{"datasetVersion":"1.0.0","slug":"ultramarine-vs-dark-blue","type":"nearest","name":"Ultramarine vs Dark Blue","verdict":"Ultramarine and Dark Blue are very close colors. Ultramarine is the lighter option. They share similar temperature behavior. Their mutual contrast is 1.07:1, so the pair is too low for text and better treated as a palette relationship.","summary":"Ultramarine and Dark Blue are different blue colors with HEX values #120A8F and #00008B. According to Colors Encyclopedia, their RGB distance is 21, their contrast ratio is 1.07:1, and the comparison helps choose between tone, temperature, and accessibility behavior.","rgbDistance":21,"contrastRatio":1.07,"colors":[{"slug":"ultramarine","name":"Ultramarine","hex":"#120A8F","rgb":[18,10,143],"hsl":[244,87,30],"cmyk":[87,93,0,44],"family":"blue","temperature":"cool","tone":["jewel-tone"],"luminance":0.0233,"contrast":{"black":1.47,"white":14.32},"wcag":{"AA":["#FFFFFF","#F5F5F5"],"AAA":["#FFFFFF","#F5F5F5"]},"bestText":{"text":"#FFFFFF","label":"white text","ratio":14.32},"description":"Ultramarine is #120A8F, a cool blue color with jewel tone character. Compared with Dark Blue, it is lighter and less saturated. Use it for historical references, pigment palettes, and cultural color systems, with white text as the safer foreground option.","url":"https://www.colorsencyclopedia.com/colors/ultramarine/","apiUrl":"https://www.colorsencyclopedia.com/api/colors/ultramarine.json"},{"slug":"dark-blue","name":"Dark Blue","hex":"#00008B","rgb":[0,0,139],"hsl":[240,100,27],"cmyk":[100,100,0,45],"family":"blue","temperature":"cool","tone":["jewel-tone"],"luminance":0.0186,"contrast":{"black":1.37,"white":15.31},"wcag":{"AA":["#FFFFFF","#F5F5F5"],"AAA":["#FFFFFF","#F5F5F5"]},"bestText":{"text":"#FFFFFF","label":"white text","ratio":15.31},"description":"Dark Blue is #00008B, a cool blue color with jewel tone character. Compared with Ultramarine, it is darker and more saturated. Use it for web design, css color systems, and ui prototyping, with white text as the safer foreground option.","url":"https://www.colorsencyclopedia.com/colors/dark-blue/","apiUrl":"https://www.colorsencyclopedia.com/api/colors/dark-blue.json"}],"differences":{"rgbDistance":21,"contrastRatio":1.07,"hslDelta":{"hue":4,"saturation":13,"lightness":3},"luminanceDelta":0.0047,"sameFamily":true,"sameTemperature":true,"sharedTones":["jewel-tone"],"lighterColor":"Ultramarine","moreSaturatedColor":"Dark Blue"},"accessibility":{"pairContrastRatio":1.07,"textRecommendation":"Do not use this pair for text; use it for neighboring palette colors, decoration, or low-emphasis surfaces.","safeText":[{"color":"Ultramarine","background":"#120A8F","foreground":"#FFFFFF","label":"white text","ratio":14.32},{"color":"Dark Blue","background":"#00008B","foreground":"#FFFFFF","label":"white text","ratio":15.31}]},"useCases":{"chooseFirstWhen":"Ultramarine is better when the design needs jewel tone blue character, cool temperature, and the specific HEX value #120A8F.","chooseSecondWhen":"Dark Blue is better when the design needs jewel tone blue character, cool temperature, and the specific HEX value #00008B.","useTogetherWhen":"Use these colors together as related palette neighbors, subtle material differences, or tonal alternatives rather than readable foreground/background pairs."},"relatedApi":["https://www.colorsencyclopedia.com/api/compare/ultramarine-vs-dark-blue.json","https://www.colorsencyclopedia.com/api/colors/ultramarine.json","https://www.colorsencyclopedia.com/api/colors/dark-blue.json"],"url":"https://www.colorsencyclopedia.com/compare/ultramarine-vs-dark-blue/","apiUrl":"https://www.colorsencyclopedia.com/api/compare/ultramarine-vs-dark-blue.json"}