#6599DF
Closest named color: Cornflower Blue (#6495ED). oklch(67.6% 0.118 256.2), rgb(101, 153, 223).
Aa
Black text reads best on this color (7.17:1).
About this color
#6599DF is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.118 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.026 away. Black text reads best on it, at 7.17:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.17:1 |
| White text | 2.92:1 |
Values
| HEX | #6599DF |
| RGB | rgb(101, 153, 223) |
| HSL | hsl(214, 66%, 64%) |
| OKLCH | oklch(67.6% 0.118 256.2) |
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 #6599DF | 2.92:1 | Fails | Lc -60.9 | Content text, not long reading |
| Black text on #6599DF | 7.17:1 | AAA | Lc 48.5 | Large or bold text, headings |
| #6599DF text on white | 2.92:1 | Fails | Lc 55.5 | Large or bold text, headings |
| #6599DF text on black | 7.17:1 | AAA | Lc -46.3 | 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
#C8DBF5
oklch(88.5% 0.041 256.2)
-
Step 300
300
#A2C3F0
oklch(80.9% 0.073 256.2)
-
Step 400
400 (this color)
#6599DF
oklch(67.6% 0.118 256.2)
-
Step 500
500
#468AE3
oklch(63.2% 0.151 256.1)
-
Step 600
600
#2571D1
oklch(55.5% 0.165 256.5)
-
Step 700
700
#165FB5
oklch(49.2% 0.153 256)
-
Step 800
800
#164E92
oklch(42.8% 0.126 255.9)
-
Step 900
900
#1A4175
oklch(37.7% 0.099 256.7)
-
Step 950
950
#102744
oklch(27.1% 0.062 255.3)
#6599DF 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) | #7D9DE2 | 0.031 |
| Deuteranopia (no green cones) | #6D92DE | 0.019 |
| Tritanopia (no blue cones) | #14A9B2 | 0.105 |
| Achromatopsia (no color) | #979797 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6599DF
#6599DF
oklch(67.6% 0.118 256.2)
- #C08C37
#C08C37
oklch(67.5% 0.118 76.3)
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 #6599DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.026
- Chefchaouen Blue #4895EF ΔE 0.039
- Dark Sky Blue #448EE4 ΔE 0.047
- Soft Blue #6488EA ΔE 0.052
- Faded Blue #658CBB ΔE 0.058
- Perrywinkle #8F8CE7 ΔE 0.062
- Periwinkle Blue #8F99FB ΔE 0.067
- Greyblue #77A1B5 ΔE 0.075
Use #6599DF 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.