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