head to head · open source
Prometheus vs flipper
Prometheus has 66,906 GitHub stars, 10,969 forks, 890 open issues and last shipped yesterday. flipper has 3,973 stars, 447 forks, 33 open issues and last shipped yesterday. Prometheus leads on adoption by 1,584% (66,906 vs 3,973 stars). Prometheus is written in Go under Apache-2.0; flipper is written in Ruby under MIT. Prometheus has attracted 16% as many forks as stars, flipper 11%. Prometheus was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| Prometheus | flipper | |
|---|---|---|
| GitHub stars | ★ 67K | ★ 4.0K |
| License | Apache-2.0 | MIT |
| Written in | Go | Ruby |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 11K | ⑂ 447 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Prometheus if
- You weight community size — 67K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Go
- You value the larger contributor base for long-term maintenance
pick flipper if
- You want the flipper feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Ruby
- You evaluated both and flipper fits your workflow better
About Prometheus
Prometheus Visit prometheus.io for the full documentation, examples and guides. [ ][quay] [ ][hub] Prometheus, a Cloud Native Computing Foundation project, is a systems and service monitoring system. It collects metrics from configured targets at given intervals, evaluates rule expressions, displays the results, and can trigger alerts when specified conditions are observed. The features that distinguish Prometheus from other metrics and monitoring systems are: A multi dimensional data model (time series defined by metric name and set of key/value dimensions) PromQL, a powerful and flexible query language to…
read the full Prometheus overview →
About flipper
Website Documentation Examples Chat Twitter Ruby.social Flipper Beautiful, performant feature flags for Ruby and Rails. Flipper gives you control over who has access to features in your app. Enable or disable features for everyone, specific actors, groups of actors, a percentage of actors, or a percentage of time. Configure your feature flags from the console or a web UI. Regardless of what data store you are using, Flipper can performantly store your feature flags. Use Flipper Cloud to cascade features from multiple environments, share settings with your team, control permissions, keep an audit history, and…
read the full flipper overview →
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Frequently asked questions
Is Prometheus or flipper more popular?
Prometheus has 66,906 GitHub stars and flipper has 3,973. Prometheus has the larger community by that measure.
Are Prometheus and flipper free?
Both are open source. Prometheus is licensed under Apache-2.0 and flipper under MIT. Neither carries a licence fee.
What is the difference between Prometheus and flipper?
Prometheus is written in Go and flipper in Ruby. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, Prometheus or flipper?
Choose Prometheus if you want the larger community (66,906 stars) or its Apache-2.0 licence terms. Choose flipper if its feature set, stack or MIT licence fits better. Both are self-hostable.