Compare software

Tad vs TOPCAT: catalog facts
Tad	TOPCAT
Free Free and open source under the MIT licence.	Free Free to download.
Windows, macOS, Linux	Windows, macOS, Linux
Opens CSV, Parquet, SQLite and DuckDB data in one app Pivot table view for exploring data without code	Handles FITS, VOTable, CDF, CSV and Parquet Interactive exploration of large tables
Hobby project with known bugs and rough edges Releases are infrequent; the latest is from June 2024	Interface and features are oriented toward astronomy Requires Java
Downloadable app	Downloadable app
Open source	Closed 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 October 1, 2026

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