Yes, Gander is free on the Mac App Store, with no subscription.

Which files can it preview?

Code in 30 languages with Finder thumbnails, Markdown with Mermaid diagrams, JSON and JSONL, SQLite databases, TSV tables, Jupyter notebooks, log files, diffs and patches, plist and XML, .env files with values hidden, and archives.

Does it upload my files?

No. Everything is rendered locally on your Mac.

What macOS version does it need?

macOS 15 or later, on Apple silicon or Intel.

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Gander

One Quick Look app for every file a developer opens

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ganderfinder.comPicture of the site, scroll to see it allOpen ↗︎

About

Gander is a developer tool app for Mac:One Quick Look app for every file a developer opens.Price: Free.It runs on Apple silicon.A person has not checked it yet.

Gander is a Quick Look extension for macOS. Select a file in Finder and press Space to preview Markdown with Mermaid diagrams, JSON, JSONC and JSON Lines, CSV and TSV, XML, SQL, SQLite databases, Jupyter notebooks, logs, .env files, YAML, TOML, code and archives. Markdown exports to PDF, Word, RTF or HTML, and CSV files convert to Excel. Everything runs on your Mac.

Facts

Price: Free
Requires: macOS 15 Sequoia or later
Built with: Other
Runs on: Apple silicon and Intel
Checked on MacPip: Check pending
Categories: Developer Tools, Productivity
Launched: Saturday, November 7
Website: ganderfinder.com ↗︎

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An alternative to

QLMarkdownSee alternatives on MacPip PeekSee alternatives on MacPip Syntax Highlight (QLColorCode)See alternatives on MacPip Quick Look ProSee alternatives on MacPip

Questions

Is Gander free?: Yes, Gander is free on the Mac App Store, with no subscription.
Which files can it preview?: Code in 30 languages with Finder thumbnails, Markdown with Mermaid diagrams, JSON and JSONL, SQLite databases, TSV tables, Jupyter notebooks, log files, diffs and patches, plist and XML, .env files with values hidden, and archives.
Does it upload my files?: No. Everything is rendered locally on your Mac.
What macOS version does it need?: macOS 15 or later, on Apple silicon or Intel.

Answers from the maker.