#6599C2
Closest named color: Faded Blue (#658CBB). oklch(66.3% 0.083 243.2), rgb(101, 153, 194).
Aa
Black text reads best on this color (6.88:1).
About this color
#6599C2 is a medium-light, moderately saturated blue. In OKLCH its lightness is 66%, its chroma 0.083 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.036 away. Black text reads best on it, at 6.88:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.88:1 |
| White text | 3.04:1 |
Values
| HEX | #6599C2 |
| RGB | rgb(101, 153, 194) |
| HSL | hsl(206, 43%, 58%) |
| OKLCH | oklch(66.3% 0.083 243.2) |
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 #6599C2 | 3.04:1 | AA large text | Lc -62.6 | Content text, not long reading |
| Black text on #6599C2 | 6.88:1 | AA | Lc 46.8 | Large or bold text, headings |
| #6599C2 text on white | 3.04:1 | AA large text | Lc 57.2 | Large or bold text, headings |
| #6599C2 text on black | 6.88:1 | AA | Lc -44.5 | Non-text elements, placeholder text |
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
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CDDBE7
oklch(88.4% 0.022 243.8)
-
Step 300
300
#ABC4D9
oklch(80.8% 0.04 243.6)
-
Step 400
400
#7EA6C6
oklch(70.8% 0.064 242.9)
-
Step 500
500 (this color)
#6599C2
oklch(66.3% 0.083 243.2)
-
Step 600
600
#4079A4
oklch(55.6% 0.09 243.2)
-
Step 700
700
#32668C
oklch(49.2% 0.083 242.7)
-
Step 800
800
#2A5372
oklch(42.7% 0.069 243.3)
-
Step 900
900
#27455C
oklch(37.8% 0.053 243)
-
Step 950
950
#172836
oklch(26.9% 0.035 244.4)
#6599C2 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) | #8899C4 | 0.042 |
| Deuteranopia (no green cones) | #7B8FC1 | 0.035 |
| Tritanopia (no blue cones) | #3AA3A7 | 0.068 |
| Achromatopsia (no color) | #949494 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6599C2
#6599C2
oklch(66.3% 0.083 243.2)
- #B7885C
#B7885C
oklch(66.2% 0.083 63.7)
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 #6599C2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.036
- Greyblue #77A1B5 ΔE 0.040
- Silver Lake Blue #778DA9 ΔE 0.044
- Blue Grey #758DA3 ΔE 0.050
- Cool Gray #8D99AE ΔE 0.055
- Bluey Grey #89A0B0 ΔE 0.057
- Bluegrey #85A3B2 ΔE 0.057
- Cadet Blue #5F9EA0 ΔE 0.059
Use #6599C2 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.