Safari Technology Preview
A Mac browser that previews upcoming WebKit features before they reach Safari.
Free
Overview
Safari Technology Preview is a web browser app for macOS built on the most recent version of WebKit, the engine that powers Safari. It gives developers an early look at upcoming HTML, CSS and JavaScript features, along with the latest Web Inspector and Responsive Design Mode.
It is a standalone app that runs side by side with the current Safari and works with iCloud for Favorites, bookmarks and Reading List. New releases arrive every few weeks, each with its own release notes, and issues can be reported to Apple from the app's Help menu through Feedback Assistant.
Latest WebKit
Includes the most recent WebKit, with new HTML, CSS and JavaScript features.
Developer tools
Ships the newest Web Inspector and Responsive Design Mode for debugging.
Side by side
Runs as a separate app next to Safari and syncs bookmarks through iCloud.
Built-in feedback
Report issues to Apple via Feedback Assistant from the Help menu.
History
How it grew up.
First release
Safari Technology Preview 1 ships, followed by 20 releases in its first year.
Release 200
Safari Technology Preview reaches its 200th release.
Two macOS builds
Release 254 is offered as separate builds for macOS 27 and macOS 26.4 or later.