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DuckDB — RDBMS (Open Source)

DuckDB is an open-source RDBMS solution from DuckDB Foundation. Compare it against 85 other RDBMS tools on FreeSoftwareX — by features, licensing and price — and request a quote or demo free in 2026.

What is DuckDB?

DuckDB is open source — its source code is publicly available and free to use, modify and self-host, usually with an active community and no licensing fees. It is categorised under RDBMS and published by DuckDB Foundation. Buyers typically evaluate DuckDB when they need a dependable RDBMS option and want to weigh the trade-offs between free, open-source and paid tools before committing.

DuckDB alternatives

If DuckDB isn't the right fit, compare these RDBMS alternatives side by side:

4th Dimension (4D)Actian VectorActian Zen (PSQL)Adabas DAltibaseAmazon AuroraApache DerbyApache IgniteCA DatacomCA IDMSCUBRIDClarionCockroachDBCrateDB

Frequently asked questions

Is DuckDB free?
Yes. DuckDB is open source and free to use, with no purchase cost for the core product.
What are the best DuckDB alternatives?
Popular RDBMS alternatives to DuckDB include 4th Dimension (4D), Actian Vector, Actian Zen (PSQL), Adabas D. See the full list of RDBMS on FreeSoftwareX.
What type of software is DuckDB?
DuckDB is an open-source RDBMS tool developed by DuckDB Foundation.

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