What is Cosmos Server used for?

Cosmos Server is a self-hosted home server platform that acts as a secure gateway and manager for the apps running on your server, NAS or Raspberry Pi. It is a good fit for securing home-lab services behind one login, managing apps on a NAS or Raspberry Pi and replacing a hand-built reverse proxy setup.

Is Cosmos Server open source?

Yes. Cosmos Server is open source under a custom licence. Its source code is on GitHub at azukaar/Cosmos-Server and is written mainly in Go.

Is Cosmos Server free?

Yes. Cosmos Server is open source, so the software itself is free to use under the terms of its own licence. Paid plans are also available, starting at $16 per month.

Can I self-host Cosmos Server?

Yes. Cosmos Server can be self-hosted on your own server or infrastructure; there is no official hosted version.

What are some alternatives to Cosmos Server?

Similar open-source tools in the Infrastructure & Containers category include CasaOS, Umbrel and Uncloud. SaaS products in the same category include Amazon ECR, Azure Container Registry and Docker Desktop.

Is Cosmos Server actively maintained?

Yes. The most recent commit to Cosmos Server was on 19 September 2026, and the latest release is v0.23.4, published on 30 August 2026. The project has 6.2k stars on GitHub.

Cosmos Server: open-source infrastructure & containers

About Cosmos Server

Cosmos Server is a self-hosted platform that sits in front of the applications you run at home, such as media servers, home automation or a blog, and acts as a secure gateway. It also works as a server manager, so you can install and look after services from one interface rather than exposing each of them directly to the internet.

The project focuses on the security of self-hosted setups, with a reverse proxy, authentication and single sign-on, plus anti-DDoS and anti-bot protections listed in its description. It includes an app store with simple installers, automatic updates and security checks, and it works alongside apps you install manually. Typical targets are a server, a NAS or a Raspberry Pi running tools such as Plex or Home Assistant.

Cosmos is written in Go and published under a license that GitHub lists as 'Other', so check the repository for exact terms. It is intended to be run on your own hardware. It suits home-lab users who want secure remote access and centralized login for their services without assembling several separate tools.

Key features

Reverse proxy gateway for self-hosted apps
Built-in authentication and single sign-on
Anti-DDoS and anti-bot protection
App store with simple installers
Automatic updates and security checks
Server and container management interface

Good fit for

→Securing home-lab services behind one login
→Managing apps on a NAS or Raspberry Pi
→Replacing a hand-built reverse proxy setup

Built with: Go
Tags: self-hosted; reverse-proxy; home-server; sso; security; docker; golang

Cosmos Server: questions and answers

What is Cosmos Server used for?: Cosmos Server is a self-hosted home server platform that acts as a secure gateway and manager for the apps running on your server, NAS or Raspberry Pi. It is a good fit for securing home-lab services behind one login, managing apps on a NAS or Raspberry Pi and replacing a hand-built reverse proxy setup.
Is Cosmos Server open source?: Yes. Cosmos Server is open source under a custom licence. Its source code is on GitHub at azukaar/Cosmos-Server and is written mainly in Go.
Is Cosmos Server free?: Yes. Cosmos Server is open source, so the software itself is free to use under the terms of its own licence. Paid plans are also available, starting at $16 per month.
Can I self-host Cosmos Server?: Yes. Cosmos Server can be self-hosted on your own server or infrastructure; there is no official hosted version.
What are some alternatives to Cosmos Server?: Similar open-source tools in the Infrastructure & Containers category include CasaOS, Umbrel and Uncloud. SaaS products in the same category include Amazon ECR, Azure Container Registry and Docker Desktop.
Is Cosmos Server actively maintained?: Yes. The most recent commit to Cosmos Server was on 19 September 2026, and the latest release is v0.23.4, published on 30 August 2026. The project has 6.2k stars on GitHub.