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Tad vs Harlequin: catalog facts
Tad	Harlequin
Free Free and open source under the MIT licence.	Free Free and open source, supported through GitHub Sponsors.
Windows, macOS, Linux	Windows, macOS, Linux, Command line
Opens CSV, Parquet, SQLite and DuckDB data in one app Pivot table view for exploring data without code	Full SQL IDE inside the terminal, usable over SSH Adapters for DuckDB, SQLite, Postgres and more
Hobby project with known bugs and rough edges Releases are infrequent; the latest is from June 2024	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
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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