Tween is a native Mac app for drawing Bezier shapes, animating them, and exporting real working code — SwiftUI, SVG, Android, Compose, Flutter, or a transparent video. Import existing SVGs, snap shapes into alignment automatically, or describe what you want to a built-in AI assistant that builds it on the canvas.
Every Take, Perfectly Timed
Built Line by Line
Cut to the Moment
Sketch the Whole PageLinear and radial, with a free-form reorderable stop list — add, remove, and recolor stops directly on the canvas.
Every fill, stroke, and text color has its own opacity slider — carried through to every export format, including SVG and Canvas.
Hide, lock, rename, reorder, and multi-select shapes, text, and images — without leaving the canvas you're working on.
iPhone, iPad, and common Android phone/tablet/foldable presets, so your exported coordinates match a real screen.
Every edit — including layer reordering and visibility — is a real undo step, all the way back.
A .bezierpath project is a single JSON file — images and all — easy to version or hand off.
Bring your own Anthropic or OpenAI key and describe what you want — it builds shapes, motion, and timing directly on the canvas using the same tools you'd use by hand.
Drag a point, a text label, or an image near another layer's center — or the canvas's own center — and it snaps into place with a live guide line.
SVG markup, a raster image, or an SF Symbol — paths, shapes, groups, and transforms come in as real editable points, or get automatically traced to vector.
Round, square, or flat caps, plus adjustable dash length and gap, all in their own section of the inspector.
Arrow up/down steps any value by one — or by a tenth on 0–100% fields — no dragging a slider for a precise number.
The mouse's x/y position and the canvas's own width/height show right above the canvas as you work.
Sketch freehand with the mouse and it's automatically simplified and smoothed into a clean, editable curve — no pen-tool precision required.
Draw with the pen tool, import an SVG or image, animate it on the Animate tab, then export straight to code. A short step-by-step walkthrough plus the shortcuts and tricks that aren't obvious at first glance are one click away.
Every feature works for 3 days, no account or card required. PDF/PNG/SVG/video exports stay watermarked during the trial; unlock once to remove it and keep using the app forever.
Email hello@cygnus-x.com — questions, bugs, and feature requests all welcome. We usually reply within a day or two.