#6599CF
Closest named color: Faded Blue (#658CBB). oklch(66.8% 0.098 250.4), rgb(101, 153, 207).
Aa
Black text reads best on this color (7.01:1).
About this color
#6599CF is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.098 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.041 away. Black text reads best on it, at 7.01:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 7.01:1 |
| White text | 2.99:1 |
Values
| HEX | #6599CF |
| RGB | rgb(101, 153, 207) |
| HSL | hsl(211, 52%, 60%) |
| OKLCH | oklch(66.8% 0.098 250.4) |
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 #6599CF | 2.99:1 | Fails | Lc -61.8 | Content text, not long reading |
| Black text on #6599CF | 7.01:1 | AAA | Lc 47.6 | Large or bold text, headings |
| #6599CF text on white | 2.99:1 | Fails | Lc 56.5 | Large or bold text, headings |
| #6599CF text on black | 7.01:1 | AAA | Lc -45.3 | 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 500.
-
Step 50
50
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CCDBEB
oklch(88.5% 0.027 249.9)
-
Step 300
300
#AAC4DF
oklch(81% 0.048 249.4)
-
Step 400
400
#7CA5CF
oklch(70.8% 0.076 249.5)
-
Step 500
500 (this color)
#6599CF
oklch(66.8% 0.098 250.4)
-
Step 600
600
#3E77AF
oklch(55.6% 0.106 249.9)
-
Step 700
700
#306497
oklch(49.2% 0.099 250.1)
-
Step 800
800
#29517A
oklch(42.6% 0.082 250.8)
-
Step 900
900
#264462
oklch(37.8% 0.063 249.8)
-
Step 950
950
#17283A
oklch(27.1% 0.041 250.8)
#6599CF 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) | #839BD1 | 0.036 |
| Deuteranopia (no green cones) | #7690CE | 0.029 |
| Tritanopia (no blue cones) | #2EA5AC | 0.084 |
| Achromatopsia (no color) | #959595 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6599CF
#6599CF
oklch(66.8% 0.098 250.4)
- #BB8A4E
#BB8A4E
oklch(66.9% 0.098 70.4)
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 #6599CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.041
- Cornflower Blue #6495ED ΔE 0.049
- Greyblue #77A1B5 ΔE 0.054
- Chefchaouen Blue #4895EF ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.059
- Silver Lake Blue #778DA9 ΔE 0.059
- Blue Grey #758DA3 ΔE 0.066
- Cool Gray #8D99AE ΔE 0.066
Use #6599CF 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.