#437AA0
Closest named color: Cerulean (#457B9D). oklch(55.8% 0.083 240.6), rgb(67, 122, 160).
Aa
White text reads best on this color (4.63:1).
About this color
#437AA0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.083 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Cerulean (#457B9D), ΔE 0.007 away. White text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Cerulean (#457B9D) |
| Black text | 4.53:1 |
| White text | 4.63:1 |
Values
| HEX | #437AA0 |
| RGB | rgb(67, 122, 160) |
| HSL | hsl(205, 41%, 45%) |
| OKLCH | oklch(55.8% 0.083 240.6) |
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 #437AA0 | 4.63:1 | AA | Lc -77.5 | Fine for body text |
| Black text on #437AA0 | 4.53:1 | AA | Lc 32.0 | Non-text elements, placeholder text |
| #437AA0 text on white | 4.63:1 | AA | Lc 72.0 | Content text, not long reading |
| #437AA0 text on black | 4.53:1 | AA | Lc -29.6 | 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
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CDDBE6
oklch(88.4% 0.021 241.4)
-
Step 300
300
#ACC4D7
oklch(80.8% 0.038 241.9)
-
Step 400
400
#7FA6C3
oklch(70.7% 0.06 240.9)
-
Step 500
500
#5D90B4
oklch(63.2% 0.077 240.3)
-
Step 600
600 (this color)
#437AA0
oklch(55.8% 0.083 240.6)
-
Step 700
700
#346688
oklch(49.1% 0.077 240.5)
-
Step 800
800
#2C536F
oklch(42.6% 0.064 241.6)
-
Step 900
900
#28455A
oklch(37.7% 0.05 241.3)
-
Step 950
950
#182934
oklch(27.1% 0.031 237.8)
#437AA0 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) | #697AA2 | 0.044 |
| Deuteranopia (no green cones) | #5C709F | 0.037 |
| Tritanopia (no blue cones) | #008387 | 0.065 |
| Achromatopsia (no color) | #757575 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #437AA0
#437AA0
oklch(55.8% 0.083 240.6)
- #97683F
#97683F
oklch(55.8% 0.083 61)
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 #437AA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cerulean #457B9D ΔE 0.007
- Dull Blue #49759C ΔE 0.015
- Stormy Blue #507B9C ΔE 0.015
- Flat Blue #3C73A8 ΔE 0.028
- Muted Blue #3B719F ΔE 0.029
- Metallic Blue #4F738E ΔE 0.031
- Steel Blue #4682B4 ΔE 0.035
- Nice Blue #107AB0 ΔE 0.037
Use #437AA0 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.