head to head · open source
Prometheus vs efcore
Prometheus has 66,109 GitHub stars, 10,839 forks, 890 open issues and last shipped yesterday. efcore has 14,790 stars, 3,418 forks, 2,343 open issues and last shipped today. Prometheus leads on adoption by 347% (66,109 vs 14,790 stars). Prometheus is written in Go under Apache-2.0; efcore is written in C# under MIT. Prometheus has attracted 16% as many forks as stars, efcore 23%. efcore 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 | efcore | |
|---|---|---|
| GitHub stars | ★ 66K | ★ 15K |
| License | Apache-2.0 | MIT |
| Written in | Go | C# |
| Last push | 2026-09-17 | 2026-09-18 |
| Forks | ⑂ 11K | ⑂ 3.4K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Prometheus if
- You weight community size — 66K 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 efcore if
- You want the efcore feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches C#
- You evaluated both and efcore fits your workflow better
About Prometheus
Prometheus is an open source monitoring system and time series database, part of the Cloud Native Computing Foundation ecosystem. It collects metrics from configured targets at defined intervals, evaluates alerting rules, and visualizes results. Designed for reliability in dynamic environments, it operates without reliance on distributed storage, ensuring each server node functions independently.
read the full Prometheus overview →
About efcore
EF Core is a modern object database mapper for .NET, maintained by Microsoft under the MIT License as a .NET Foundation project, and it is intended for .NET developers who want to work with relational and non relational databases through LINQ queries, change tracking, updates, and schema migrations instead of hand written data access code.
read the full efcore overview →
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Frequently asked questions
Is Prometheus or efcore more popular?
Prometheus has 66,109 GitHub stars and efcore has 14,790. Prometheus has the larger community by that measure.
Are Prometheus and efcore free?
Both are open source. Prometheus is licensed under Apache-2.0 and efcore under MIT. Neither carries a licence fee.
What is the difference between Prometheus and efcore?
Prometheus is written in Go and efcore in C#. 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 efcore?
Choose Prometheus if you want the larger community (66,109 stars) or its Apache-2.0 licence terms. Choose efcore if its feature set, stack or MIT licence fits better. Both are self-hostable.