature on ActivityPub GET requests, also known as “secure mode” or “authorized fetch” (experimental) Fun ones can play module / tracker music files (federated) listenbrainz integration (federated) background image on user profiles “speak as cat” separate from “is a cat” (both setting are federated with compatible software) themes can specify a font, so you can use whatever font is most legible for you you can change the way note threads are show to be more like Firefish (with lines connecting notes and their replies, and focusing notes on timelines) MFM renders mathematical formulas and bidirectional text MFM implements $[crop], $[fade], and $[followmouse] you can select tossface emoji oneko, the cute cat that follows your mouse pointer when you have unread notifications, the browser icon can show a dot you can create an antenna showing “all users from these instances” instead of having to list each remote user UI/UX option to open a note’s detailed view by clicking on the note (most useful on mobile) images lacking alt text are marked as such UI elements can be round (as in Misskey) or square-ish “sign out” button in user menu user profile page has “notes” / “all” / “including files” tabs attachments can be collapsed by default download buttons for audio and video attachments buttons to show/hide all notes with CWs in a conversation you can choose to always show long notes in their entirety you can choose to always expand notes that have a CW one-button “like” (plus custom reactions on a separate button) animated MFM can be enabled/disabled on each note italic, bold, hashtags accept more characters (so #æîç is a valid hashtag) supports longer alt text pop-up user profiles show if follow requests to the user require approval, have an “open remote profile” option, and show custom fields (e.