Puma
The facts below are what the maker publishes about Puma, checked and dated. Our editors have not written about it yet.
Plans and prices
From Puma's own pricing page, checked 7 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Puma | Free | Open-source Ruby/Rack web server · BSD 3-Clause license |
The facts
Each one read from Puma's own pages, with the date it was checked.
What it does
- Concurrency
- Puma serves requests in separate threads and can use pre-forked worker processes in cluster mode.checked 7 Oct 2026
- Deployment
- The deployment guide says Puma can be used as a development server, though most users run it in production deployments.checked 7 Oct 2026
- Frameworks
- Puma is the default server for Ruby on Rails and can also run Sinatra applications.checked 7 Oct 2026
- Integrations
- The documentation lists community plugins for exporting metrics to Prometheus and sending metrics to StatsD.checked 7 Oct 2026
- License
- Puma is licensed under the BSD 3-Clause license.checked 7 Oct 2026
- Monitoring
- Puma includes a built-in status and control app, and its docs describe using process monitors such as systemd or rc.d.checked 7 Oct 2026
- Product
- Puma is a fast, concurrent HTTP 1.1 server designed for Ruby/Rack applications.checked 7 Oct 2026
- Ruby implementations
- Puma works with MRI Ruby and JRuby, and the documentation also names TruffleRuby as a truly parallel Ruby implementation.checked 7 Oct 2026
- Security support
- The security policy supports the latest release in the 8.x and 7.x series and marks all other releases unsupported.checked 7 Oct 2026
- SSL requirement
- Puma supports SSL sockets when OpenSSL development files are installed; without them, it installs but does not allow SSL connections.checked 7 Oct 2026
- Standalone
- Puma supports SSL, zero-downtime rolling restarts, and a built-in request bufferer, allowing deployment without a reverse proxy.checked 7 Oct 2026
- Vulnerability reporting
- The security policy directs vulnerability reports to GitHub or Evan Phoenix.checked 7 Oct 2026
The company
- Founded
- 2011checked 28 Sep 2026
Where it runs
- Windows limitation
- Cluster mode is not supported on Windows because it lacks fork(2).checked 7 Oct 2026
Alternatives to Puma
- 1
Oracle WebCenter Content
AndroidiOSWebAPI7.7$3,450 one-time - 2
Mongoose Web Server
Free planAndroidiOSWebAPI6.9Free plan - 3
Phusion Passenger
Free planLinuxmacOSSelf-hosted6.8From $23.52 a year - 4
Abyss Web Server
Free planLinuxmacOSSelf-hostedWindows6.7$59.95 one-time - 5
Caddy
AndroidWebAPILinux6.7From $25 a month - 6
CivetWeb
Free planAndroidiOSAPILinux6.7Free plan