Safari Technology Preview Release 49 is now available for download for macOS Sierra and macOS High Sierra.

Release Notes for Safari Technology Preview 48

Safari Technology Preview Release 48 is now available for download for macOS Sierra and macOS High Sierra.

Speedometer 2.0:
A Benchmark for Modern Web App Responsiveness

In 2014, the WebKit team at Apple released Speedometer 1.0, a benchmark for web app responsiveness.

Safari Technology Preview Release 47 is now available for download for macOS Sierra and macOS High Sierra.

Security researchers have recently uncovered security issues known as Meltdown and Spectre.

Safari Technology Preview Release 46 is now available for download for macOS Sierra and macOS High Sierra.

Safari Technology Preview Release 45 is now available for download for macOS Sierra and macOS High Sierra.

Safari Technology Preview Release 44 is now available for download for macOS Sierra and macOS High Sierra.

Safari Technology Preview Release 43 is now available for download for macOS Sierra and macOS High Sierra.

Safari Technology Preview Release 42 is now available for download for macOS Sierra and macOS High Sierra.

Safari Technology Preview Release 41 is now available for download for macOS Sierra and macOS High Sierra.

Today we’re excited to roll out some improvements to how we deliver WebKit builds.