Symmi

Editorial standards

How we source.

Every free tool on this site ends with a list of the published research behind it, and every article ends with its sources. These are the rules we follow when we choose and check them.

  1. 1

    Peer-reviewed first

    We cite systematic reviews and meta-analyses where they exist, then anthropometric and clinical studies. We do not cite blogs, other face-rating sites or AI-generated text as evidence.

  2. 2

    Every reference is checked

    Before a source goes on a page we look it up in PubMed, Crossref or arXiv and match the authors, year, title and journal to the record. Each link goes to PubMed, a DOI or the preprint.

  3. 3

    We say what each paper shows

    Every source has one line describing what it actually found or covers, including findings that cut against a popular idea, such as studies showing the golden ratio does not describe attractive faces.

  4. 4

    Research and our measurement are kept apart

    Published studies set the definitions and reference ranges. Our tools measure your photo against them. We say which is which, and we do not present a correlation as a cause.

  5. 5

    Methods differ, so numbers differ

    Studies measure the same feature in different ways and in different populations. We state the method we use and ask you to compare your result only with the range shown on the same page.

  6. 6

    Weak evidence is labelled

    Some popular ideas, such as habits or posture changing face shape, are only lightly studied. Where evidence is limited we say so instead of stating it as fact.

  7. 7

    Styling systems are named as styling systems

    Face-shape names and seasonal colour analysis are conventions from styling, not scientific classifications. We describe them that way.

  8. 8

    Not medical advice

    Symmi is a wellness and self-care tool. It does not diagnose or treat any condition. Questions about health, jaw pain or surgery belong with a qualified clinician.

Our own data

Alongside published research we publish how stable our own readings are when the same face is photographed again. See the methodology page.

Found a problem?

If a source is wrong, outdated or does not say what we wrote, tell us through the Support link at the bottom of every page and we will correct it.

Published by TidalAurum LLC · Last reviewed 18 October 2026