#37688C
Closest named color: Denim (#3B638C). oklch(49.9% 0.079 242.4), rgb(55, 104, 140).
Aa
White text reads best on this color (5.96:1).
About this color
#37688C is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.079 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.015 away. White text reads best on it, at 5.96:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.52:1 |
| White text | 5.96:1 |
Values
| HEX | #37688C |
| RGB | rgb(55, 104, 140) |
| HSL | hsl(205, 44%, 38%) |
| OKLCH | oklch(49.9% 0.079 242.4) |
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 #37688C | 5.96:1 | AA | Lc -84.9 | Fine for body text |
| Black text on #37688C | 3.52:1 | AA large text | Lc 24.4 | Dividers and decoration only |
| #37688C text on white | 5.96:1 | AA | Lc 79.7 | Fine for body text |
| #37688C text on black | 3.52:1 | AA large text | Lc -22.2 | 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
#7FA6C4
oklch(70.7% 0.061 241.8)
-
Step 500
500
#5E8FB5
oklch(63% 0.078 242.8)
-
Step 600
600
#4379A1
oklch(55.6% 0.085 242.5)
-
Step 700
700 (this color)
#37688C
oklch(49.9% 0.079 242.4)
-
Step 800
800
#2C5370
oklch(42.7% 0.066 242.6)
-
Step 900
900
#28455A
oklch(37.7% 0.05 241.3)
-
Step 950
950
#182835
oklch(26.9% 0.033 243.9)
#37688C 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) | #58688E | 0.039 |
| Deuteranopia (no green cones) | #4D608B | 0.032 |
| Tritanopia (no blue cones) | #007174 | 0.062 |
| Achromatopsia (no color) | #636363 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37688C
#37688C
oklch(49.9% 0.079 242.4)
- #835831
#835831
oklch(49.9% 0.079 61.6)
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 #37688C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.015
- Peacock Blue #016795 ΔE 0.032
- Dusky Blue #475F94 ΔE 0.036
- Ocean Blue #03719C ΔE 0.037
- Muted Blue #3B719F ΔE 0.037
- Sea Blue #047495 ΔE 0.039
- Denim Blue #3B5B92 ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.044
Use #37688C 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.