#427C8B
Closest named color: Cerulean (#457B9D). oklch(55.3% 0.065 216.6), rgb(66, 124, 139).
Aa
White text reads best on this color (4.67:1).
About this color
#427C8B is a medium-dark, muted teal or cyan. In OKLCH its lightness is 55%, its chroma 0.065 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.030 away. White text reads best on it, at 4.67:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (55%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.48:1 |
| White text | 4.67:1 |
Values
| HEX | #427C8B |
| RGB | rgb(66, 124, 139) |
| HSL | hsl(192, 36%, 40%) |
| OKLCH | oklch(55.3% 0.065 216.6) |
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 #427C8B | 4.67:1 | AA | Lc -77.8 | Fine for body text |
| Black text on #427C8B | 4.48:1 | AA large text | Lc 31.7 | Non-text elements, placeholder text |
| #427C8B text on white | 4.67:1 | AA | Lc 72.4 | Content text, not long reading |
| #427C8B text on black | 4.48:1 | AA large text | Lc -29.3 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBED
oklch(93.5% 0.008 216.6)
-
Step 200
200
#CEDCE0
oklch(88.5% 0.016 216.7)
-
Step 300
300
#ACC6CD
oklch(80.9% 0.03 215.8)
-
Step 400
400
#80A8B4
oklch(70.7% 0.047 218.2)
-
Step 500
500
#5E93A1
oklch(63.1% 0.06 216.3)
-
Step 600
600 (this color)
#427C8B
oklch(55.3% 0.065 216.6)
-
Step 700
700
#346977
oklch(49% 0.06 217.2)
-
Step 800
800
#2C5661
oklch(42.7% 0.05 216.8)
-
Step 900
900
#28474F
oklch(37.7% 0.039 216.1)
-
Step 950
950
#182A2E
oklch(27.1% 0.025 213.2)
#427C8B 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) | #72798C | 0.058 |
| Deuteranopia (no green cones) | #67708B | 0.053 |
| Tritanopia (no blue cones) | #148281 | 0.039 |
| Achromatopsia (no color) | #747474 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #427C8B
#427C8B
oklch(55.3% 0.065 216.6)
- #946558
#946558
oklch(55.3% 0.065 36.1)
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 #427C8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.030
- Metallic Blue #4F738E ΔE 0.031
- Stormy Blue #507B9C ΔE 0.033
- Ocean #017B92 ΔE 0.035
- Grey Blue #647D8E ΔE 0.039
- Dull Blue #49759C ΔE 0.040
- Teal #008080 ΔE 0.042
- Deep Aqua #08787F ΔE 0.043
Use #427C8B 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.