#6599D2
Closest named color: Faded Blue (#658CBB). oklch(67% 0.102 251.7), rgb(101, 153, 210).
Aa
Black text reads best on this color (7.04:1).
About this color
#6599D2 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.102 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.044 away. Black text reads best on it, at 7.04:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 7.04:1 |
| White text | 2.98:1 |
Values
| HEX | #6599D2 |
| RGB | rgb(101, 153, 210) |
| HSL | hsl(211, 55%, 61%) |
| OKLCH | oklch(67% 0.102 251.7) |
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 #6599D2 | 2.98:1 | Fails | Lc -61.7 | Content text, not long reading |
| Black text on #6599D2 | 7.04:1 | AAA | Lc 47.7 | Large or bold text, headings |
| #6599D2 text on white | 2.98:1 | Fails | Lc 56.3 | Large or bold text, headings |
| #6599D2 text on black | 7.04:1 | AAA | Lc -45.5 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E1EBF6
oklch(93.6% 0.018 250.6)
-
Step 200
200
#C9DBF0
oklch(88.4% 0.035 252.3)
-
Step 300
300
#A3C4E9
oklch(80.9% 0.064 251.5)
-
Step 400
400 (this color)
#6599D2
oklch(67% 0.102 251.7)
-
Step 500
500
#488DD5
oklch(63.1% 0.13 251.5)
-
Step 600
600
#2675C3
oklch(55.5% 0.142 251.9)
-
Step 700
700
#1862A8
oklch(49% 0.132 251.8)
-
Step 800
800
#175088
oklch(42.6% 0.109 251.8)
-
Step 900
900
#1B436D
oklch(37.7% 0.085 252)
-
Step 950
950
#112840
oklch(27.1% 0.054 251.3)
#6599D2 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) | #829BD5 | 0.035 |
| Deuteranopia (no green cones) | #7491D1 | 0.025 |
| Tritanopia (no blue cones) | #2BA6AD | 0.088 |
| Achromatopsia (no color) | #959595 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6599D2
#6599D2
oklch(67% 0.102 251.7)
- #BC8A4A
#BC8A4A
oklch(66.9% 0.102 71.3)
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 #6599D2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.044
- Cornflower Blue #6495ED ΔE 0.045
- Chefchaouen Blue #4895EF ΔE 0.053
- Dark Sky Blue #448EE4 ΔE 0.056
- Greyblue #77A1B5 ΔE 0.058
- Silver Lake Blue #778DA9 ΔE 0.062
- Soft Blue #6488EA ΔE 0.065
- Cool Gray #8D99AE ΔE 0.069
Use #6599D2 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.