#405B66
Closest named color: YInMn Blue (#415A77). oklch(45.4% 0.037 225.1), rgb(64, 91, 102).
Aa
White text reads best on this color (7.22:1).
About this color
#405B66 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 45%, its chroma 0.037 and its hue 225°. Its hue sits on the cool side of the wheel. The nearest named color is YInMn Blue (#415A77), ΔE 0.030 away. White text reads best on it, at 7.22:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (45%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | YInMn Blue (#415A77) |
| Black text | 2.90:1 |
| White text | 7.22:1 |
Values
| HEX | #405B66 |
| RGB | rgb(64, 91, 102) |
| HSL | hsl(197, 23%, 33%) |
| OKLCH | oklch(45.4% 0.037 225.1) |
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 #405B66 | 7.22:1 | AAA | Lc -89.9 | Fine for body text |
| Black text on #405B66 | 2.90:1 | Fails | Lc 19.0 | Dividers and decoration only |
| #405B66 text on white | 7.22:1 | AAA | Lc 85.1 | Fine for body text |
| #405B66 text on black | 2.90:1 | Fails | Lc -17.0 | 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 800.
-
Step 50
50
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E6EBED
oklch(93.7% 0.006 223.5)
-
Step 200
200
#D1DBDF
oklch(88.5% 0.012 223.5)
-
Step 300
300
#B3C4CB
oklch(80.9% 0.021 224.4)
-
Step 400
400
#8AA6B1
oklch(70.8% 0.035 223.6)
-
Step 500
500
#6D909E
oklch(63.2% 0.044 224.4)
-
Step 600
600
#547A89
oklch(55.7% 0.049 224.6)
-
Step 700
700
#456674
oklch(49% 0.044 226.4)
-
Step 800
800 (this color)
#405B66
oklch(45.4% 0.037 225.1)
-
Step 900
900
#31454D
oklch(37.7% 0.029 224.6)
-
Step 950
950
#1D282D
oklch(26.9% 0.018 227.5)
#405B66 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) | #555A67 | 0.029 |
| Deuteranopia (no green cones) | #4F5566 | 0.026 |
| Tritanopia (no blue cones) | #335E5E | 0.024 |
| Achromatopsia (no color) | #575757 | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #405B66
#405B66
oklch(45.4% 0.037 225.1)
- #685045
#685045
oklch(45.3% 0.037 45.8)
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 #405B66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- YInMn Blue #415A77 ΔE 0.030
- Slate #516572 ΔE 0.042
- Dusty Grape #545775 ΔE 0.043
- Petrol #005F6A ΔE 0.044
- Dark Green Blue #1F6357 ΔE 0.052
- Dark Aqua #05696B ΔE 0.053
- Dark Slate Gray #2F4F4F ΔE 0.054
- Dusk #4E5481 ΔE 0.059
Use #405B66 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.