motionspec

The official MotionSpec server. Verifies and compiles the UI animation inside AI-generated web apps. Two keyless tools. motion_catalog returns the 40 verified motion primitives with their parameter schemas, defaults and authoring rules — call it first, then write the spec. motion_validate checks a spec fail-closed against the schema, the primitive allow-list, parameter bounds and injection rules; it returns ok=false with precise errors instead of guessing. Nothing you submit is stored. Every primitive ships a mandatory prefers-reduced-motion fallback, and the continuous ones carry a WCAG 2.2.2 (Pause, Stop, Hide) pause path. A validated spec compiles deterministically to on-budget GSAP or dependency-free WAAPI/CSS — same input, same bytes. MIT core on npm (motionspec). Docs and a free motion check for any URL: https://motionspec.dev Not Motion.dev / Framer Motion, not the Android or iOS MotionSpec classes, not the usemotion.com calendar app, not a video generator.

First seen 2 Oct 2026. Evidence as of 2 Oct 2026.