Koel vs Polaris
A side-by-side comparison of two self-hosted media servers options — licensing, setup difficulty, resource needs, and what each one replaces.
Koel
Personal music streaming server with an elegant interface
VS
Polaris
Music streaming server focused on speed and simplicity
| Feature | Koel | Polaris |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 95 · Excellent | 75 · Good |
| Category | Media Servers | Media Servers |
| License | MIT | MIT |
| Language | PHP | Rust |
| Setup difficulty | Medium | Easy |
| Min. RAM | 512 MB | 128 MB |
| Deployment | docker, bare-metal | docker, binary, bare-metal |
| GitHub stars | ★ 17,262 | ★ 2,731 |
| First released | 2016 | 2017 |
| Replaces | Spotify | Spotify |
What are Koel and Polaris?
Koel
Koel is a personal music streaming server with a focus on a clean, modern web interface. It supports smart playlists, last.fm scrobbling, and streaming your own collection from any browser.
- Elegant web player
- Smart playlists
- Last.fm scrobbling
- Mobile companion app
Polaris
Polaris is a self-hosted music streaming application written in Rust, designed to be fast and easy to set up. It lets you browse and stream your music collection from a clean web interface or compatible clients.
- Written in Rust for speed
- Simple setup
- Last.fm integration
- Collection browsing
Koel vs Polaris: key differences
Koel is written in PHP, while Polaris is built with Rust. Polaris is the lighter option, starting around 128 MB of RAM against 512 MB for Koel. Koel has the considerably larger community, at 17,262 GitHub stars versus 2,731.
Why pick each one
Choose Koel if…
- Beautiful interface
- Active community
Watch out for
- Needs a separate database
- Limited transcoding options
Choose Polaris if…
- Low resource usage
- Single binary deployment
Watch out for
- Smaller ecosystem
- Fewer client options
Frequently asked questions
Is Koel or Polaris better?
Neither is universally better. Koel has the larger community, while Polaris is simpler to set up (easy difficulty). Choose based on the comparison table above and your own setup.
Are Koel and Polaris free and open-source?
Yes. Koel is licensed under MIT and Polaris under MIT. Both can be self-hosted at no software cost.
Can I run Koel and Polaris with Docker?
Koel: yes. Polaris: yes.
Which is lighter on resources, Koel or Polaris?
Polaris has the smaller minimum footprint at 128 MB of RAM, compared to about 512 MB for Koel. Real-world usage depends on library size, user count, and enabled features.