#6599DD
Closest named color: Cornflower Blue (#6495ED). oklch(67.5% 0.116 255.6), rgb(101, 153, 221).
Aa
Black text reads best on this color (7.15:1).
About this color
#6599DD is a medium-light, moderately saturated blue. In OKLCH its lightness is 68%, its chroma 0.116 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.029 away. Black text reads best on it, at 7.15:1.
| Hue family | Blues |
| Lightness | medium-light (68%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.15:1 |
| White text | 2.93:1 |
Values
| HEX | #6599DD |
| RGB | rgb(101, 153, 221) |
| HSL | hsl(214, 64%, 63%) |
| OKLCH | oklch(67.5% 0.116 255.6) |
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 #6599DD | 2.93:1 | Fails | Lc -61.0 | Content text, not long reading |
| Black text on #6599DD | 7.15:1 | AAA | Lc 48.4 | Large or bold text, headings |
| #6599DD text on white | 2.93:1 | Fails | Lc 55.7 | Large or bold text, headings |
| #6599DD text on black | 7.15:1 | 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)
#6599DD
oklch(67.5% 0.116 255.6)
-
Step 500
500
#468AE1
oklch(63.1% 0.149 255.7)
-
Step 600
600
#2572CF
oklch(55.6% 0.162 255.7)
-
Step 700
700
#175FB3
oklch(49.1% 0.15 255.7)
-
Step 800
800
#164E91
oklch(42.7% 0.124 255.6)
-
Step 900
900
#1A4273
oklch(37.8% 0.095 255.2)
-
Step 950
950
#102744
oklch(27.1% 0.062 255.3)
#6599DD 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) | #7E9DE0 | 0.032 |
| Deuteranopia (no green cones) | #6E91DC | 0.022 |
| Tritanopia (no blue cones) | #19A8B1 | 0.102 |
| Achromatopsia (no color) | #979797 | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6599DD
#6599DD
oklch(67.5% 0.116 255.6)
- #C08C3A
#C08C3A
oklch(67.6% 0.116 75.6)
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 #6599DD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.029
- Chefchaouen Blue #4895EF ΔE 0.041
- Dark Sky Blue #448EE4 ΔE 0.048
- Soft Blue #6488EA ΔE 0.054
- Faded Blue #658CBB ΔE 0.055
- Perrywinkle #8F8CE7 ΔE 0.063
- Periwinkle Blue #8F99FB ΔE 0.070
- Greyblue #77A1B5 ΔE 0.072
Use #6599DD 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.