#427B8F
Closest named color: Cerulean (#457B9D). oklch(55.2% 0.067 223.1), rgb(66, 123, 143).
Aa
White text reads best on this color (4.70:1).
About this color
#427B8F is a medium-dark, muted teal or cyan. In OKLCH its lightness is 55%, its chroma 0.067 and its hue 223°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.023 away. White text reads best on it, at 4.70:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (55%) |
| Chroma | muted (0.067) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.46:1 |
| White text | 4.70:1 |
Values
| HEX | #427B8F |
| RGB | rgb(66, 123, 143) |
| HSL | hsl(196, 37%, 41%) |
| OKLCH | oklch(55.2% 0.067 223.1) |
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 #427B8F | 4.70:1 | AA | Lc -78.0 | Fine for body text |
| Black text on #427B8F | 4.46:1 | AA large text | Lc 31.5 | Non-text elements, placeholder text |
| #427B8F text on white | 4.70:1 | AA | Lc 72.5 | Content text, not long reading |
| #427B8F text on black | 4.46:1 | AA large text | Lc -29.1 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBEE
oklch(93.6% 0.009 225.1)
-
Step 200
200
#CEDCE1
oklch(88.5% 0.017 221.1)
-
Step 300
300
#ACC5CF
oklch(80.8% 0.031 223.9)
-
Step 400
400
#80A8B7
oklch(70.8% 0.049 222.9)
-
Step 500
500
#5E92A5
oklch(63.1% 0.062 223.1)
-
Step 600
600 (this color)
#427B8F
oklch(55.2% 0.067 223.1)
-
Step 700
700
#34697B
oklch(49.2% 0.063 222.6)
-
Step 800
800
#2C5564
oklch(42.6% 0.052 224)
-
Step 900
900
#284651
oklch(37.5% 0.04 223.5)
-
Step 950
950
#182930
oklch(26.9% 0.026 225.8)
#427B8F 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) | #707890 | 0.055 |
| Deuteranopia (no green cones) | #64708F | 0.048 |
| Tritanopia (no blue cones) | #0D8181 | 0.045 |
| Achromatopsia (no color) | #747474 | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #427B8F
#427B8F
oklch(55.2% 0.067 223.1)
- #946552
#946552
oklch(55.2% 0.068 42.9)
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 #427B8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.023
- Metallic Blue #4F738E ΔE 0.025
- Stormy Blue #507B9C ΔE 0.027
- Dull Blue #49759C ΔE 0.032
- Ocean #017B92 ΔE 0.033
- Grey Blue #647D8E ΔE 0.039
- Teal Blue #01889F ΔE 0.044
- Sea Blue #047495 ΔE 0.045
Use #427B8F 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.