カラーピッカーへ移動

無料のカラーAPI

色の解析と変換、コントラストのチェック、スケールやパレットの生成、色覚シミュレーション、デザイントークンの書き出しを、シンプルなHTTPで。APIキーも登録も不要で、入出力はJSONです。

  • APIキーも登録も不要
  • クエリパラメーター付きのGET、またはJSONでPOST
  • CORS対応で、どのサイトからでも呼び出せます
  • サイトと同じ計算：CSS Color 4
OpenAPI 3.1仕様AIアシスタントを使っていますか？それならMCPサーバーに接続しましょう

エンドポイント

  • Describe a color

    GET, POST /api/v1/parse-color

    Read any color and describe it: HEX, RGB, HSL and OKLCH values, the closest human name, the closest Tailwind class, its hue family, whether it fits sRGB and Display P3, and which text color, white or black, reads better on it.

    試す: /api/v1/parse-color?color=oklch%2862%25+0.21+260%29

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/parse-color \
  -H 'Content-Type: application/json' \
  -d '{"color":"oklch(62% 0.21 260)"}'

  • Convert a color

    GET, POST /api/v1/convert-color

    Convert a color between formats: hex, rgb, hsl, hsv, hwb, cmyk, lab, lch, oklab, oklch, display-p3, rec2020, xyz and platform code (swiftui, uikit, flutter, android). Values follow CSS Color 4.

    試す: /api/v1/convert-color?color=%23ff5733&formats=oklch%2Chsl%2Ccmyk

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/convert-color \
  -H 'Content-Type: application/json' \
  -d '{"color":"#ff5733","formats":["oklch","hsl","cmyk"]}'

  • Find colors by name

    GET, POST /api/v1/find-colors

    Search color names by words, like "sage", "dusty rose", "midnight blue" or "бордовый", and get their HEX values. Searches common names in English and Russian and about 30 000 extended color names. Use it to turn a description into real colors.

    試す: /api/v1/find-colors?query=sage&limit=5

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/find-colors \
  -H 'Content-Type: application/json' \
  -d '{"query":"sage","limit":5}'

  • Check text contrast

    GET, POST /api/v1/check-contrast

    Check text contrast against a background with both WCAG 2 (ratio, AA and AAA for normal and large text) and APCA (Lc value and the usage level it allows). Also suggests the nearest text color that passes AA and AAA while keeping its hue.

    試す: /api/v1/check-contrast?text=%236b7280&background=%23ffffff

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/check-contrast \
  -H 'Content-Type: application/json' \
  -d '{"text":"#6b7280","background":"#ffffff"}'

  • Fix contrast

    GET, POST /api/v1/fix-contrast

    Find the closest color that reaches a contrast target by changing only OKLCH lightness, so the hue and character stay. Targets: aa (4.5:1), aa-large (3:1), aaa (7:1), apca-body (Lc 75), apca-content (Lc 60), apca-large (Lc 45). Adjust the text color or the background.

    試す: /api/v1/fix-contrast?text=%23f97316&background=%23ffffff&target=aa&adjust=text

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/fix-contrast \
  -H 'Content-Type: application/json' \
  -d '{"text":"#f97316","background":"#ffffff","target":"aa","adjust":"text"}'

  • Audit a palette for accessibility

    GET, POST /api/v1/audit-palette

    Check every text and background pair in a palette with WCAG 2 and APCA, list which pairs are safe for body text, large text or only decoration, find colors that people with color blindness cannot tell apart, and flag colors outside sRGB. Use it before shipping a theme or chart palette.

    試す: /api/v1/audit-palette?colors=%230f172a%2C%23f8fafc%2C%232563eb%2C%23f97316%2C%2316a34a

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/audit-palette \
  -H 'Content-Type: application/json' \
  -d '{"colors":["#0f172a","#f8fafc","#2563eb","#f97316","#16a34a"]}'

  • Check gamut

    GET, POST /api/v1/check-gamut

    Check whether a color fits the sRGB, Display P3 and Rec. 2020 gamuts, and get the closest sRGB fallback that keeps lightness and hue (CSS Color 4 gamut mapping in OKLCH).

    試す: /api/v1/check-gamut?color=oklch%2870%25+0.3+145%29

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/check-gamut \
  -H 'Content-Type: application/json' \
  -d '{"color":"oklch(70% 0.3 145)"}'

  • Find color names

    GET, POST /api/v1/nearest-names

    Find the closest named colors, CSS color keywords and Tailwind CSS classes for a color, ranked by perceptual distance (deltaE OK).

    試す: /api/v1/nearest-names?color=%231e3a8a&limit=3

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/nearest-names \
  -H 'Content-Type: application/json' \
  -d '{"color":"#1e3a8a","limit":3}'

  • Compare two colors

    GET, POST /api/v1/compare-colors

    Compare two colors: CIEDE2000 and deltaE OK difference with a plain verdict (identical, nearly, similar, different, opposite), lightness shift in percent, chroma and hue shift, and the contrast between them.

    試す: /api/v1/compare-colors?first=teal&second=turquoise

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/compare-colors \
  -H 'Content-Type: application/json' \
  -d '{"first":"teal","second":"turquoise"}'

  • Generate a 50–950 scale

    GET, POST /api/v1/generate-scale

    Build an 11-step tint and shade scale (50, 100 … 900, 950) from one color in OKLCH, the same shape as Tailwind palettes, with even perceived lightness steps.

    試す: /api/v1/generate-scale?color=%233b82f6

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/generate-scale \
  -H 'Content-Type: application/json' \
  -d '{"color":"#3b82f6"}'

  • Tints, shades and tones

    GET, POST /api/v1/tints-shades

    Get tints (mixed with white), shades (mixed with black) and tones (mixed with gray) of a color, evenly spaced, as HEX. Good for hover states, borders and backgrounds.

    試す: /api/v1/tints-shades?color=%232563eb&steps=5

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/tints-shades \
  -H 'Content-Type: application/json' \
  -d '{"color":"#2563eb","steps":5}'

  • Color harmonies

    GET, POST /api/v1/harmonies

    Get color harmonies for a base color, computed in OKLCH so lightness stays even: complementary, split-complementary, analogous, triadic, tetradic, square and monochromatic.

    試す: /api/v1/harmonies?color=%23ff5733&kind=triadic

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/harmonies \
  -H 'Content-Type: application/json' \
  -d '{"color":"#ff5733","kind":"triadic"}'

  • Mix two colors

    GET, POST /api/v1/mix-colors

    Mix two colors at a ratio in a chosen color space, like CSS color-mix(). OKLab keeps the middle bright, sRGB tends to turn gray. Returns the result and a ready color-mix() expression.

    試す: /api/v1/mix-colors?first=%23ff5733&second=%233b82f6&amount=30&space=oklab

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/mix-colors \
  -H 'Content-Type: application/json' \
  -d '{"first":"#ff5733","second":"#3b82f6","amount":30,"space":"oklab"}'

  • Make a CSS gradient

    GET, POST /api/v1/make-gradient

    Build a CSS gradient from 2 or more colors with interpolation in OKLab, OKLCH or sRGB. Returns modern CSS with the color space, a fallback with precomputed stops for older browsers, and the stop colors. OKLab avoids the gray middle that sRGB gradients get.

    試す: /api/v1/make-gradient?colors=%232563eb%2C%23f97316&kind=linear&angle=90&space=oklab

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/make-gradient \
  -H 'Content-Type: application/json' \
  -d '{"colors":["#2563eb","#f97316"],"kind":"linear","angle":90,"space":"oklab"}'

  • Generate a palette

    GET, POST /api/v1/generate-palette

    Generate a harmonious palette in OKLCH. Keep colors you already have, pick a style (auto, analogous, complementary, triadic, monochromatic, pastel, vivid, muted, dark) and pass a seed to get the same palette every time.

    試す: /api/v1/generate-palette?keep=%230f172a&mode=analogous&size=5&seed=brand

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/generate-palette \
  -H 'Content-Type: application/json' \
  -d '{"keep":["#0f172a"],"mode":"analogous","size":5,"seed":"brand"}'

  • Simulate color blindness

    GET, POST /api/v1/simulate-cvd

    Show how colors look with protanopia, deuteranopia, tritanopia and achromatopsia (Machado 2009 at full severity), and list the pairs that become hard to tell apart.

    試す: /api/v1/simulate-cvd?colors=%23e11d48%2C%2316a34a%2C%232563eb

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/simulate-cvd \
  -H 'Content-Type: application/json' \
  -d '{"colors":["#e11d48","#16a34a","#2563eb"]}'

  • Export colors as code

    POST /api/v1/export-tokens

    Turn a list of colors into ready code: CSS custom properties, a Tailwind v4 @theme block, SCSS variables, JSON, W3C design tokens (DTCG), a JavaScript array or an SVG swatch strip. Unnamed colors get their closest color name.

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/export-tokens \
  -H 'Content-Type: application/json' \
  -d '{"colors":[{"color":"#0f172a","name":"ink"},{"color":"#f97316"}],"format":"tailwind","values":"oklch"}'

  • Build a design system

    GET, POST /api/v1/build-system

    Build a full color system from a brand color: 50–950 scales for primary, secondary, accent, neutral and status colors, light and dark theme roles, exported as a Tailwind v4 theme, CSS variables, shadcn/ui globals.css or DTCG tokens, with a contrast audit of text and surface pairs.

    試す: /api/v1/build-system?primary=%236d4aff&format=shadcn

    POSTのボディ

    curl -X POST https://pickshade.com/api/v1/build-system \
  -H 'Content-Type: application/json' \
  -d '{"primary":"#6d4aff","format":"shadcn"}'

制限

1つのIPアドレスから送れるリクエストは毎秒約10件で、短時間のバーストは許容されます。これを超えるとAPIはRetry-Afterヘッダー付きの429を返します。結果が変わらないリクエストは1日キャッシュされるため、同じ呼び出しは即座に返ります。

よくある質問

APIキーは必要ですか？

いいえ。APIは無料で公開されています。サーバー、スクリプト、ブラウザから、HTTPSでエンドポイントを呼び出すだけです。

どのカラーフォーマットに対応していますか？

あらゆるCSSの色に対応しています。HEX、rgb()、hsl()、hwb()、lab()、lch()、oklab()、oklch()、color(display-p3 …)のほか、navyのようなCSSの色名、royal blueのような一般的な色名、sky-500のようなTailwindクラスも使えます。

エラーはどのように返されますか？

エラーはapplication/problem+json形式で返され、titleと、何を直せばよいかを示すdetailが含まれます。たとえば文字列を色として読み取れなかった場合などです。