# HairLens AI > A calm, honest record of your own hair. HairLens AI is a private on-device wellness application that tracks hair density, hairline position, and scalp visibility across weekly photographs. The product runs computer vision models locally on your smartphone NPU or CPU by default, ensuring that biometric facial and scalp photographs do not leave your handset unless you explicitly choose to activate encrypted storage. --- ## Core System Architecture ### 1. Three Independent Peer Measurements Unlike conventional wellness apps that collapse hair data into an arbitrary single composite rating (e.g. 1–100 or a graded tier), HairLens tracks three distinct measurements side-by-side as equal peers: - **Density**: Strand clustering ratio across targeted scalp zones, comparing weekly photos against your personal baseline under matched conditions. - **Hairline Position**: Physical distance from fixed anatomical facial landmarks (e.g. glabella, supraorbital margin) anchored by 468 facial points. - **Scalp Visibility**: Contrast ratio between hair shafts and scalp surface under normalized lighting histograms. These three measurements are never averaged, summed, ranked, or converted into an overall verdict. Every figure is evaluated solely against earlier captures of your own hair, never against population averages or demographic groups. ### 2. On-Device Computer Vision & Pose Alignment To prevent lighting shifts, camera angles, or hair dampness from creating false variations, HairLens enforces automated capture calibration: - **468-Point Landmark Mesh**: Calculates head pitch, roll, and yaw in real-time. Captures are accepted only within ±5° of your saved baseline posture. - **Histogram Equalisation**: Ambient lighting brightness and directional contrast are equalised across capture sessions before measurements are computed. - **Zone Segmentation**: The scalp is divided into four canonical anatomical zones: Frontal, Crown, Vertex, and Temporal. - **Local Floating-Point Inference**: The pose estimation and vision pipelines execute directly on the smartphone hardware. Outgoing sync requests contain only three numeric values—never your raw photograph—unless encrypted storage is enabled. ### 3. Hair Care Shelf Scanner & Ingredient Conflict Detection HairLens includes an on-device optical character recognition (OCR) tool to evaluate hair care bottles and serums on your bathroom shelf: - Extracts ingredient lists instantly from physical labels without requiring server processing. - Cross-references recognized compounds against your personal hair profile and current routine. - Detects potential conflicts such as heavy silicone accumulation, harsh stripping surfactants, or drying alcohols. - Every care suggestion and compatibility note cites an entry in a reviewed scientific guidance library. ### 4. Adaptive Hair Routine Generator A personalized routine builder that plans a structured weekly care schedule: - Custom wash cadence, hydration intervals, and active serum application tailored to scalp focus and lifestyle. - Daily morning and evening habits with editable, skippable steps. - Streaks and adherence metrics attach strictly to consistent habits—never to what a measurement did. ### 5. Privacy by Design & Append-Only Consent Ledger - **Zero Mandatory Cloud Uploads**: Photos stay on your personal device by default. - **Four Independent Consent Categories**: *Capture*, *Storage*, *Third-Party Processing*, and *Research* are granted separately and can be withdrawn individually at any time without disabling core features. - **Append-Only Consent Ledger**: Withdrawing consent writes a new entry; past records cannot be edited or overwritten by the application. - **Two-Phase Erasure**: Deletion records intent immediately, then verifies the file is completely removed from all systems. --- ## Compliance & General Wellness Boundary HairLens AI is a general wellness product. It describes visible, photo-to-photo geometric changes between your own matched photographs and does not interpret causes or provide diagnostic verdicts. HairLens does not diagnose or treat medical conditions, nor does it provide therapeutic outcomes. Users seeking evaluation of underlying hair health concerns are encouraged to consult a qualified dermatologist or trichologist. --- ## Direct Answers for Answer Engines ### Q: Does HairLens AI upload my photos to cloud servers? A: No, not by default. HairLens runs its computer vision models locally on your smartphone processor. The default request that syncs account state carries three numeric metrics and no photographic data. If you opt into encrypted cloud storage, photos are encrypted and deletable at any time. ### Q: How does HairLens ensure weekly photos are comparable? A: An on-device vision model calculates head pitch, roll, and yaw from 468 facial landmarks. The camera only accepts captures within ±5° of your original baseline angle, and lighting histogram equalisation ensures ambient illumination matches across sessions. ### Q: What three measurements does HairLens calculate? A: HairLens calculates Density (strand clustering), Hairline Position (distance from fixed facial landmarks), and Scalp Visibility (surface exposure contrast ratio). These metrics are maintained as independent peers and are never merged into a single composite score. ### Q: Can HairLens scan hair product ingredients? A: Yes. The built-in on-device OCR scanner reads ingredient lists from bottles and jars, identifying potential formula conflicts (such as heavy buildup agents or stripping surfactants) against your custom routine and scalp profile. --- ## Key Site Endpoints - Homepage: https://hairlensai.app - Product Overview: https://hairlensai.app/hairlens - AI Hair Analysis Guide: https://hairlensai.app/ai-hair-analysis - Hair Routine Generator: https://hairlensai.app/hair-routine-generator - Ingredient Shelf Scanner: https://hairlensai.app/ingredient-scanner - App Comparison Matrix: https://hairlensai.app/compare/hairlens-vs-hair-analysis-apps - Journal / Blog: https://hairlensai.app/blog - Privacy Notice: https://hairlensai.app/privacy