cohost is described as 'A new social media platform built from the ground up by a small team of developers and designers who like sharing things on the internet' and is a Social Network in the social & communications category. There are more than 10 alternatives to cohost, not only websites but also apps for a variety of platforms, including Self-Hosted, Android, iPhone and iPad apps. The best cohost alternative is Mastodon, which is both free and Open Source. Other great sites and apps similar to cohost are Pixelfed, diaspora*, X and Tumblr.
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.
Pixelfed is an image sharing platform with focus on Privacy, Safety and Security, an ethical alternative to centralized platforms like Instagram.
Experience global interaction with public conversations, real-time news updates, live audio Spaces, streaming video, exclusive content monetization, and niche Communities.
Tumblr is a place to express yourself, discover yourself, and bond over the stuff you love. It's where your interests connect you with your people.
An open-source platform for decentralized social networking. Users can monetize posts through ads or monthly support, engaging in various features such as Blogs, Videos, and secure private chats. Minds supports free speech and facilitates sharing across networks and exploring global trends.
Friendica is a distributed social network application. Which allow users to connect with others via their own Friendica server, but may also fully integrate contacts from other platforms including Twitter, diaspora*, Pump.io and StatusNet into their 'newsfeed'.
Pleroma is a free, federated social networking server built on open protocols. It is compatible with GNU Social, Mastodon, and many other ActivityPub and OStatus implementations.
Gab Social is an open source and fully decentralized social network powered by the Gab Platform. It is the new social network of Gab.com. This change was made to further Gab's commitment to its users trust and privacy online.
GNU social is a continuation of the StatusNet project. It is social communication software for both public and private communications. It is widely supported and has a large userbase.
This is a fork of Pleroma, which is a microblogging server software that can federate (= exchange messages with) other servers that support ActivityPub. What that means is that you can host a server for yourself or your friends and stay in control of your online identity, but...
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I don't think this is a Twitter alternative, but rather a Tumblr alternative.