From AR overlay to full re-rendering
Old virtual try-on tools detected your face and pasted a semi-transparent wig on top of it. The result never convinced anyone: the hair floated, the lighting never matched, and the moment you tilted your head the illusion fell apart.
Generative AI takes another path entirely. Instead of layering hair over your photo, the model re-renders the whole image with your description applied — new hair grown naturally from your scalp, matching the lighting, grain and perspective of the original shot.
Identity preservation is the hard part
The real engineering challenge is not drawing nice hair — any image model can do that. The challenge is keeping everything else untouched: your bone structure, skin tone, expression, the background, even the sensor noise of your camera.
That is why the prompt behind every 3xrun generation contains explicit identity-locking instructions. Only the hair region is allowed to change; the rest of the photo is constrained to stay exactly as it was. This is also the honest way to preview a haircut: if the face changes, the preview tells you nothing about how the cut will look on you.
What happens when you press Generate
Your selfie is compressed and uploaded, then the request is assembled: your chosen hairstyle, an optional color instruction, and your gender presentation, all merged into one instruction for the model.
Generation takes a few seconds to half a minute depending on the model. The result is stored privately, linked to your anonymous session, and shown next to your original photo in a draggable before/after view. Nothing is published anywhere — only you can see it.
Why a realistic preview changes real-world decisions
Most haircut regret comes from imagination gaps: you picture one thing, the mirror shows another. A faithful preview narrows that gap to nearly zero before any scissors come near you.
It also flips the conversation with your barber. Instead of describing a style with words, you bring a photo of yourself actually wearing it — the single most useful reference a stylist can get.