head to head · open source
duckdb vs ktx
duckdb has 41,563 GitHub stars, 3,808 forks, 858 open issues and last shipped yesterday. ktx has 1,598 stars, 105 forks, 52 open issues and last shipped 9 days ago. duckdb leads on adoption by 2,501% (41,563 vs 1,598 stars). duckdb is written in C++ under MIT; ktx is written in TypeScript under Apache-2.0. duckdb has attracted 9% as many forks as stars, ktx 7%. duckdb was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (analytics), 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
| duckdb | ktx | |
|---|---|---|
| GitHub stars | ★ 42K | ★ 1.6K |
| License | MIT | Apache-2.0 |
| Written in | C++ | TypeScript |
| Last push | 2026-09-19 | 2026-09-11 |
| Forks | ⑂ 3.8K | ⑂ 105 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick duckdb if
- You weight community size — 42K stars and counting
- You want the MIT license terms
- Your stack matches C++
- You value the larger contributor base for long-term maintenance
pick ktx if
- You want the ktx feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and ktx fits your workflow better
About duckdb
DuckDB is an analytical, in process SQL database management system written in C++ and released under the MIT license. It runs inside the application process rather than as a separate server, and it is distributed as a standalone command line application as well as through clients for Python, R, Java, and WebAssembly. The project lives in the analytical SQL ecosystem, where the topics listed for it are analytics, database, embedded database, OLAP, and SQL. It has been developed for about eight years, with the last push recorded on 15 September 2026.
read the full duckdb overview →
About ktx
ktx is an open source, Apache 2.0 licensed executable context layer, built and maintained by Kaelio in TypeScript, that lets AI agents such as Claude Code, Codex, Cursor, and OpenCode query analytical warehouses accurately using approved metric definitions, detected joinable columns, and company knowledge.
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Frequently asked questions
Is duckdb or ktx more popular?
duckdb has 41,563 GitHub stars and ktx has 1,598. duckdb has the larger community by that measure.
Are duckdb and ktx free?
Both are open source. duckdb is licensed under MIT and ktx under Apache-2.0. Neither carries a licence fee.
What is the difference between duckdb and ktx?
duckdb is written in C++ and ktx 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, duckdb or ktx?
Choose duckdb if you want the larger community (41,563 stars) or its MIT licence terms. Choose ktx if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.