head to head · open source
sequelize vs kysely
sequelize has 30,362 GitHub stars, 4,341 forks, 1,080 open issues and last shipped today. kysely has 14,235 stars, 444 forks, 173 open issues and last shipped yesterday. sequelize leads on adoption by 113% (30,362 vs 14,235 stars). sequelize is written in TypeScript under MIT; kysely is written in TypeScript under MIT. sequelize has attracted 14% as many forks as stars, kysely 3%. sequelize was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 5 topic tags (microsoft-sql-server, mssql, mysql, nodejs), 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 | kysely | |
|---|---|---|
| GitHub stars | ★ 30K | ★ 14K |
| License | MIT | MIT |
| Written in | TypeScript | TypeScript |
| Last push | 2026-09-18 | 2026-09-17 |
| Forks | ⑂ 4.3K | ⑂ 444 |
| 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 kysely if
- You want the kysely feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and kysely 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 kysely
Kysely is a type safe TypeScript SQL query builder for Node.js, Deno, Bun, and the browser. It provides a fluent API to construct and execute type safe SQL queries, preventing runtime errors from invalid column names or incorrect data types. The core problem it solves is eliminating the fragility of raw SQL strings and the lack of type safety in many ORMs within the TypeScript ecosystem.
read the full kysely overview →
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Frequently asked questions
Is sequelize or kysely more popular?
sequelize has 30,362 GitHub stars and kysely has 14,235. sequelize has the larger community by that measure.
Are sequelize and kysely free?
Both are open source. sequelize is licensed under MIT and kysely under MIT. Neither carries a licence fee.
What is the difference between sequelize and kysely?
sequelize is written in TypeScript and kysely in TypeScript. 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 kysely?
Choose sequelize if you want the larger community (30,362 stars) or its MIT licence terms. Choose kysely if its feature set, stack or MIT licence fits better. Both are self-hostable.