#66A4CD
Closest named color: Greyblue (#77A1B5). oklch(69.3% 0.088 238.8), rgb(102, 164, 205).
Aa
Black text reads best on this color (7.75:1).
About this color
#66A4CD is a medium-light, moderately saturated blue. In OKLCH its lightness is 69%, its chroma 0.088 and its hue 239°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.037 away. Black text reads best on it, at 7.75:1.
| Hue family | Blues |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.75:1 |
| White text | 2.70:1 |
Values
| HEX | #66A4CD |
| RGB | rgb(102, 164, 205) |
| HSL | hsl(204, 51%, 60%) |
| OKLCH | oklch(69.3% 0.088 238.8) |
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 #66A4CD | 2.70:1 | Fails | Lc -57.6 | Large or bold text, headings |
| Black text on #66A4CD | 7.75:1 | AAA | Lc 51.7 | Large or bold text, headings |
| #66A4CD text on white | 2.70:1 | Fails | Lc 52.4 | Large or bold text, headings |
| #66A4CD text on black | 7.75:1 | AAA | Lc -49.5 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1ECF4
oklch(93.7% 0.016 239.1)
-
Step 200
200
#C7DDEC
oklch(88.6% 0.031 237.6)
-
Step 300
300
#A0C6E1
oklch(80.8% 0.056 239.3)
-
Step 400
400 (this color)
#66A4CD
oklch(69.3% 0.088 238.8)
-
Step 500
500
#3C92C6
oklch(63.1% 0.113 238.9)
-
Step 600
600
#097BB2
oklch(55.5% 0.122 238.9)
-
Step 700
700
#006898
oklch(49.2% 0.11 238.7)
-
Step 800
800
#04557C
oklch(42.7% 0.094 238.4)
-
Step 900
900
#124664
oklch(37.6% 0.074 239)
-
Step 950
950
#0D293B
oklch(26.9% 0.047 240.1)
#66A4CD 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) | #92A3CF | 0.051 |
| Deuteranopia (no green cones) | #8498CC | 0.044 |
| Tritanopia (no blue cones) | #30AEB2 | 0.069 |
| Achromatopsia (no color) | #9D9D9D | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66A4CD
#66A4CD
oklch(69.3% 0.088 238.8)
- #C58F64
#C58F64
oklch(69.3% 0.088 59.2)
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 #66A4CD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.037
- Bluegrey #85A3B2 ΔE 0.050
- Bluey Grey #89A0B0 ΔE 0.053
- Cool Gray #8D99AE ΔE 0.060
- Turquoise Blue #06B1C4 ΔE 0.062
- Faded Blue #658CBB ΔE 0.066
- Cadet Blue #5F9EA0 ΔE 0.067
- Cool Steel #97A7B3 ΔE 0.069
Use #66A4CD 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.