Sygen

Blue

#21578E

#21578E is a blue with medium intensity, at step 700 of its 50–950 scale. White text on it has a contrast of 7.5:1. It is readable as text on white (7.5:1).

Build a color system Shades Contrast
Blue#21578E
HWB, OKLab, LCH, Lab and Display P3

#21578E shades and tints

Eleven steps from 50 to 950 with #21578E kept exactly at step 700. Lightness steps are even to the eye, and intensity tapers toward the lightest and darkest steps.

Open in shade generator
  1. 50 F1F8FF
  2. 100 DDEDFF
  3. 200 BEDCFF
  4. 300 91C4FC
  5. 400 72A7E2
  6. 500 558BC6
  7. 600 3B70A8
  8. 700 21578E
  9. 800 12416F
  10. 900 022C53
  11. 950 001934

Tailwind CSS v4 theme

@theme {  --color-blue-50: #f1f8ff;  --color-blue-100: #ddedff;  --color-blue-200: #bedcff;  --color-blue-300: #91c4fc;  --color-blue-400: #72a7e2;  --color-blue-500: #558bc6;  --color-blue-600: #3b70a8;  --color-blue-700: #21578e;  --color-blue-800: #12416f;  --color-blue-900: #022c53;  --color-blue-950: #001934;}

Is #21578E readable?

Contrast for text on #21578E and for #21578E 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 #21578E

Six palettes built around #21578E, each starting from the exact color. Open one in the palette tool to adjust it or get more options.

#21578E as a brand color

What a UI color system built from #21578E looks like: brand, neutral and status scales, with light and dark tokens that pass WCAG.

Open in builder

Brand

  1. Brand 50, #F1F8FF
  2. Brand 100, #DDEDFF
  3. Brand 200, #BEDCFF
  4. Brand 300, #91C4FC
  5. Brand 400, #72A7E2
  6. Brand 500, #558BC6
  7. Brand 600, #3B70A8
  8. Brand 700, #21578E
  9. Brand 800, #12416F
  10. Brand 900, #022C53
  11. Brand 950, #001934

Neutral

  1. Neutral 50, #F9FAFB
  2. Neutral 100, #F3F4F6
  3. Neutral 200, #E3E5E8
  4. Neutral 300, #D1D5D9
  5. Neutral 400, #9CA1A8
  6. Neutral 500, #6E747B
  7. Neutral 600, #4F555C
  8. Neutral 700, #3B4147
  9. Neutral 800, #24282E
  10. Neutral 900, #14181D
  11. Neutral 950, #070A0F

Success

  1. Success 50, #E3FFEE
  2. Success 100, #B4FFD6
  3. Success 200, #9AEFC1
  4. Success 300, #77D6A6
  5. Success 400, #51BB88
  6. Success 500, #1D9765
  7. Success 600, #008254
  8. Success 700, #006641
  9. Success 800, #004D30
  10. Success 900, #003520
  11. Success 950, #001F10

Warning

  1. Warning 50, #FFF6E5
  2. Warning 100, #FFE8C0
  3. Warning 200, #FCD387
  4. Warning 300, #E5B863
  5. Warning 400, #D3A23F
  6. Warning 500, #AE7F06
  7. Warning 600, #8D6600
  8. Warning 700, #6F4F00
  9. Warning 800, #543B00
  10. Warning 900, #3A2800
  11. Warning 950, #221600

Danger

  1. Danger 50, #FFF4F3
  2. Danger 100, #FFE4E2
  3. Danger 200, #FFCAC7
  4. Danger 300, #FFA29F
  5. Danger 400, #F77575
  6. Danger 500, #D95659
  7. Danger 600, #C03F44
  8. Danger 700, #991F2A
  9. Danger 800, #7B0419
  10. Danger 900, #58000E
  11. Danger 950, #360005

Info

  1. Info 50, #F1F8FF
  2. Info 100, #DCEDFF
  3. Info 200, #BBDDFF
  4. Info 300, #89C5FF
  5. Info 400, #65A9E8
  6. Info 500, #478DCC
  7. Info 600, #3279B8
  8. Info 700, #105891
  9. Info 800, #004272
  10. Info 900, #002D50
  11. Info 950, #001931
  • Primary buttons use Brand 700 with white text, at 7.5:1.
  • In dark mode primary lifts to Brand 500 so it reads on the dark background, at 5.6:1.
  • 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 #21578E

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