VS Code

Sheet Glance

Sheet Glance opens .xlsx, .xlsm, .xls, .ods, .csv, and .tsv files in VS Code as a read-only grid, with sheet tabs, sort, filter, and scrolling through large files. The free version is complete on its own. There is no account and no telemetry. It runs offline.

Price and where to get it

Free. Pro is $9, once, on Gumroad.

Marketplace Buy Pro · $9

What it does

Free, with no upgrade nag.
Pro is an optional $9 one-time add-on on Gumroad, not a subscription, and it does not use an account or a license key.
Pro adds CSV and TSV editing with save and undo (untouched rows are written back in the file's original encoding), search across sheets, column stats, export to CSV, TSV, JSON, or Markdown, and a comparison of two sheets or files.