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Safari Technology PreviewFirefox Developer Edition
Free

Free download from Apple.

 Free

Free to download and use.

macOS Windows, macOS, Linux
  • Latest WebKit engine ahead of stable Safari
  • Runs side by side with regular Safari
  • Newest developer tools before they reach stable Firefox
  • Builds for Windows, macOS and Linux, including ARM64
  • macOS only
  • Pre-release software that may be less stable
  • Pre-release software, so it can be less stable than the regular release
  • Not supported on Windows 8.1 and older or macOS 10.14 and older
Downloadable app Downloadable app
Closed source Open source
License not stated License: MPL-2.0
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked September 24, 2026

Checked September 23, 2026

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