Support

Questions, bug reports and file formats Rowscope should read: email support@frostycle.com. We read every message.

To help us help you, include

your macOS version and the Rowscope version (from Rowscope › About Rowscope);
the file’s size, and the delimiter and encoding shown in the status bar;
what you expected and what happened instead.

Please don’t send files with personal or confidential data. A few rows with the values changed are usually enough.

Common questions

Can Rowscope change or damage my file?: No. Rowscope only reads the file you open: there is no save and no autosave. Export always writes a new file, and it refuses to use the open file as its destination.
How big a file can it open?: We test with files up to 2 GB and 25 million rows. Rowscope reads only what is on screen and keeps a small index, so memory barely changes with file size; larger files mostly take longer to index.
Can I edit cells?: No, Rowscope is a viewer. To reshape a file, export the columns and rows you want to a new file, with a different delimiter, encoding or line endings if you need them.
Which formats does it read?: CSV and TSV files separated by commas, semicolons, tabs or pipes, encoded as UTF-8 (with or without a BOM) or Windows-1252. UTF-16 files are not supported yet.
What happens with a broken file?: It still opens. A stray quote, a ragged row or an invalid byte is flagged on that row, and an unclosed quote is reported with the row where it starts.
Does it open Excel or Numbers files?: No. Rowscope opens plain-text CSV and TSV files. Save a spreadsheet as CSV first.
Does anything I open leave my Mac?: No. Rowscope has no network access, no account and no analytics. See the privacy policy for the details.
Will it take over my CSV files?: No. Rowscope offers itself as an alternative for CSV and TSV files and never replaces your default app. To make it the default, use Get Info in the Finder.
Which Macs does it run on?: Any Mac that runs macOS 26 or later.