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

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