How to add perfect sync to any VRM — without touching Blender

'Perfect Sync' is the VTuber term for full iPhone-grade facial tracking. It means your model carries the 52 ARKit blendshapes — browInnerUp, eyeBlinkLeft, jawOpen, mouthSmileLeft and 48 more — and that each one is mapped into a VRM expression (a BlendShapeClip in VRM 0.x, an Expression in VRM 1.0). Apps like VSeeFace, Warudo, VMagicMirror, Vear and Luppet read those clips by name. Miss a few names and you get the classic 'we recognized 45 of your 52 shapes' message.

So the job is really two jobs that often get confused: (a) creating the 52 shape-key deformations on the mesh, and (b) wiring and naming them into VRM clips. A model can have one without the other.

• Blender + FACEIT. FACEIT can fit and generate ARKit shapes, but it exports FBX shape keys — you then have to bring them into Unity and UniVRM and rebuild the VRM yourself. Powerful, but a real pipeline to learn.
• Polywink. Fully automatic shape generation with a ~24h turnaround, but it outputs FBX/Maya/Unity/UE — never a VRM — and is priced for studios.
• A Fiverr freelancer. $10–100 and about a day per model, sculpted by hand. It works, but every time you edit the model you pay again.
• HANA_Tool. Free and one-click — but only for VRoid-topology models. The moment your model is custom, it can't help.

Riggle collapses the whole pipeline into a browser upload:

1. Upload your .vrm, .glb or .fbx. Riggle isolates the face mesh and fits an ARKit template to its neutral pose — any topology, not just VRoid.
2. Generate. Deformation transfer builds all 52 ARKit shapes plus Joy/Angry/Sorrow/Fun/Surprise and the A/I/U/E/O visemes, then names and wires them into VRM clips for 0.x or 1.0.
3. Preview. Scrub every expression in the browser and catch a bad eyelid or jaw before you download.
4. Download a named, validated VRM that's perfect-sync ready in VSeeFace, Warudo and VMagicMirror.

If your model already has shape keys that just aren't wired, the free Validator renames and wires them without regenerating anything.

Be honest with yourself about your mesh. Clean, human-ish topology transfers cleanly and comes back perfect. Heavily stylized anime and furry models — oversized eyes, separate eye/teeth sub-meshes, non-manifold geometry — are exactly where automatic transfer can produce artifacts. That's why Riggle shows you every shape in the browser before you download, and why the Studio plan adds a human QA pass for the tricky meshes. Preview first; don't assume one-click perfection on a furry model.