Sygen

Blue

#66A3FF

#66A3FF is a blue with high intensity, at step 400 of its 50–950 scale. Dark text on it has a contrast of 7.4:1. On white it reaches only 2.5:1, so use a darker shade for text.

Build a color system Shades Contrast
Blue#66A3FF
HWB, OKLab, LCH, Lab and Display P3

#66A3FF shades and tints

Eleven steps from 50 to 950 with #66A3FF kept exactly at step 400. Lightness steps are even to the eye, and intensity tapers toward the lightest and darkest steps.

Open in shade generator
  1. 50 F2F7FF
  2. 100 E0ECFF
  3. 200 C3DBFF
  4. 300 98C1FF
  5. 400 66A3FF
  6. 500 4B87E0
  7. 600 316BC1
  8. 700 1B52A2
  9. 800 063C83
  10. 900 002860
  11. 950 00163B

Tailwind CSS v4 theme

@theme {  --color-blue-50: #f2f7ff;  --color-blue-100: #e0ecff;  --color-blue-200: #c3dbff;  --color-blue-300: #98c1ff;  --color-blue-400: #66a3ff;  --color-blue-500: #4b87e0;  --color-blue-600: #316bc1;  --color-blue-700: #1b52a2;  --color-blue-800: #063c83;  --color-blue-900: #002860;  --color-blue-950: #00163b;}

Is #66A3FF readable?

Contrast for text on #66A3FF and for #66A3FF used as text. WCAG 2.2 asks for 4.5:1 for body text and 3:1 for large text; APCA Lc rates how comfortable the text is to read.

Color palettes with #66A3FF

Six palettes built around #66A3FF, each starting from the exact color. Open one in the palette tool to adjust it or get more options.

#66A3FF as a brand color

What a UI color system built from #66A3FF looks like: brand, neutral and status scales, with light and dark tokens that pass WCAG.

Open in builder

Brand

  1. Brand 50, #F2F7FF
  2. Brand 100, #E0ECFF
  3. Brand 200, #C3DBFF
  4. Brand 300, #98C1FF
  5. Brand 400, #66A3FF
  6. Brand 500, #4B87E0
  7. Brand 600, #316BC1
  8. Brand 700, #1B52A2
  9. Brand 800, #063C83
  10. Brand 900, #002860
  11. Brand 950, #00163B

Neutral

  1. Neutral 50, #F9FAFB
  2. Neutral 100, #F3F4F6
  3. Neutral 200, #E3E5E8
  4. Neutral 300, #D1D4D9
  5. Neutral 400, #9DA1A8
  6. Neutral 500, #6F747B
  7. Neutral 600, #50555C
  8. Neutral 700, #3C4147
  9. Neutral 800, #24282E
  10. Neutral 900, #14181D
  11. Neutral 950, #070A0F

Success

  1. Success 50, #E3FFEE
  2. Success 100, #B4FFD6
  3. Success 200, #8DF2BE
  4. Success 300, #67D9A2
  5. Success 400, #3ABE84
  6. Success 500, #00A96F
  7. Success 600, #008254
  8. Success 700, #006641
  9. Success 800, #004D30
  10. Success 900, #003520
  11. Success 950, #001F10

Warning

  1. Warning 50, #FFF5EB
  2. Warning 100, #FFE7CE
  3. Warning 200, #FFCF9D
  4. Warning 300, #FFAB43
  5. Warning 400, #F49900
  6. Warning 500, #BD7500
  7. Warning 600, #995E00
  8. Warning 700, #784900
  9. Warning 800, #5B3600
  10. Warning 900, #402400
  11. Warning 950, #261300

Danger

  1. Danger 50, #FFF4F3
  2. Danger 100, #FFE4E2
  3. Danger 200, #FFCAC7
  4. Danger 300, #FFA29F
  5. Danger 400, #FF6D6F
  6. Danger 500, #E82D41
  7. Danger 600, #CD002D
  8. Danger 700, #A20022
  9. Danger 800, #7C0017
  10. Danger 900, #58000E
  11. Danger 950, #360005

Info

  1. Info 50, #F1F8FF
  2. Info 100, #DDEDFF
  3. Info 200, #BEDCFF
  4. Info 300, #8FC4FF
  5. Info 400, #53A7FF
  6. Info 500, #2B87E0
  7. Info 600, #026EC4
  8. Info 700, #00569C
  9. Info 800, #004077
  10. Info 900, #002C54
  11. Info 950, #001934
  • Primary buttons use Brand 400 with neutral 950 text, at 7.8:1.
  • In dark mode primary stays Brand 400: it already reads on the dark background at 7.8:1.
  • Neutrals carry a hint of its hue, so grays, borders and surfaces feel related to the brand.
  • Success, warning, danger and info lean toward its hue and stay easy to tell apart.

Colors related to #66A3FF

Lighter and darker versions, its complementary color, neighbors on the color wheel and softer variants.