#6599DC
Closest named color: Cornflower Blue (#6495ED). oklch(67.5% 0.114 255.3), rgb(101, 153, 220).
Aa
Black text reads best on this color (7.14:1).
About this color
#6599DC is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.114 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.030 away. Black text reads best on it, at 7.14:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.14:1 |
| White text | 2.93:1 |
Values
| HEX | #6599DC |
| RGB | rgb(101, 153, 220) |
| HSL | hsl(214, 63%, 63%) |
| OKLCH | oklch(67.5% 0.114 255.3) |
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 #6599DC | 2.93:1 | Fails | Lc -61.1 | Content text, not long reading |
| Black text on #6599DC | 7.14:1 | AAA | Lc 48.3 | Large or bold text, headings |
| #6599DC text on white | 2.93:1 | Fails | Lc 55.7 | Large or bold text, headings |
| #6599DC text on black | 7.14:1 | AAA | Lc -46.1 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF4
oklch(88.5% 0.04 255.3)
-
Step 300
300
#A2C3EF
oklch(80.8% 0.072 255.7)
-
Step 400
400 (this color)
#6599DC
oklch(67.5% 0.114 255.3)
-
Step 500
500
#468AE0
oklch(63% 0.147 255.5)
-
Step 600
600
#2572CD
oklch(55.5% 0.159 255.4)
-
Step 700
700
#175FB2
oklch(49% 0.149 255.5)
-
Step 800
800
#164E90
oklch(42.6% 0.123 255.4)
-
Step 900
900
#1A4273
oklch(37.8% 0.095 255.2)
-
Step 950
950
#102743
oklch(27% 0.06 254.6)
#6599DC 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) | #7E9DDF | 0.032 |
| Deuteranopia (no green cones) | #6F91DB | 0.023 |
| Tritanopia (no blue cones) | #1BA8B1 | 0.101 |
| Achromatopsia (no color) | #969696 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6599DC
#6599DC
oklch(67.5% 0.114 255.3)
- #BF8C3C
#BF8C3C
oklch(67.5% 0.114 75.7)
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 #6599DC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.030
- Chefchaouen Blue #4895EF ΔE 0.042
- Dark Sky Blue #448EE4 ΔE 0.049
- Faded Blue #658CBB ΔE 0.054
- Soft Blue #6488EA ΔE 0.055
- Perrywinkle #8F8CE7 ΔE 0.064
- Periwinkle Blue #8F99FB ΔE 0.071
- Greyblue #77A1B5 ΔE 0.071
Use #6599DC 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.