#66859E
Closest named color: Steel (#738595). oklch(60.2% 0.052 243.1), rgb(102, 133, 158).
Aa
Black text reads best on this color (5.41:1).
About this color
#66859E is a medium-dark, muted blue. In OKLCH its lightness is 60%, its chroma 0.052 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Steel (#738595), ΔE 0.021 away. Black text reads best on it, at 5.41:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | muted (0.052) |
| Temperature | cool |
| Nearest name | Steel (#738595) |
| Black text | 5.41:1 |
| White text | 3.87:1 |
Values
| HEX | #66859E |
| RGB | rgb(102, 133, 158) |
| HSL | hsl(207, 22%, 51%) |
| OKLCH | oklch(60.2% 0.052 243.1) |
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 #66859E | 3.87:1 | AA large text | Lc -71.7 | Content text, not long reading |
| Black text on #66859E | 5.41:1 | AA | Lc 37.9 | Non-text elements, placeholder text |
| #66859E text on white | 3.87:1 | AA large text | Lc 66.2 | Content text, not long reading |
| #66859E text on black | 5.41:1 | AA | Lc -35.4 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E6EAEE
oklch(93.5% 0.007 247.9)
-
Step 200
200
#D1DAE2
oklch(88.4% 0.015 244.7)
-
Step 300
300
#B3C3D0
oklch(80.9% 0.025 242.4)
-
Step 400
400
#8BA4B8
oklch(70.6% 0.041 242.4)
-
Step 500
500 (this color)
#66859E
oklch(60.2% 0.052 243.1)
-
Step 600
600
#567892
oklch(55.7% 0.056 241.9)
-
Step 700
700
#46647C
oklch(49% 0.052 243.2)
-
Step 800
800
#3A5265
oklch(42.7% 0.043 242.8)
-
Step 900
900
#324452
oklch(37.7% 0.033 242.1)
-
Step 950
950
#1D2830
oklch(27% 0.021 240.1)
#66859E 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) | #7B859F | 0.028 |
| Deuteranopia (no green cones) | #737F9E | 0.023 |
| Tritanopia (no blue cones) | #548B8D | 0.042 |
| Achromatopsia (no color) | #818181 | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66859E
#66859E
oklch(60.2% 0.052 243.1)
- #987B61
#987B61
oklch(60.4% 0.052 63.5)
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 #66859E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel #738595 ΔE 0.021
- Slate Gray #708090 ΔE 0.024
- Dusty Blue #5A86AD ΔE 0.025
- Light Slate Gray #778899 ΔE 0.026
- Grey Blue #647D8E ΔE 0.029
- Steel Grey #6F828A ΔE 0.030
- Off Blue #5684AE ΔE 0.031
- Blue Grey #758DA3 ΔE 0.032
Use #66859E 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.