Sygen

Sky blue

#639DBD

#639DBD is a sky blue with medium intensity, at step 500 of its 50–950 scale. Dark text on it has a contrast of 6.4:1. On white it reaches only 3.0:1, so use a darker shade for text.

Build a color system Shades Contrast
Sky blue#639DBD
HWB, OKLab, LCH, Lab and Display P3

#639DBD shades and tints

Eleven steps from 50 to 950 with #639DBD kept exactly at step 500. Lightness steps are even to the eye, and intensity tapers toward the lightest and darkest steps.

Open in shade generator
  1. 50 EEF9FF
  2. 100 D6F0FF
  3. 200 B0E1FD
  4. 300 92C8E6
  5. 400 73ABCB
  6. 500 639DBD
  7. 600 3B7593
  8. 700 255C78
  9. 800 10455E
  10. 900 003045
  11. 950 001B29

Tailwind CSS v4 theme

@theme {  --color-sky-blue-50: #eef9ff;  --color-sky-blue-100: #d6f0ff;  --color-sky-blue-200: #b0e1fd;  --color-sky-blue-300: #92c8e6;  --color-sky-blue-400: #73abcb;  --color-sky-blue-500: #639dbd;  --color-sky-blue-600: #3b7593;  --color-sky-blue-700: #255c78;  --color-sky-blue-800: #10455e;  --color-sky-blue-900: #003045;  --color-sky-blue-950: #001b29;}

Is #639DBD readable?

Contrast for text on #639DBD and for #639DBD 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 #639DBD

Six palettes built around #639DBD, each starting from the exact color. Open one in the palette tool to adjust it or get more options.

#639DBD as a brand color

What a UI color system built from #639DBD looks like: brand, neutral and status scales, with light and dark tokens that pass WCAG.

Open in builder

Brand

  1. Brand 50, #EEF9FF
  2. Brand 100, #D6F0FF
  3. Brand 200, #B0E1FD
  4. Brand 300, #92C8E6
  5. Brand 400, #73ABCB
  6. Brand 500, #639DBD
  7. Brand 600, #3B7593
  8. Brand 700, #255C78
  9. Brand 800, #10455E
  10. Brand 900, #003045
  11. Brand 950, #001B29

Neutral

  1. Neutral 50, #F9FAFB
  2. Neutral 100, #F2F4F6
  3. Neutral 200, #E2E6E8
  4. Neutral 300, #D0D5D8
  5. Neutral 400, #9AA2A7
  6. Neutral 500, #6C757A
  7. Neutral 600, #4D565B
  8. Neutral 700, #3A4246
  9. Neutral 800, #22292D
  10. Neutral 900, #12191D
  11. Neutral 950, #060B0E

Success

  1. Success 50, #E3FFEE
  2. Success 100, #B4FFD6
  3. Success 200, #9AEFC1
  4. Success 300, #77D6A6
  5. Success 400, #51BB88
  6. Success 500, #2FA370
  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, #D6A542
  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, #D04D51
  7. Danger 600, #B93A40
  8. Danger 700, #991F2A
  9. Danger 800, #7B0419
  10. Danger 900, #58000E
  11. Danger 950, #360005

Info

  1. Info 50, #EFF8FF
  2. Info 100, #D8EFFF
  3. Info 200, #B4E0FF
  4. Info 300, #7AC9FE
  5. Info 400, #56ACE4
  6. Info 500, #2B8AC2
  7. Info 600, #0975AA
  8. Info 700, #005B87
  9. Info 800, #004567
  10. Info 900, #002F48
  11. Info 950, #001B2C
  • Primary buttons use Brand 500 with neutral 950 text, at 6.7:1.
  • In dark mode primary stays Brand 500: it already reads on the dark background at 6.7:1.
  • 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 #639DBD

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