GSAP 4.0 Alpha: Native Spring Physics and Scroll-Driven Timelines

GreenSock has unveiled the GSAP 4.0 Alpha, featuring a rebuilt core engine with native spring physics and seamless integration with browser Scroll-Driven Animation specifications, easing interactive UI development.

Physical Micro-interactions

The new spring solver lets elements bounce, stretch, and settle organically based on mass, tension, and damping coefficients. This makes micro-interactions like menu transitions and button presses feel tactile, realistic, and responsive to user input.

High-Performance Scroll Scrubbing

GSAP 4 binds directly to browser CSS scroll-timelines. This allows the browser to calculate scroll-scrub animations on the compositor thread, ensuring smooth animations even on low-powered mobile devices and avoiding main-thread junk.

The private alpha is available to GreenSock Club members today, with a public beta scheduled for next month, outlining a new level of animation control on the web.