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Mastodon vs Tumblr: catalog facts
Mastodon	Tumblr
Free Free and open source under the AGPL. Hosting is separate.	Free Free to join and post.
Android, Web, Self-hosted	Web
Chronological timelines with no engagement ranking Federated, so moving servers does not mean losing your network	Reblogging makes sharing and discovery easy Mix of text, image and video posts
Your experience depends heavily on which server you join Running a server has real moderation and maintenance cost	Centralised, proprietary platform owned by a single company
Self-hosted, Web application	Web application
Open source	Closed source
License: AGPL-3.0	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 22, 2026	Official website Full listing and sources Checked October 2, 2026

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