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Technical Details

kosmos.social is currently hosted on a dedicated server at Hetzner in Germany (renewable energy source, German laws apply). We configure and deploy everything via Chef cookbooks. Your uploads are stored on Amazon S3. Automated backups are run regularly and pushed to S3 as well.

Our fork of the source code is publicly available at https://gitea.kosmos.org/kosmos/mastodon/ (we deploy the production branch). We frequently update the repo and running code with the latest fixes and improvements.

TL;DR We know what we are doing and your data should be safe. However, since this is a free service, we do not guarantee it.

Chat rooms

If you're using IRC, you can find us in #kosmos on Libera.Chat. XMPP users are invited to join kosmos@kosmos.chat. If there's no immediate response to a question, just idle for a while.


You can access this instance from within the Tor network at the following address:


Please note that there will be a security warning about the TLS certificate being valid for the "wrong" domain. It is using the "kosmos.social" certificate, so you can verify that it's the correct site and grant an exception for this mismatch. A small orange warning icon will persist in your address bar, even though the connection is actually quite secure.

The Rules

The following guidelines are not a legal document, and final interpretation is up to the administration of kosmos.social; they are here to provide you with an insight into our content moderation policies:

  1. The following types of content will be removed from the public timeline:
    1. Excessive advertising
    2. Uncurated news bots posting from third-party news sources
    3. Untagged pornography and sexually explicit content
    4. Untagged gore and extremely graphic violence
  2. The following types of content will be removed from the public timeline, and may result in account suspension and revocation of access to the service:
    1. Racism or advocation of racism
    2. Sexism or advocation of sexism
    3. Discrimination against gender and sexual minorities, or advocation thereof
    4. Xenophobic and/or violent nationalism
  3. The following types of content are explicitly disallowed and will result in revocation of access to the service:
    1. Sexual depictions of children
    2. Content illegal in Germany and/or France, such as holocaust denial or Nazi symbolism
    3. Conduct promoting the ideology of National Socialism
  4. Any conduct intended to stalk or harass other users, or to impede other users from utilizing the service, or to degrade the performance of the service, or to harass other users, or to incite other users to perform any of the aforementioned actions, is also disallowed, and subject to punishment up to and including revocation of access to the service. This includes, but is not limited to, the following behaviors:
    1. Continuing to engage in conversation with a user that has specifically has requested for said engagement with that user to cease and desist may be considered harassment, regardless of platform-specific privacy tools employed.
    2. Aggregating, posting, and/or disseminating a person's demographic, personal, or private data without express permission (informally called doxing or dropping dox) may be considered harassment.
    3. Inciting users to engage another user in continued interaction or discussion after a user has requested for said engagement with that user to cease and desist (informally called brigading or dogpiling) may be considered harassment.

These provisions notwithstanding, the administration of the service reserves the right to revoke any user's access permissions, at any time, for any reason, except as limited by law.