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MonolingualWhatSize
Free

Free and open source under the GPL-3.0 licence.

 Paid

Shareware costing $14.99, with a $9.99 upgrade price and a 30-day free trial.

macOS macOS
  • Reclaims several hundred megabytes by removing unused localizations
  • Older versions kept available for many past macOS releases
  • Largest files and folders listed first
  • Finder-style column view for drilling into folders
  • Current version needs Apple silicon and macOS 27 or later
  • Removing system files carries some risk if you later need another language
  • macOS only
  • Paid after the 30-day trial
Downloadable app Downloadable app
Open source Closed source
License: GPL-3.0 License not stated
No account needed No account needed
Works offline Works offline

Checked October 2, 2026

Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.