#37678B
Closest named color: Denim (#3B638C). oklch(49.6% 0.078 242.9), rgb(55, 103, 139).
Aa
White text reads best on this color (6.04:1).
About this color
#37678B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.078 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.013 away. White text reads best on it, at 6.04:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.47:1 |
| White text | 6.04:1 |
Values
| HEX | #37678B |
| RGB | rgb(55, 103, 139) |
| HSL | hsl(206, 43%, 38%) |
| OKLCH | oklch(49.6% 0.078 242.9) |
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 #37678B | 6.04:1 | AA | Lc -85.2 | Fine for body text |
| Black text on #37678B | 3.47:1 | AA large text | Lc 24.0 | Dividers and decoration only |
| #37678B text on white | 6.04:1 | AA | Lc 80.0 | Fine for body text |
| #37678B text on black | 3.47:1 | AA large text | Lc -21.8 | 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 700.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CEDBE6
oklch(88.5% 0.021 243.4)
-
Step 300
300
#ACC4D8
oklch(80.9% 0.039 243.3)
-
Step 400
400
#80A6C4
oklch(70.8% 0.061 242.5)
-
Step 500
500
#5F8FB5
oklch(63.1% 0.078 243.3)
-
Step 600
600
#4479A1
oklch(55.6% 0.084 242.9)
-
Step 700
700 (this color)
#37678B
oklch(49.6% 0.078 242.9)
-
Step 800
800
#2D5370
oklch(42.7% 0.065 243.2)
-
Step 900
900
#29455A
oklch(37.8% 0.05 242.1)
-
Step 950
950
#182835
oklch(26.9% 0.033 243.9)
#37678B 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) | #57678D | 0.038 |
| Deuteranopia (no green cones) | #4C5F8A | 0.031 |
| Tritanopia (no blue cones) | #007073 | 0.062 |
| Achromatopsia (no color) | #636363 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37678B
#37678B
oklch(49.6% 0.078 242.9)
- #815830
#815830
oklch(49.6% 0.078 63.7)
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 #37678B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.013
- Peacock Blue #016795 ΔE 0.032
- Dusky Blue #475F94 ΔE 0.035
- Ocean Blue #03719C ΔE 0.039
- Muted Blue #3B719F ΔE 0.040
- Denim Blue #3B5B92 ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.041
- Sea Blue #047495 ΔE 0.041
Use #37678B 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.