#437F8A
Closest named color: Cerulean (#457B9D). oklch(56% 0.064 210.8), rgb(67, 127, 138).
Aa
Black text reads best on this color (4.64:1).
About this color
#437F8A is a medium-dark, muted teal or cyan. In OKLCH its lightness is 56%, its chroma 0.064 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.036 away. Black text reads best on it, at 4.64:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (56%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.64:1 |
| White text | 4.52:1 |
Values
| HEX | #437F8A |
| RGB | rgb(67, 127, 138) |
| HSL | hsl(189, 35%, 40%) |
| OKLCH | oklch(56% 0.064 210.8) |
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 #437F8A | 4.52:1 | AA | Lc -76.7 | Fine for body text |
| Black text on #437F8A | 4.64:1 | AA | Lc 32.8 | Non-text elements, placeholder text |
| #437F8A text on white | 4.52:1 | AA | Lc 71.3 | Content text, not long reading |
| #437F8A text on black | 4.64:1 | AA | Lc -30.4 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E4EBED
oklch(93.5% 0.008 216.6)
-
Step 200
200
#CEDCDF
oklch(88.5% 0.016 212)
-
Step 300
300
#ACC6CB
oklch(80.9% 0.029 210.5)
-
Step 400
400
#7FA9B1
oklch(70.7% 0.047 210.6)
-
Step 500
500
#5D949E
oklch(63.2% 0.06 210.3)
-
Step 600
600 (this color)
#437F8A
oklch(56% 0.064 210.8)
-
Step 700
700
#336A74
oklch(49.1% 0.06 210.9)
-
Step 800
800
#2B565E
oklch(42.6% 0.049 211.1)
-
Step 900
900
#28474D
oklch(37.6% 0.038 211.3)
-
Step 950
950
#182A2D
oklch(27.1% 0.024 209.1)
#437F8A 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) | #767B8B | 0.062 |
| Deuteranopia (no green cones) | #6A738A | 0.055 |
| Tritanopia (no blue cones) | #178482 | 0.035 |
| Achromatopsia (no color) | #767676 | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #437F8A
#437F8A
oklch(56% 0.064 210.8)
- #97665E
#97665E
oklch(56% 0.065 29.5)
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 #437F8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.036
- Stormy Blue #507B9C ΔE 0.037
- Grey Blue #647D8E ΔE 0.038
- Metallic Blue #4F738E ΔE 0.039
- Teal #008080 ΔE 0.040
- Ocean #017B92 ΔE 0.040
- Teal Blue #01889F ΔE 0.041
- Dark Cyan #008B8B ΔE 0.044
Use #437F8A 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.