The best alternative to Tumblr is Mastodon, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Tumblr and six of them are so hopefully you can find a suitable replacement. Other interesting alternatives to Tumblr are Movim, monocles social, OverBlog and Mozello.
Decentralized and federated social platform with no ads, focusing on personal interaction, and offering 500 character posts, custom emojis, content warnings, and robust moderation tools.
Decentralized social and blog platform based on XMPP, enabling self-hosting, cross-network chat, video calls, and group collaboration. Users control and migrate their data, communicate across various networks, and access services from any node while preserving privacy and open-source principles.
OverBlog is a blogging platform, active and evolving. Create a blog, without any technical knowledge, and find everything you post ! Create your blog has never been easier.
User-friendly platform for creating mobile-friendly sites, blogs, and stores quickly. Features include SEO tools, multilingual support, and complete hosting management with no tech skills needed.
ZeroBlog - For a distributed, self publishing blogging platform ( and centralized authentication ).
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It's a Twitter alternative.