#37749E
Closest named color: Muted Blue (#3B719F). oklch(53.7% 0.091 241.4), rgb(55, 116, 158).
Aa
White text reads best on this color (5.05:1).
About this color
#37749E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.091 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.010 away. White text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 4.15:1 |
| White text | 5.05:1 |
Values
| HEX | #37749E |
| RGB | rgb(55, 116, 158) |
| HSL | hsl(204, 48%, 42%) |
| OKLCH | oklch(53.7% 0.091 241.4) |
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 #37749E | 5.05:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #37749E | 4.15:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #37749E text on white | 5.05:1 | AA | Lc 74.7 | Content text, not long reading |
| #37749E text on black | 4.15:1 | AA large text | Lc -27.0 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF1
oklch(93.6% 0.012 239.9)
-
Step 200
200
#CCDBE7
oklch(88.4% 0.023 241.9)
-
Step 300
300
#AAC5D9
oklch(81% 0.041 240.1)
-
Step 400
400
#7CA6C6
oklch(70.6% 0.065 241.7)
-
Step 500
500
#5990B8
oklch(63.1% 0.084 241.4)
-
Step 600
600 (this color)
#37749E
oklch(53.7% 0.091 241.4)
-
Step 700
700
#2E668C
oklch(49% 0.085 241.2)
-
Step 800
800
#285372
oklch(42.6% 0.07 242.3)
-
Step 900
900
#25455C
oklch(37.7% 0.055 241.5)
-
Step 950
950
#162936
oklch(27.1% 0.035 239.7)
#37749E 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) | #6174A0 | 0.047 |
| Deuteranopia (no green cones) | #536A9D | 0.038 |
| Tritanopia (no blue cones) | #007E82 | 0.067 |
| Achromatopsia (no color) | #6F6F6F | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37749E
#37749E
oklch(53.7% 0.091 241.4)
- #946132
#946132
oklch(53.8% 0.091 61.5)
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 #37749E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.010
- Flat Blue #3C73A8 ΔE 0.018
- Dull Blue #49759C ΔE 0.018
- Cerulean #457B9D ΔE 0.027
- Ocean Blue #03719C ΔE 0.029
- Sea Blue #047495 ΔE 0.030
- Metallic Blue #4F738E ΔE 0.032
- Nice Blue #107AB0 ΔE 0.032
Use #37749E 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.