#639DFD
Closest named color: Cornflower Blue (#6495ED). oklch(70% 0.154 260), rgb(99, 157, 253).
Aa
Black text reads best on this color (7.77:1).
About this color
#639DFD is a medium-light, vivid blue. In OKLCH its lightness is 70%, its chroma 0.154 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.028 away. Black text reads best on it, at 7.77:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.77:1 |
| White text | 2.70:1 |
Values
| HEX | #639DFD |
| RGB | rgb(99, 157, 253) |
| HSL | hsl(217, 97%, 69%) |
| OKLCH | oklch(70% 0.154 260) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #639DFD | 2.70:1 | Fails | Lc -57.4 | Large or bold text, headings |
| Black text on #639DFD | 7.77:1 | AAA | Lc 51.9 | Large or bold text, headings |
| #639DFD text on white | 2.70:1 | Fails | Lc 52.2 | Large or bold text, headings |
| #639DFD text on black | 7.77:1 | AAA | Lc -49.7 | Large or bold text, headings |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 400.
-
Step 50
50
#F0F6FE
oklch(97.1% 0.012 255.5)
-
Step 100
100
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C5DAFD
oklch(88.4% 0.054 260.6)
-
Step 300
300
#9CC2FF
oklch(80.9% 0.096 259.7)
-
Step 400
400 (this color)
#639DFD
oklch(70% 0.154 260)
-
Step 500
500
#3983FE
oklch(63% 0.198 260.1)
-
Step 600
600
#1269ED
oklch(55.6% 0.214 260)
-
Step 700
700
#0156CF
oklch(49.1% 0.2 260.1)
-
Step 800
800
#0847A7
oklch(42.6% 0.166 260.1)
-
Step 900
900
#123D84
oklch(37.6% 0.129 260.1)
-
Step 950
950
#0C254D
oklch(27.1% 0.08 259.5)
#639DFD with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #73A5FF | 0.029 |
| Deuteranopia (no green cones) | #5E97FB | 0.017 |
| Tritanopia (no blue cones) | #00B3C1 | 0.131 |
| Achromatopsia (no color) | #9D9D9D | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #639DFD
#639DFD
oklch(70% 0.154 260)
- #CD9200
#CD9200
oklch(69.9% 0.145 79.8)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #639DFD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.028
- Chefchaouen Blue #4895EF ΔE 0.040
- Periwinkle Blue #8F99FB ΔE 0.050
- Soft Blue #6488EA ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.062
- Dodger Blue #1E90FF ΔE 0.063
- Lavender Blue #8B88F8 ΔE 0.065
- Perrywinkle #8F8CE7 ΔE 0.066
Use #639DFD in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.