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Sharkey vs Tumblr: catalog facts
Sharkey	Tumblr
Free Free to self-host.	Free Free to join and post.
Web, Self-hosted	Web
Tracks upstream Misskey while adding features Federates with Mastodon, Akkoma, Pixelfed and more	Reblogging makes sharing and discovery easy Mix of text, image and video posts
Hosting an instance requires server administration Smaller project with a small maintainer team	Centralised, proprietary platform owned by a single company
Self-hosted	Web application
Open source	Closed source
License not stated	License not stated
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 23, 2026	Official website Full listing and sources Checked October 2, 2026

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