head to head · open source
Prometheus vs WatermelonDB
Prometheus has 66,906 GitHub stars, 10,969 forks, 890 open issues and last shipped yesterday. WatermelonDB has 11,797 stars, 663 forks, 304 open issues and last shipped 2 months ago. Prometheus leads on adoption by 467% (66,906 vs 11,797 stars). Prometheus is written in Go under Apache-2.0; WatermelonDB is written in JavaScript under MIT. Prometheus has attracted 16% as many forks as stars, WatermelonDB 6%. Prometheus was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (hacktoberfest), so they are genuine substitutes rather than adjacent tools.
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 | WatermelonDB | |
|---|---|---|
| GitHub stars | ★ 67K | ★ 12K |
| License | Apache-2.0 | MIT |
| Written in | Go | JavaScript |
| Last push | 2026-11-02 | 2026-09-16 |
| Forks | ⑂ 11K | ⑂ 663 |
| 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 WatermelonDB if
- You want the WatermelonDB feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches JavaScript
- You evaluated both and WatermelonDB 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 WatermelonDB
A reactive database framework Build powerful React and React Native apps that scale from hundreds to tens of thousands of records and remain fast ⚡️ Why Watermelon? WatermelonDB is a new way of dealing with user data in React Native and React web apps. It's optimized for building complex applications in React Native, and the number one goal is real world performance . In simple words, your app must launch fast . For simple apps, using Redux or MobX with a persistence adapter is the easiest way to go. But when you start scaling to thousands or tens of thousands of database records, your app will now be slow to…
read the full WatermelonDB overview →
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Frequently asked questions
Is Prometheus or WatermelonDB more popular?
Prometheus has 66,906 GitHub stars and WatermelonDB has 11,797. Prometheus has the larger community by that measure.
Are Prometheus and WatermelonDB free?
Both are open source. Prometheus is licensed under Apache-2.0 and WatermelonDB under MIT. Neither carries a licence fee.
What is the difference between Prometheus and WatermelonDB?
Prometheus is written in Go and WatermelonDB in JavaScript. 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 WatermelonDB?
Choose Prometheus if you want the larger community (66,906 stars) or its Apache-2.0 licence terms. Choose WatermelonDB if its feature set, stack or MIT licence fits better. Both are self-hostable.