#437991
Closest named color: Cerulean (#457B9D). oklch(54.9% 0.068 228.7), rgb(67, 121, 145).
Aa
White text reads best on this color (4.79:1).
About this color
#437991 is a medium-dark, muted teal or cyan. In OKLCH its lightness is 55%, its chroma 0.068 and its hue 229°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.019 away. White text reads best on it, at 4.79:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (55%) |
| Chroma | muted (0.068) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.38:1 |
| White text | 4.79:1 |
Values
| HEX | #437991 |
| RGB | rgb(67, 121, 145) |
| HSL | hsl(198, 37%, 42%) |
| OKLCH | oklch(54.9% 0.068 228.7) |
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 #437991 | 4.79:1 | AA | Lc -78.6 | Fine for body text |
| Black text on #437991 | 4.38:1 | AA large text | Lc 31.0 | Non-text elements, placeholder text |
| #437991 text on white | 4.79:1 | AA | Lc 73.1 | Content text, not long reading |
| #437991 text on black | 4.38:1 | AA large text | Lc -28.6 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBEF
oklch(93.6% 0.009 232.4)
-
Step 200
200
#CEDCE2
oklch(88.6% 0.017 225.2)
-
Step 300
300
#ADC5D1
oklch(80.9% 0.031 229.3)
-
Step 400
400
#81A7B9
oklch(70.7% 0.049 228.5)
-
Step 500
500
#6091A8
oklch(63.1% 0.063 229.1)
-
Step 600
600 (this color)
#437991
oklch(54.9% 0.068 228.7)
-
Step 700
700
#36687D
oklch(49.1% 0.063 227.5)
-
Step 800
800
#2E5566
oklch(42.8% 0.052 228.1)
-
Step 900
900
#294653
oklch(37.7% 0.041 228.3)
-
Step 950
950
#192931
oklch(27% 0.026 230.6)
#437991 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) | #6D7792 | 0.050 |
| Deuteranopia (no green cones) | #616F91 | 0.043 |
| Tritanopia (no blue cones) | #108081 | 0.049 |
| Achromatopsia (no color) | #727272 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #437991
#437991
oklch(54.9% 0.068 228.7)
- #92654D
#92654D
oklch(54.8% 0.068 48.9)
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 #437991, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.019
- Metallic Blue #4F738E ΔE 0.020
- Stormy Blue #507B9C ΔE 0.023
- Dull Blue #49759C ΔE 0.025
- Ocean #017B92 ΔE 0.034
- Muted Blue #3B719F ΔE 0.038
- Grey Blue #647D8E ΔE 0.041
- Sea Blue #047495 ΔE 0.041
Use #437991 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.