#425F66
Closest named color: Slate (#516572). oklch(46.5% 0.036 214.4), rgb(66, 95, 102).
Aa
White text reads best on this color (6.86:1).
About this color
#425F66 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 47%, its chroma 0.036 and its hue 214°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.033 away. White text reads best on it, at 6.86:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (47%) |
| Chroma | muted (0.036) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.06:1 |
| White text | 6.86:1 |
Values
| HEX | #425F66 |
| RGB | rgb(66, 95, 102) |
| HSL | hsl(192, 21%, 33%) |
| OKLCH | oklch(46.5% 0.036 214.4) |
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 #425F66 | 6.86:1 | AA | Lc -88.7 | Fine for body text |
| Black text on #425F66 | 3.06:1 | AA large text | Lc 20.4 | Dividers and decoration only |
| #425F66 text on white | 6.86:1 | AA | Lc 83.7 | Fine for body text |
| #425F66 text on black | 3.06:1 | AA large text | Lc -18.3 | 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 700.
-
Step 50
50
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E6EBEC
oklch(93.7% 0.006 211)
-
Step 200
200
#D2DBDD
oklch(88.5% 0.01 212.5)
-
Step 300
300
#B5C4C7
oklch(81% 0.017 211)
-
Step 400
400
#8EA5AB
oklch(70.6% 0.027 215.2)
-
Step 500
500
#718F97
oklch(63% 0.036 215.8)
-
Step 600
600
#597A81
oklch(55.7% 0.039 212.2)
-
Step 700
700 (this color)
#425F66
oklch(46.5% 0.036 214.4)
-
Step 800
800
#3C5359
oklch(42.6% 0.03 215.6)
-
Step 900
900
#344549
oklch(37.7% 0.023 213.7)
-
Step 950
950
#1E282B
oklch(26.9% 0.015 218)
#425F66 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) | #5A5D66 | 0.033 |
| Deuteranopia (no green cones) | #545866 | 0.031 |
| Tritanopia (no blue cones) | #356261 | 0.021 |
| Achromatopsia (no color) | #5A5A5A | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #425F66
#425F66
oklch(46.5% 0.036 214.4)
- #6C534C
#6C534C
oklch(46.6% 0.035 36.2)
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 #425F66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.033
- YInMn Blue #415A77 ΔE 0.036
- Petrol #005F6A ΔE 0.046
- Dark Aqua #05696B ΔE 0.047
- Dusty Grape #545775 ΔE 0.047
- Dark Green Blue #1F6357 ΔE 0.047
- Denim #3B638C ΔE 0.060
- Dark Slate Gray #2F4F4F ΔE 0.064
Use #425F66 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.