#66709C
Closest named color: Dull Blue (#49759C). oklch(55.5% 0.07 274.1), rgb(102, 112, 156).
Aa
White text reads best on this color (4.81:1).
About this color
#66709C is a medium-dark, muted blue. In OKLCH its lightness is 55%, its chroma 0.070 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.037 away. White text reads best on it, at 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | muted (0.070) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.36:1 |
| White text | 4.81:1 |
Values
| HEX | #66709C |
| RGB | rgb(102, 112, 156) |
| HSL | hsl(229, 21%, 51%) |
| OKLCH | oklch(55.5% 0.07 274.1) |
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 #66709C | 4.81:1 | AA | Lc -78.8 | Fine for body text |
| Black text on #66709C | 4.36:1 | AA large text | Lc 30.7 | Non-text elements, placeholder text |
| #66709C text on white | 4.81:1 | AA | Lc 73.4 | Content text, not long reading |
| #66709C text on black | 4.36:1 | AA large text | Lc -28.3 | Dividers and decoration only |
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 600.
-
Step 50
50
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E8E9F0
oklch(93.5% 0.009 279.7)
-
Step 200
200
#D5D9E5
oklch(88.6% 0.017 271.2)
-
Step 300
300
#BAC0D5
oklch(81% 0.03 273)
-
Step 400
400
#969FC1
oklch(70.7% 0.051 273.4)
-
Step 500
500
#7D87B1
oklch(63.1% 0.064 274)
-
Step 600
600 (this color)
#66709C
oklch(55.5% 0.07 274.1)
-
Step 700
700
#555E86
oklch(49.1% 0.065 274)
-
Step 800
800
#464D6D
oklch(42.8% 0.054 274.4)
-
Step 900
900
#3A4058
oklch(37.6% 0.042 273.4)
-
Step 950
950
#222634
oklch(27.1% 0.027 272.1)
#66709C 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) | #62749E | 0.012 |
| Deuteranopia (no green cones) | #5E709B | 0.011 |
| Tritanopia (no blue cones) | #57787F | 0.062 |
| Achromatopsia (no color) | #727272 | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66709C
#66709C
oklch(55.5% 0.07 274.1)
- #807242
#807242
oklch(55.4% 0.069 93.6)
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 #66709C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.037
- Stormy Blue #507B9C ΔE 0.039
- Metallic Blue #4F738E ΔE 0.040
- Cerulean #457B9D ΔE 0.047
- Grey Purple #826D8C ΔE 0.047
- Grey Blue #647D8E ΔE 0.049
- Flat Blue #3C73A8 ΔE 0.050
- Muted Blue #3B719F ΔE 0.050
Use #66709C 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.