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SmoothCSV vs TOPCAT: catalog facts
SmoothCSV	TOPCAT
Free Free to download; the site lists no paid tier.	Free Free to download.
Windows, macOS, Linux	Windows, macOS, Linux
Opens large CSV files quickly Familiar spreadsheet-style grid with multi-cell editing	Handles FITS, VOTable, CDF, CSV and Parquet Interactive exploration of large tables
Focused on CSV only, not a full spreadsheet with formulas and charts Maintained by one developer in spare time	Interface and features are oriented toward astronomy Requires Java
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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