#37739E
Closest named color: Muted Blue (#3B719F). oklch(53.5% 0.092 242.4), rgb(55, 115, 158).
Aa
White text reads best on this color (5.11:1).
About this color
#37739E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.092 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.007 away. White text reads best on it, at 5.11:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 4.10:1 |
| White text | 5.11:1 |
Values
| HEX | #37739E |
| RGB | rgb(55, 115, 158) |
| HSL | hsl(205, 48%, 42%) |
| OKLCH | oklch(53.5% 0.092 242.4) |
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 #37739E | 5.11:1 | AA | Lc -80.4 | Fine for body text |
| Black text on #37739E | 4.10:1 | AA large text | Lc 29.0 | Dividers and decoration only |
| #37739E text on white | 5.11:1 | AA | Lc 75.0 | Fine for body text |
| #37739E text on black | 4.10:1 | AA large text | Lc -26.7 | 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
#CDDBE7
oklch(88.4% 0.022 243.8)
-
Step 300
300
#AAC4DA
oklch(80.8% 0.042 243.8)
-
Step 400
400
#7CA6C7
oklch(70.7% 0.067 242.5)
-
Step 500
500
#5990B9
oklch(63.2% 0.085 242.1)
-
Step 600
600 (this color)
#37739E
oklch(53.5% 0.092 242.4)
-
Step 700
700
#2F668D
oklch(49.1% 0.085 242.2)
-
Step 800
800
#285373
oklch(42.7% 0.072 243.1)
-
Step 900
900
#25455D
oklch(37.7% 0.056 242.6)
-
Step 950
950
#162836
oklch(26.8% 0.035 243.1)
#37739E 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) | #6074A0 | 0.046 |
| Deuteranopia (no green cones) | #52699D | 0.037 |
| Tritanopia (no blue cones) | #007E82 | 0.068 |
| Achromatopsia (no color) | #6E6E6E | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37739E
#37739E
oklch(53.5% 0.092 242.4)
- #936030
#936030
oklch(53.5% 0.092 61.9)
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 #37739E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.007
- Flat Blue #3C73A8 ΔE 0.017
- Dull Blue #49759C ΔE 0.019
- Ocean Blue #03719C ΔE 0.028
- Cerulean #457B9D ΔE 0.029
- Sea Blue #047495 ΔE 0.031
- Nice Blue #107AB0 ΔE 0.033
- Metallic Blue #4F738E ΔE 0.033
Use #37739E 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.