Facesymai is a free online facial symmetry test tool that analyzes facial symmetry by uploading a photo and using AI. Its core purpose is to help users understand the degree of symmetry of their own face and see exactly which feature pairs differ.
Main capabilities:
- Upload a photo, and the model will place 68 facial landmarks and measure seven pairs of features around the midline: eyes, eyebrows, ears, nose, mouth, cheekbones, and jaw.
- Each feature pair is scored separately, so users can see which part of the face differs, rather than only getting an overall conclusion.
- The final score is the average of the seven feature-pair scores and describes the symmetry of a single photo, not a ranking comparison with other people.
- Photos are not stored.
How to use:
- Upload a photo.
- The detector locates and crops the face; if zero or multiple faces are detected, it will ask for a different photo.
- The landmark model marks the jawline, eyebrows, eyes, nose, and mouth.
- A vertical midline is drawn, then the distance from the left and right points in each feature pair to the midline is compared; the smaller the difference, the higher the score.
- The average of the seven pair scores is the overall score.
For more accurate measurements, it is recommended to:
- Use flat, even lighting, facing a window or light.
- Face the camera directly, keep the head level, and look at the lens.
- Use a solid-color background.
- Do not have obstructions on the face, such as hair, glasses, hats, etc.
Use cases:
- Personal curiosity or entertainment, to understand the symmetry of one's own face.
- Check the symmetry of specific feature pairs, such as eyes, eyebrows, mouth, etc.
Limitations:
- The score describes only one photo, not the face itself, and is not a ranking compared with others.
- Noise in ordinary photos (such as lighting and head angle) may affect the score as much as the face itself.
- A perfectly symmetrical face hardly exists; small differences are normal.
- If the score shows that one or two feature pairs deviate noticeably from the midline, it may be a real asymmetry, or it may be due to poor photo quality; it is recommended to retake the photo under flat lighting with the head level before interpreting it.
