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Monstodon is an implementation of MonStrPub on top of Mastodon. It is a free, open-source social network server based on open web protocols like ActivityPub—only with support for cute monsters as well :3

Ruby on Rails is used for the back-end, while React.js and Redux are used for the dynamic front-end. A static front-end for public resources (profiles and statuses) is also provided.

If you would like, you can support the development of this project on Patreon or Liberapay.

Monstodon is a very new project, currently under active development and not yet ready for deployment on production servers. Hang in there!

The master branch will (soon) contain the latest stable version of the Monstodon code (currently Monstodon isn't really stable just yet). The devon branch is where you can find the most up-to-date in-development Monstodon code.

Monstodon Resources

Mastodon Resources

Monstodon Features

Support for cute, federated mon :3

Who doesn't want a cute mon or several on your ActivityPub profile???

Mastodon Features

No vendor lock-in: Fully interoperable with any conforming platform

It doesn't have to be Mastodon, whatever implements ActivityPub or OStatus is part of the social network!

Real-time timeline updates

See the updates of people you're following appear in real-time in the UI via WebSockets. There's a firehose view as well!

Federated thread resolving

If someone you follow replies to a user unknown to the server, the server fetches the full thread so you can view it without leaving the UI

Media attachments like images and short videos

Upload and view images and WebM/MP4 videos attached to the updates. Videos with no audio track are treated like GIFs; normal videos are looped - like vines!

OAuth2 and a straightforward REST API

Mastodon acts as an OAuth2 provider so 3rd party apps can use the API

Fast response times

Mastodon tries to be as fast and responsive as possible, so all long-running tasks are delegated to background processing

Deployable via Docker

You don't need to mess with dependencies and configuration if you want to try Mastodon, if you have Docker and Docker Compose the deployment is extremely easy


Please follow the development guide from the documentation repository.

If you are using Vagrant, note that the development URL has been changed to monstodon.test. The admin account is admin@monstodon.test and has the usual password of mastodonadmin.


There are guides in the documentation repository for deploying on various platforms.


You can open issues for bugs you've found or features you think are missing. You can also submit pull requests to this repository. Here are the guidelines for code contributions

IRC channel: #mastodon on


Forked from Mastodon, copyright (C) 2016-2018 Eugen Rochko & other Mastodon contributors (see

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License along with this program. If not, see

Extra credits

The elephant friend illustrations are created by Dopatwo


A MonStrPub implementation via Mastodon




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