#437E9D
Closest named color: Cerulean (#457B9D). oklch(56.6% 0.078 233.4), rgb(67, 126, 157).
Aa
Black text reads best on this color (4.70:1).
About this color
#437E9D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.078 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.009 away. Black text reads best on it, at 4.70:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.70:1 |
| White text | 4.45:1 |
Values
| HEX | #437E9D |
| RGB | rgb(67, 126, 157) |
| HSL | hsl(201, 40%, 44%) |
| OKLCH | oklch(56.6% 0.078 233.4) |
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 #437E9D | 4.45:1 | AA large text | Lc -76.3 | Fine for body text |
| Black text on #437E9D | 4.70:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #437E9D text on white | 4.45:1 | AA large text | Lc 70.8 | Content text, not long reading |
| #437E9D text on black | 4.70:1 | AA | Lc -30.9 | Non-text elements, placeholder text |
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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CDDCE4
oklch(88.6% 0.02 230.7)
-
Step 300
300
#ABC5D4
oklch(80.9% 0.035 233.2)
-
Step 400
400
#7EA7BE
oklch(70.7% 0.056 233.1)
-
Step 500
500
#5C91AE
oklch(63.1% 0.071 233.5)
-
Step 600
600 (this color)
#437E9D
oklch(56.6% 0.078 233.4)
-
Step 700
700
#316883
oklch(49.2% 0.072 232.2)
-
Step 800
800
#2A546B
oklch(42.6% 0.061 234.6)
-
Step 900
900
#274657
oklch(37.8% 0.047 233.9)
-
Step 950
950
#172933
oklch(27% 0.03 233.8)
#437E9D 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) | #6F7D9F | 0.051 |
| Deuteranopia (no green cones) | #62739D | 0.044 |
| Tritanopia (no blue cones) | #008688 | 0.057 |
| Achromatopsia (no color) | #777777 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #437E9D
#437E9D
oklch(56.6% 0.078 233.4)
- #9B6949
#9B6949
oklch(56.6% 0.079 53.1)
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 #437E9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.009
- Stormy Blue #507B9C ΔE 0.014
- Dull Blue #49759C ΔE 0.026
- Metallic Blue #4F738E ΔE 0.034
- Steel Blue #4682B4 ΔE 0.036
- Off Blue #5684AE ΔE 0.037
- Teal Blue #01889F ΔE 0.038
- Grey Blue #647D8E ΔE 0.040
Use #437E9D 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.