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trdsql vs Harlequin: catalog facts
trdsql	Harlequin
Free The open-source application is available without a license fee.	Free Free and open source, supported through GitHub Sponsors.
Windows, macOS, Linux	Windows, macOS, Linux, Command line
SQL queries over several structured file formats	Full SQL IDE inside the terminal, usable over SSH Adapters for DuckDB, SQLite, Postgres and more
Available SQL behavior depends on the selected database backend.	Installed through Python, and newer Python versions may not be supported by all dependencies Terminal interface rather than a graphical client
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 23, 2026

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