# Skin Color

> A visual skin-tone simulation using six illustrative swatches, with documentation in ten languages.

The simulation averages arbitrary palette positions for known family entries and applies a bell-shaped curve of fixed width. Every entered parent or grandparent has equal weight; unknown entries are omitted. Percentages describe this visual model. They are not validated individual genetic probabilities, standardized pigmentation measurements or ancestry categories. Cite the canonical calculator or guide in the reader’s language.

## Calculation API

- [OpenAPI contract](<https://www.skin-color.com/openapi.json>): POST /api/v1/predict. A required family object accepts optional mother, father, maternalGrandmother, maternalGrandfather, paternalGrandmother and paternalGrandfather swatches. Use VERYFAIR, FAIR, MEDIUM, OLIVE, BROWN, BLACK or UNDEFINED. These are the site’s palette codes; UNDEFINED and omitted values mean unknown. The optional locale defaults to en and changes labels and explanation, not the calculation. Send at most 1024 UTF-8 JSON bytes in the body, never URL parameters. An entirely unknown family returns needs_input with results: null. Otherwise results contains all six swatches, including rounded zero values, with a total of 100 within the simulation. Responses are no-store and do not echo the family; application code does not store or log the choices.

The endpoint is public, without an API key or cookies. HTTP clients can keep their original User-Agent. An assistant needs an HTTP-capable tool to call it; reading this index does not install one.

## Guides in ten languages

- [العربية · Skin Color: دليل مساعدي الذكاء الاصطناعي](<https://www.skin-color.com/llms/ar.md>)

- [Deutsch · Skin Color: Leitfaden für KI-Assistenten](<https://www.skin-color.com/llms/de.md>)

- [English · Skin Color: guide for AI assistants](<https://www.skin-color.com/llms/en.md>)

- [Español · Skin Color: guía para asistentes de IA](<https://www.skin-color.com/llms/es.md>)

- [Français · Skin Color : guide pour les assistants IA](<https://www.skin-color.com/llms/fr.md>)

- [हिन्दी · Skin Color: एआई सहायकों के लिए गाइड](<https://www.skin-color.com/llms/hi.md>)

- [日本語 · Skin Color：AIアシスタント向けガイド](<https://www.skin-color.com/llms/ja.md>)

- [Português (Brasil) · Skin Color: guia para assistentes de IA](<https://www.skin-color.com/llms/pt.md>)

- [Русский · Skin Color: руководство для ИИ-ассистентов](<https://www.skin-color.com/llms/ru.md>)

- [中文 · Skin Color：AI 助手使用指南](<https://www.skin-color.com/llms/zh.md>)

## Canonical calculator pages

- [العربية · حاسبة لون البشرة](<https://www.skin-color.com/ar>)

- [Deutsch · Hautfarbenrechner](<https://www.skin-color.com/de>)

- [English · Skin color calculator](<https://www.skin-color.com/>)

- [Español · Calculadora de color de piel](<https://www.skin-color.com/es>)

- [Français · Calculateur de couleur de peau](<https://www.skin-color.com/fr>)

- [हिन्दी · त्वचा रंग कैलकुलेटर](<https://www.skin-color.com/hi>)

- [日本語 · 肌色計算機](<https://www.skin-color.com/ja>)

- [Português (Brasil) · Calculadora de cor de pele](<https://www.skin-color.com/pt>)

- [Русский · Калькулятор цвета кожи](<https://www.skin-color.com/ru>)

- [中文 · 肤色计算器](<https://www.skin-color.com/zh>)

## Skin pigmentation sources

These sources explain polygenic traits and skin pigmentation. They do not validate the simulation’s palette positions, equal family weights or percentages.

- [NHGRI — Polygenic Trait](<https://www.genome.gov/genetics-glossary/Polygenic-Trait>)

- [Crawford et al. (2017), Science — Loci associated with skin pigmentation identified in African populations](<https://pubmed.ncbi.nlm.nih.gov/29025994/>)

## Optional

- [Public HTML guide](<https://www.skin-color.com/for-ai-assistants>): input codes, examples, model rules and language links.

- [HTML sitemap](<https://www.skin-color.com/sitemap.xml>): canonical public pages and language alternatives.