Symmi

Face analysis, on your phone

Join 5,000+ people who measured instead of guessed.

Measured.
Not guessed.

478 landmarks, 19 readings in degrees and ratios, and a 3D model of your face on Face ID iPhones. Your photo never leaves the phone.

Get SymmiTry a free tool →

Measured

478 landmarks, not an opinion

On device

your photo never uploads

Free first scan

readings before any paywall

A face modeled in 3D inside Symmi

478landmarks

placed on every face, in the browser or the app

19readings

angles and ratios, each scored against its band

3Don Face ID iPhones

a TrueDepth model you can turn and relight

Why invest in your appearance?

Looking your best
can make a difference.

From first impressions to dating and work, appearance can influence how others respond to you. Explore the research, then focus on the choices you can make your own.

Try it for yourself

Bring your features into focus

Explore hair, frames and grooming that suit your proportions and taste. Start with one small change, then compare it in the same lighting.

Explore your face shape

These studies describe perceptions and associations, not results from using Symmi. Improving your presentation does not guarantee a job, a date or a particular outcome.

Find your starting point →

Studies show

Most of what you see in the mirror
is below the threshold of noticing.

These are the published numbers Symmi scores against. Every reading is placed on a band drawn from measurements like these, not from an opinion.

6mm

A chin has to sit 6 mm off centre before an ordinary person notices. Eyelid 2 mm, mouth corner 3 mm, brow 3.5 mm, nose tip 4 mm.(1)

Wang, 2017. Aesthet Surg J.

93%

Of 100 people measured before eyelid surgery, 93% had at least 1 mm of left-right difference in brow or eyelid position.(2)

Macdonald, 2014. J Otolaryngol Head Neck Surg.

13→51%

The same men were judged attractive 13.5% of the time on a 50 mm lens and 51.1% on a 105 mm lens. Same faces, same light.(3)

Třebický, 2016. PLoS ONE.

30%

A selfie taken at 12 inches makes the base of the nose look about 30% wider than a photo taken from further back.(4)

Ward, 2018. JAMA Facial Plast Surg.

73%

73% of healthy newborns already had at least one head or neck asymmetry on the day they were photographed.(5)

Stellwagen, 2008. Arch Dis Child.

9.3mm

Jaw width read from a flat photo missed the caliper by 9.3 mm on average, with an agreement score of only 0.16.(6)

Lim, 2022. Front Public Health.

Evidence review

Does it actually work?
The trials, the reviews, the honest verdicts.

Every method people try on their face, graded on what has been measured. Most habits land on works a little. Styling changes the look, not the face. A few things only a clinic can do.

Same face, different habits

What changes
when the habits change.

Drag the line. Left is the untreated version: one-sided chewing bulking one masseter, a heavier eyelid, a dropped mouth corner, fluid under the chin, a tilted head. Right is the same person with the muscle evened out, the swelling gone, the head level and the grooming done. Bone is identical on both sides.

  1. [1]Masseter · chew on both sides, the bulk evens out
  2. [2]Eyelid and brow · sleep, salt and screen time show here first
  3. [3]Mouth corner · posture and jaw rest position
  4. [4]Under the chin · fluid and body fat, the fastest layer to move
  5. [5]Head position · ears over shoulders, chin level

Example faces, generated for this page. An illustration of the layers that move, not a result or a promise.

Example face, untreated version and the same person with habits corrected
BeforeAfter
Example face, untreated version and the same person with habits corrected
BeforeAfter

What you get back

Your face,
with the lines on it.

This is the photo after the free symmetry tool has placed its landmarks and drawn where each reading was measured. Real output on an example face; every number you get back points at one of these lines.

  1. [1]Midline · glabella to chin, corrected for head roll
  2. [2]Eye line · inner corners, tilt read against it
  3. [3]Brow line · height difference in % of face width
  4. [4]Mouth corners · level or dropped, and by how much
  5. [5]Chin offset · distance from the midline
Example face with the symmetry tool's measurement lines drawn on it: midline, eye line, brow line, mouth corners and chin offset

How it works

A number you can check,
instead of an opinion you cannot.

The old way

  • 01Ask a chatbot for a rating
  • 02Stare at a mirror
  • 03Ask a friend who says you look fine
  • 04Fixate on one feature
  • 05No baseline, so nothing to compare

The new way

  • Step 1ScanOne front photo, framed the same way each time.
  • Step 219 readingsAngles and ratios, each with the band it is scored on.
  • Step 33D on Face IDA TrueDepth model you can turn and relight.
  • Step 4RescanThe same readings again, so change shows up as a number.
  • Step 5RoutineGua sha, ice and a 30-day plan for the parts that move.

Why photos disagree

Your camera
has an opinion.

Lens, distance and a few degrees of head turn change the face in the frame before anyone measures anything. Symmi fixes the framing first, then reads the numbers.

  • LensThe same 45 faces were rated by 369 people at 50, 85 and 105 mm. Judged-attractive rates roughly tripled between the two ends, with nothing but the focal length changed.(3)
  • DistanceHeld at 12 inches, a phone makes the base of the nose look about 30% wider than a photo taken from further back.(4)
  • Head turnTurning the head 5° to 10° already distorts the size readings on a flat photo; roll and turn together also distort shape readings such as the jaw angle.(7)
  • MirrorPeople reliably prefer the mirrored version of their own face, and their friends reliably prefer the unmirrored one. Neither of you is seeing the same face.(8)

What we measure

Nineteen readings,
five regions.

Free in your browser

Start with one reading.

fWHR CalculatorCheekbone width over upper-face height, the proportion the research papers use.1.92ratioFace Symmetry TestSymmetry index plus eight left-right readings, drawn on your photo.94indexFace Shape DetectorOval, round, square, heart, diamond or oblong, with the numbers behind it.1.36length : width
All 14 tools →

Same face, three views

One face.
Three angles, three sets of readings.

The browser tools read the front view. The app adds the three-quarter view, and on Face ID iPhones builds the full 3D model. Example face, generated for this page.

Example face, front view
Front

Measured in the browser

Example face, three-quarter view
Three-quarter

Measured in the app

Example face, profile view
Profile

3D on Face ID iPhones

Precision

Retake the photo.
Same number.

Three example faces were each measured five times: the original, tilted ±1.5°, downscaled to 90% and darkened by 15%. The spread is half the range between the highest and lowest run, taken from the worst of the three faces.(10)

Full repeatability table →
ReadingUnitRunsSpread
Symmetry index0–1003 × 5±0.5
Chin offset% of face width3 × 5±0.2
Canthal tiltdegrees3 × 5±0.4
Jaw angledegrees3 × 5±0.4
Jaw : face widthratio3 × 5±0.01
fWHRratio3 × 5±0.01
Midface ratioratio3 × 5±0.01

Measured 2026-09-12 with the exact code that runs on this site. Lens distance is not part of this test and moves readings more than anything here; take the same kind of photo each time.

Inside the app

Nineteen readings.
One model. One plan.

Report
Report

Every reading with its band

Readings
Readings

Angles and ratios, side by side

Routine
Routine

Gua sha, ice and a 30-day plan

Symmi habits and rescan screen

Track it

Rescan next month.
Compare the numbers, not the feeling.

Every scan is stored on your phone with its readings. Rescan under the same light and framing and the app lays the two sets side by side, so a change shows up as a number rather than an impression. The routine sits next to it: gua sha, ice and a 30-day plan you tick off day by day.

  • Scan historykept on device
  • Comparisonreading by reading
  • Routine30 days

Bone is given, habits are yours

Same DNA.
Different faces.

147 pairs of identical twins, eight facial measurements. The pairs were pulled apart by what they did, not what they inherited. Symmi cannot move bone. It measures the parts that habits reach, and gives you a routine for them.(9)

  • Sleeping face downlinked to nose midline and mouth-corner asymmetry
  • Tooth extractionlinked to a tilted bite plane
  • Wearing dentureslinked to nose midline and mouth-corner asymmetry
  • Smokinglinked to a tilted bite plane and a drooping upper eyelid

Reading

What actually shapes a face.

Photos · 8 minWe Measured Every Photo Trick in the Fraudmaxxing GuideRead →Proportions · 9 minIdeal Facial Ratios: The Full List, MeasuredRead →Symmetry · 5 minDoes Face Yoga Improve Facial Symmetry?Read →

Privacy

Your photo
stays yours.

The browser tools place the landmarks and compute every reading inside your browser tab. Close the tab and the photo is gone. The app does the same on the phone: scans, readings and the 3D model are stored on the device, and nothing is uploaded to be analysed.

0

photos uploaded

On device

landmarks and readings

On device

scan history

FAQ

Straight answers.

One reading here.
Nineteen in the app.

Get SymmiTry a free tool →

References

  1. (1)Wang TT et al. Aesthet Surg J 2017;37(4):375-385.
  2. (2)Macdonald KI et al. J Otolaryngol Head Neck Surg 2014;43:36.
  3. (3)Třebický V et al. PLoS ONE 2016;11(2):e0149313.
  4. (4)Ward B et al. JAMA Facial Plast Surg 2018;20(4):333-335.
  5. (5)Stellwagen L et al. Arch Dis Child 2008;93(10):827-831.
  6. (6)Lim YC et al. Front Public Health 2022;9:813058.
  7. (7)Gateño J et al. J Oral Maxillofac Surg 2011;69(3):655-662.
  8. (8)Mita TH, Dermer M, Knight J. J Pers Soc Psychol 1977;35(8):597-601.
  9. (9)Liu MT, Iglesias RA, … Guyuron B. Plast Reconstr Surg 2014 Oct.
  10. (10)Symmi repeatability test, 12 September 2026. Three example faces, five runs each, measured with the code that runs on this site. Full table on the methodology page.