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VisiData vs Tad: catalog facts
VisiData	Tad
Free Free and open source under GPL-3.0, supported by donations.	Free Free and open source under the MIT licence.
macOS, Linux, Command line	Windows, macOS, Linux
Opens dozens of data formats, including Excel and SQLite Handles millions of rows quickly	Opens CSV, Parquet, SQLite and DuckDB data in one app Pivot table view for exploring data without code
Keyboard-driven interface with many commands to learn Some formats need extra Python packages	Hobby project with known bugs and rough edges Releases are infrequent; the latest is from June 2024
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 24, 2026

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