#437ACA
Closest named color: Windows Blue (#3778BF). oklch(58.1% 0.137 257.8), rgb(67, 122, 202).
Aa
Black text reads best on this color (4.87:1).
About this color
#437ACA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.137 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.021 away. Black text reads best on it, at 4.87:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.87:1 |
| White text | 4.30:1 |
Values
| HEX | #437ACA |
| RGB | rgb(67, 122, 202) |
| HSL | hsl(216, 56%, 53%) |
| OKLCH | oklch(58.1% 0.137 257.8) |
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 #437ACA | 4.30:1 | AA large text | Lc -75.0 | Fine for body text |
| Black text on #437ACA | 4.87:1 | AA | Lc 34.5 | Non-text elements, placeholder text |
| #437ACA text on white | 4.30:1 | AA large text | Lc 69.5 | Content text, not long reading |
| #437ACA text on black | 4.87:1 | AA | Lc -32.1 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EBF6
oklch(93.7% 0.017 256.3)
-
Step 200
200
#CBDAF0
oklch(88.4% 0.034 257.9)
-
Step 300
300
#A8C2E9
oklch(80.8% 0.062 258.4)
-
Step 400
400
#7AA2DE
oklch(70.7% 0.099 258.3)
-
Step 500
500
#578AD5
oklch(63.1% 0.126 257.9)
-
Step 600
600 (this color)
#437ACA
oklch(58.1% 0.137 257.8)
-
Step 700
700
#2E60A7
oklch(49.2% 0.126 257.6)
-
Step 800
800
#274E88
oklch(42.7% 0.106 258.3)
-
Step 900
900
#24426C
oklch(37.8% 0.081 257.1)
-
Step 950
950
#162740
oklch(27.2% 0.052 257.9)
#437ACA 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) | #5681CD | 0.029 |
| Deuteranopia (no green cones) | #4174C8 | 0.017 |
| Tritanopia (no blue cones) | #008C98 | 0.110 |
| Achromatopsia (no color) | #7A7A7A | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #437ACA
#437ACA
oklch(58.1% 0.137 257.8)
- #A17000
#A17000
oklch(58.1% 0.121 78.3)
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 #437ACA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.021
- Water Blue #0E87CC ΔE 0.041
- Cool Blue #4984B8 ΔE 0.045
- Steel Blue #4682B4 ΔE 0.045
- Nice Blue #107AB0 ΔE 0.054
- Flat Blue #3C73A8 ΔE 0.055
- French Blue #436BAD ΔE 0.056
- Royal Blue #4169E1 ΔE 0.061
Use #437ACA 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.