#437CAB
Closest named color: Steel Blue (#4682B4). oklch(56.8% 0.095 245.4), rgb(67, 124, 171).
Aa
Black text reads best on this color (4.70:1).
About this color
#437CAB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.095 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.020 away. Black text reads best on it, at 4.70:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.70:1 |
| White text | 4.45:1 |
Values
| HEX | #437CAB |
| RGB | rgb(67, 124, 171) |
| HSL | hsl(207, 44%, 47%) |
| OKLCH | oklch(56.8% 0.095 245.4) |
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 #437CAB | 4.45:1 | AA large text | Lc -76.2 | Fine for body text |
| Black text on #437CAB | 4.70:1 | AA | Lc 33.3 | Non-text elements, placeholder text |
| #437CAB text on white | 4.45:1 | AA large text | Lc 70.8 | Content text, not long reading |
| #437CAB text on black | 4.70:1 | AA | Lc -30.9 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF2
oklch(93.6% 0.013 244.3)
-
Step 200
200
#CDDBE8
oklch(88.5% 0.023 246.1)
-
Step 300
300
#ABC4DB
oklch(80.9% 0.042 246.1)
-
Step 400
400
#7DA5C9
oklch(70.6% 0.069 246.1)
-
Step 500
500
#5B8FBB
oklch(63.1% 0.087 245.3)
-
Step 600
600 (this color)
#437CAB
oklch(56.8% 0.095 245.4)
-
Step 700
700
#31658F
oklch(49.1% 0.088 245.3)
-
Step 800
800
#295374
oklch(42.8% 0.072 244.4)
-
Step 900
900
#26455E
oklch(37.8% 0.057 244.4)
-
Step 950
950
#172837
oklch(26.9% 0.036 246.3)
#437CAB 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) | #687DAD | 0.042 |
| Deuteranopia (no green cones) | #5A73AA | 0.033 |
| Tritanopia (no blue cones) | #00878C | 0.075 |
| Achromatopsia (no color) | #777777 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #437CAB
#437CAB
oklch(56.8% 0.095 245.4)
- #9D6A35
#9D6A35
oklch(56.7% 0.095 64.8)
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 #437CAB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.020
- Cerulean #457B9D ΔE 0.022
- Stormy Blue #507B9C ΔE 0.025
- Dull Blue #49759C ΔE 0.027
- Flat Blue #3C73A8 ΔE 0.028
- Cool Blue #4984B8 ΔE 0.029
- Off Blue #5684AE ΔE 0.032
- Nice Blue #107AB0 ΔE 0.032
Use #437CAB 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.