Gemfast review
A focused private gem server for teams that want self-hosted Ruby package control.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Gemfast is a self-hosted RubyGems server written in Go for teams that need private distribution of internally developed gems. It can host private packages, mirror and cache gems from rubygems.org, and serve both the legacy Dependency API and Compact Index API. Ruby teams looking for a focused internal gem service will find its scope clear, while organizations seeking one repository for several artifact ecosystems should look elsewhere.
Its platform fit centers on RubyGems, with Docker images and precompiled binaries available for distribution. Gemfast also provides local authentication and GitHub OAuth, role-based access configuration, regex-based gem allow/deny filtering, and CVE severity-based gem blocking. These controls make it more than a basic private package endpoint, particularly for teams that want to restrict packages or block gems by vulnerability severity. The experimental web UI adds viewing and searching, but the core workflow remains package hosting and API access.
The main trade-off is focus. Gemfast is built around Ruby packages, so its single-ecosystem scope limits its fit for teams managing broader artifact portfolios. Its self-hosted model and HCL configuration give teams control over deployment, but also make Gemfast a better match for organizations prepared to operate their own service. Choose it when private RubyGems hosting, upstream mirroring, authentication, access roles, filtering, and CVE blocking are the priority. Choose an alternative when you need a broader repository platform or a more mature web interface.
Gemfast pros and cons
- Where it wins
- Hosts private gems and mirrors or caches gems from rubygems.org
- Adds role-based access, OAuth, filtering, and CVE-based blocking
- Supports Docker images, precompiled binaries, and two RubyGems APIs
- Where it doesn't
- Focused on RubyGems rather than a broad multi-ecosystem repository
- Web interface is experimental for viewing and searching gems
- Requires a self-hosted deployment configured through an HCL file
Gemfast fact sheet, pricing and score →
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