head to head · open source
sequelize vs FreeSql
sequelize has 30,360 GitHub stars, 4,343 forks, 1,080 open issues and last shipped today. FreeSql has 4,403 stars, 910 forks, 178 open issues and last shipped 2 months ago. sequelize leads on adoption by 590% (30,360 vs 4,403 stars). sequelize is written in TypeScript under MIT; FreeSql is written in C# under MIT. sequelize has attracted 14% as many forks as stars, FreeSql 21%. sequelize was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (mysql), 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
| sequelize | FreeSql | |
|---|---|---|
| GitHub stars | ★ 30K | ★ 4.4K |
| License | MIT | MIT |
| Written in | TypeScript | C# |
| Last push | 2026-09-20 | 2026-07-31 |
| Forks | ⑂ 4.3K | ⑂ 910 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick sequelize if
- You weight community size — 30K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- 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 sequelize
Sequelize is a promise based object relational mapping tool for Node.js, written in TypeScript and distributed under the MIT license. It maps JavaScript and TypeScript objects onto relational tables, so application code works with models and relations instead of hand written SQL strings. The package is published on npm as @sequelize/core , documentation lives at sequelize.org, and the project has existed for roughly sixteen years with about 30,000 stars and 4,300 forks on GitHub. It belongs to the Node.js ecosystem, where it occupies the ORM layer between an application and its database driver.…
read the full sequelize 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 sequelize or FreeSql more popular?
sequelize has 30,360 GitHub stars and FreeSql has 4,403. sequelize has the larger community by that measure.
Are sequelize and FreeSql free?
Both are open source. sequelize is licensed under MIT and FreeSql under MIT. Neither carries a licence fee.
What is the difference between sequelize and FreeSql?
sequelize is written in TypeScript 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, sequelize or FreeSql?
Choose sequelize if you want the larger community (30,360 stars) or its MIT licence terms. Choose FreeSql if its feature set, stack or MIT licence fits better. Both are self-hostable.