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DuckDB vs trdsql: catalog facts
DuckDB	trdsql
Free Free and open source under the MIT licence.	Free The open-source application is available without a license fee.
Windows, macOS, Linux, Command line	Windows, macOS, Linux
Queries CSV and Parquet files directly with no loading step Embeds into Python, R and the shell with a single dependency	SQL queries over several structured file formats
Single-process by design; it is not a shared multi-user database Concurrent writers are not supported	Available SQL behavior depends on the selected database backend.
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.