#437ABE
Closest named color: Windows Blue (#3778BF). oklch(57.4% 0.121 254.8), rgb(67, 122, 190).
Aa
Black text reads best on this color (4.76:1).
About this color
#437ABE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.121 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.013 away. Black text reads best on it, at 4.76:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.121) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.76:1 |
| White text | 4.40:1 |
Values
| HEX | #437ABE |
| RGB | rgb(67, 122, 190) |
| HSL | hsl(213, 49%, 50%) |
| OKLCH | oklch(57.4% 0.121 254.8) |
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 #437ABE | 4.40:1 | AA large text | Lc -75.8 | Fine for body text |
| Black text on #437ABE | 4.76:1 | AA | Lc 33.8 | Non-text elements, placeholder text |
| #437ABE text on white | 4.40:1 | AA large text | Lc 70.3 | Content text, not long reading |
| #437ABE text on black | 4.76:1 | AA | Lc -31.3 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF4
oklch(93.7% 0.015 251.2)
-
Step 200
200
#CCDBED
oklch(88.6% 0.03 253)
-
Step 300
300
#A9C3E4
oklch(80.9% 0.055 254.5)
-
Step 400
400
#7BA3D6
oklch(70.6% 0.087 254.8)
-
Step 500
500
#598CCB
oklch(63.1% 0.11 254.4)
-
Step 600
600 (this color)
#437ABE
oklch(57.4% 0.121 254.8)
-
Step 700
700
#30629F
oklch(49.2% 0.112 254.8)
-
Step 800
800
#285081
oklch(42.7% 0.094 254.7)
-
Step 900
900
#254367
oklch(37.8% 0.072 254)
-
Step 950
950
#16273C
oklch(26.9% 0.046 254.4)
#437ABE 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) | #5C7FC1 | 0.032 |
| Deuteranopia (no green cones) | #4B73BD | 0.020 |
| Tritanopia (no blue cones) | #008A93 | 0.098 |
| Achromatopsia (no color) | #787878 | 0.121 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #437ABE
#437ABE
oklch(57.4% 0.121 254.8)
- #A16C02
#A16C02
oklch(57.3% 0.12 74.9)
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 #437ABE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.013
- Steel Blue #4682B4 ΔE 0.031
- Cool Blue #4984B8 ΔE 0.033
- Flat Blue #3C73A8 ΔE 0.038
- Nice Blue #107AB0 ΔE 0.040
- Water Blue #0E87CC ΔE 0.042
- French Blue #436BAD ΔE 0.045
- Off Blue #5684AE ΔE 0.047
Use #437ABE 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.