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Smithereen vs Misskey: catalog facts
Smithereen	Misskey
Free Free and released into the public domain under the Unlicense.	Free Free and open source under the AGPL. Hosting is separate.
Self-hosted	Web, Self-hosted
Friends, walls and groups instead of a microblog feed Federates with other ActivityPub servers	Custom reactions, quotes and a built-in file drive that Mastodon lacks Deep per-instance theming and customisation
You need to run and maintain your own server Smaller community than Mastodon or other major fediverse servers	Heavier to run than other fediverse servers Most documentation and community support is in Japanese
Self-hosted	Self-hosted, Web application
Open source	Open source
License: Unlicense	License: AGPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.