head to head · open source
Prometheus vs FreeSql
Prometheus has 66,109 GitHub stars, 10,839 forks, 890 open issues and last shipped 2 days ago. FreeSql has 4,404 stars, 910 forks, 178 open issues and last shipped 2 months ago. Prometheus leads on adoption by 1,401% (66,109 vs 4,404 stars). Prometheus is written in Go under Apache-2.0; FreeSql is written in C# under MIT. Prometheus has attracted 16% as many forks as stars, FreeSql 21%. 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 | FreeSql | |
|---|---|---|
| GitHub stars | ★ 66K | ★ 4.4K |
| License | Apache-2.0 | MIT |
| Written in | Go | C# |
| Last push | 2026-09-17 | 2026-07-31 |
| Forks | ⑂ 11K | ⑂ 910 |
| 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 FreeSql if
- You want the FreeSql feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches C#
- You evaluated both and FreeSql 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 FreeSql
FreeSql is an MIT licensed object relational mapper for .NET, written in C and usable from C and VB.NET, which its maintainers describe as the first AOT ORM, and it is aimed at .NET teams that want a single data access layer across many relational and analytical databases, including MySQL, PostgreSQL, SQL Server, Oracle, SQLite, Firebird, ClickHouse, DuckDB, TDengine, QuestDB, MsAccess and a group of Chinese domestic engines.
read the full FreeSql overview →
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Frequently asked questions
Is Prometheus or FreeSql more popular?
Prometheus has 66,109 GitHub stars and FreeSql has 4,404. Prometheus has the larger community by that measure.
Are Prometheus and FreeSql free?
Both are open source. Prometheus is licensed under Apache-2.0 and FreeSql under MIT. Neither carries a licence fee.
What is the difference between Prometheus and FreeSql?
Prometheus is written in Go and FreeSql 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 FreeSql?
Choose Prometheus if you want the larger community (66,109 stars) or its Apache-2.0 licence terms. Choose FreeSql if its feature set, stack or MIT licence fits better. Both are self-hostable.