DuckDB

Features

DuckDB uses a vectorized query processing engine. DuckDB is special amongst database management systems because it does not have any external dependencies and can be built with just a C++17 compiler. DuckDB also deviates from the traditional client–server model by running inside a host process (it has bindings, for example, for a Python interpreter with the ability to directly place data into NumPy arrays). DuckDB's SQL parser is derived from the pg_query library developed by Lukas Fittl, which is itself derived from a stripped-down version of PostgreSQL's SQL parser. DuckDB uses a single-file storage format to store data on disk, designed to support efficient scans, bulk updates, appends, and deletes. DuckDB is also compiled to WebAssembly using emscripten which enables DuckDB to run SQL in browser-based analytics tools.

Comparison

DuckDB in its OLAP niche does not compete with the traditional DBMS like MSSQL, PostgreSQL and Oracle database. While using SQL for queries, DuckDB targets serverless applications and provides extremely fast responses using either Apache Parquet files or its own format for storage. These attributes make it a popular choice for large dataset analysis in interactive mode.

Commercial use

DuckDB is used at Facebook, Google, and Airbnb.

DuckDB co-author Mühleisen also runs a support and consultancy firm for the software, DuckLabs. The company has chosen not to take venture capital funding, stating "We feel investment would force the project direction towards monetization, and we would much prefer keeping DuckDB open and available for as many people as possible". Another company, MotherDuck, has received $100 million funding for its data platform based on DuckDB, with investors including Andreessen Horowitz.

The company DuckLabs was formerly known as DuckDB Labs. In August 2026, DuckLabs was acquired by Amazon; its employees will join the Amazon Web Services subsidiary.

DuckDB Foundation

The independent non-profit DuckDB Foundation safeguards the long-term maintenance and development of DuckDB. The foundation holds much of the intellectual property of the project and is funded by charitable donations. The DuckDB Foundation's statutes ensure DuckDB remains open-source under the MIT license in perpetuity.

Language support

In addition to the native C and C++ APIs, DuckDB supports a range of programming languages.

Extensions

DuckDB's architecture supports extensions, allowing additional functionality to be added dynamically. Many popular extensions are maintained by the core DuckDB team, and there are over 30 community extensions maintained by third parties.

DuckDB's architecture supports dynamically loaded extensions. Core extensions maintained by the DuckDB team include:

• httpfs — remote file access via HTTP, HTTPS, and S3-compatible object storage (including Azure write support since v1.5)
• spatial — geospatial functions (ST_* family); GEOMETRY became a built-in core type in v1.5
• iceberg — Apache Iceberg table read/write, including REST catalog support
• delta — Delta Lake table read/write via the Delta Kernel
• ducklake — lakehouse format storing all metadata in a SQL database with ACID semantics; supports time travel, schema evolution, and multi-table transactions

There are also over 30 community extensions maintained by third parties, covering use cases from graph queries (SQL/PGQ) to Kafka integration and ML inference. A full list is available at the DuckDB Community Extensions registry.