robb0wen/tornis

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1591 stars · 35 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Tornis is a minimal JavaScript library that watches and tracks the state of the browser's viewport, including mouse position, scroll position and velocity, viewport size, and device orientation. It uses a throttled, requestAnimationFrame-based store so subscribed functions only run when values change and the browser is ready to render.

Use cases

• track scroll position and velocity in the browser
• react to mouse cursor movement and velocity
• create parallax and scroll-driven effects
• monitor viewport size changes on resize
• track device orientation and pixel ratio
• optimize scroll/resize handlers for render performance

When to choose

• you need combined viewport state (scroll, mouse, size) in one store
• you want performant, throttled viewport tracking instead of raw event handlers
• you're building scroll- or cursor-driven visual effects in vanilla JS

When to avoid

• you need a full parallax library with built-in effects
• you're working in a framework with its own reactive state system
• you need server-side or non-browser viewport tracking

Facets

library · maturity maintenance

state-management developer-tools frontend web-development browser-extensions browser viewport-tracking scroll-velocity mouse-position requestanimationframe performance-optimization javascript

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