# What AU names does a FACS practitioner assign to each ARKit blendshape, and which common FACS units has ARKit no shape for?

- id: art_01M5NNWTE8AGT20SCGTTKGEXGR
- type: article · status: active · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=source_inspected, execution=not_run, review=unreviewed
- categories: T07 · tags: none
- updated: 2026-10-24T00:45:12.003Z
- url: https://veyrul.com/articles/art_01M5NNWTE8AGT20SCGTTKGEXGR

Melinda Ozel's ARKit-to-FACS cheat sheet (updated 19 Feb 2026) maps each ARKit shape to FACS action units and muscles, flags ambiguous rows (e.g. mouthClose as AU8 'but see notes') and lists FACS units it says ARKit lacks (including AU11, AU13, AU23, AU38).

Melinda Ozel's ARKit-to-FACS cheat sheet (updated 19 Feb 2026) maps each ARKit shape to FACS action units and muscles, flags ambiguous rows (e.g. mouthClose as AU8 'but see notes') and lists FACS units it says ARKit lacks (including AU11, AU13, AU23, AU38).

Curator qualifications: Single practitioner's expert reading; the FaceShift confirmation is the author's report. Sensors and PLOS citations (E5, E6) handled under D4-05. Text only; no face tracking, rig or classifier run.

Limitations: Commercial practitioner site; live page.

Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

```json
{
  "citations": [
    {
      "url": "https://journals.plos.org/plosone/article/file?id=10.1371%2Fjournal.pone.0231266&type=printable",
      "note": "melindaozel.com ARKit to FACS Cheat Sheet ('Updated: Feb. 19, 2026')"
    },
    {
      "url": "https://melindaozel.com/arkit-to-facs-cheat-sheet/",
      "note": "melindaozel.com ARKit to FACS Cheat Sheet ('Updated: Feb. 19, 2026')"
    },
    {
      "url": "https://www.mdpi.com/1424-8220/26/3/1060",
      "note": "melindaozel.com ARKit to FACS Cheat Sheet ('Updated: Feb. 19, 2026')"
    }
  ]
}
```

Evidence claims:
- [sourced_fact] Melinda Ozel's ARKit-to-FACS cheat sheet (updated 19 Feb 2026) maps each ARKit shape to FACS action units and muscles, flags ambiguous rows (e.g. mouthClose as AU8 'but see notes') and lists FACS units it says ARKit lacks (including AU11, AU13, AU23, AU38). · locator: melindaozel.com ARKit to FACS Cheat Sheet ('Updated: Feb. 19, 2026') · source: https://journals.plos.org/plosone/article/file?id=10.1371%2Fjournal.pone.0231266&type=printable

Rights:
- documentation: license=unknown hosting=permitted redistribution=permitted modification=unknown training=unknown · Applies to this original summary only, not to the cited sources.

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