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TOPCAT vs Tabiew: catalog facts
TOPCAT	Tabiew
Free Free to download.	Free Free to use; the source is published on GitHub.
Windows, macOS, Linux	Command line
Handles FITS, VOTable, CDF, CSV and Parquet Interactive exploration of large tables	Opens CSV, TSV, Parquet and Arrow files SQL queries on the loaded data
Interface and features are oriented toward astronomy Requires Java	Viewer and query tool rather than a full data editor Terminal interface takes some learning
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License not stated
No account 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.