#6599CC
Closest named color: Faded Blue (#658CBB). oklch(66.7% 0.094 248.9), rgb(101, 153, 204).
Aa
Black text reads best on this color (6.98:1).
About this color
#6599CC is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.094 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.039 away. Black text reads best on it, at 6.98:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.094) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.98:1 |
| White text | 3.00:1 |
Values
| HEX | #6599CC |
| RGB | rgb(101, 153, 204) |
| HSL | hsl(210, 50%, 60%) |
| OKLCH | oklch(66.7% 0.094 248.9) |
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 #6599CC | 3.00:1 | AA large text | Lc -62.0 | Content text, not long reading |
| Black text on #6599CC | 6.98:1 | AA | Lc 47.4 | Large or bold text, headings |
| #6599CC text on white | 3.00:1 | AA large text | Lc 56.7 | Large or bold text, headings |
| #6599CC text on black | 6.98:1 | AA | Lc -45.1 | 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 500.
-
Step 50
50
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CDDBEA
oklch(88.5% 0.026 250)
-
Step 300
300
#AAC4DE
oklch(80.9% 0.046 248.4)
-
Step 400
400
#7DA5CD
oklch(70.8% 0.073 248.9)
-
Step 500
500 (this color)
#6599CC
oklch(66.7% 0.094 248.9)
-
Step 600
600
#3F77AD
oklch(55.6% 0.103 249.4)
-
Step 700
700
#306494
oklch(49% 0.095 248.7)
-
Step 800
800
#295278
oklch(42.7% 0.079 248.5)
-
Step 900
900
#264461
oklch(37.7% 0.062 249)
-
Step 950
950
#172839
oklch(27.1% 0.039 249.5)
#6599CC 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) | #849ACE | 0.037 |
| Deuteranopia (no green cones) | #7790CB | 0.030 |
| Tritanopia (no blue cones) | #31A5AA | 0.082 |
| Achromatopsia (no color) | #959595 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6599CC
#6599CC
oklch(66.7% 0.094 248.9)
- #BA8951
#BA8951
oklch(66.6% 0.094 68.7)
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 #6599CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.039
- Greyblue #77A1B5 ΔE 0.051
- Cornflower Blue #6495ED ΔE 0.054
- Silver Lake Blue #778DA9 ΔE 0.055
- Chefchaouen Blue #4895EF ΔE 0.061
- Dark Sky Blue #448EE4 ΔE 0.062
- Blue Grey #758DA3 ΔE 0.062
- Cool Gray #8D99AE ΔE 0.063
Use #6599CC 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.