Mastodon is described as 'Federated and open-source social network with no ads, 500-character limit, custom emojis, and content warnings, emphasizing privacy and personal interaction' and is a leading Social Network in the social & communications category. There are more than 100 alternatives to Mastodon for a variety of platforms, including Web-based, Android, iPhone, Self-Hosted and iPad apps. The best Mastodon alternative is diaspora*, which is both free and Open Source. Other great apps like Mastodon are Pleroma, Pixelfed, Bluesky and X.
Mastodon alternatives are mainly Social Networks, but if you're looking for
Microblogs or Photo Sharing Apps you can filter on that. Other popular filters include
Open Source. These are just examples - use the filter bar below to find more specific alternatives to Mastodon.