#37658B
Closest named color: Denim (#3B638C). oklch(49.1% 0.08 245.3), rgb(55, 101, 139).
Aa
White text reads best on this color (6.18:1).
About this color
#37658B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 49%, its chroma 0.080 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.007 away. White text reads best on it, at 6.18:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.39:1 |
| White text | 6.18:1 |
Values
| HEX | #37658B |
| RGB | rgb(55, 101, 139) |
| HSL | hsl(207, 43%, 38%) |
| OKLCH | oklch(49.1% 0.08 245.3) |
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 #37658B | 6.18:1 | AA | Lc -85.8 | Fine for body text |
| Black text on #37658B | 3.39:1 | AA large text | Lc 23.4 | Dividers and decoration only |
| #37658B text on white | 6.18:1 | AA | Lc 80.7 | Fine for body text |
| #37658B text on black | 3.39:1 | AA large text | Lc -21.2 | 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
#CEDBE7
oklch(88.5% 0.022 245.9)
-
Step 300
300
#ADC4D8
oklch(80.9% 0.038 244.5)
-
Step 400
400
#81A5C5
oklch(70.7% 0.061 245.6)
-
Step 500
500
#608FB6
oklch(63.2% 0.078 244.5)
-
Step 600
600
#4678A2
oklch(55.6% 0.085 245.5)
-
Step 700
700 (this color)
#37658B
oklch(49.1% 0.08 245.3)
-
Step 800
800
#2E5271
oklch(42.6% 0.067 246.2)
-
Step 900
900
#29445B
oklch(37.6% 0.052 245.5)
-
Step 950
950
#192835
oklch(27% 0.032 245.5)
#37658B 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) | #55668D | 0.036 |
| Deuteranopia (no green cones) | #495D8A | 0.029 |
| Tritanopia (no blue cones) | #006E72 | 0.064 |
| Achromatopsia (no color) | #616161 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37658B
#37658B
oklch(49.1% 0.08 245.3)
- #80572C
#80572C
oklch(49.2% 0.08 65.3)
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 #37658B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.007
- Dusky Blue #475F94 ΔE 0.031
- Peacock Blue #016795 ΔE 0.031
- Denim Blue #3B5B92 ΔE 0.034
- Light Navy Blue #2E5A88 ΔE 0.035
- YInMn Blue #415A77 ΔE 0.040
- Ocean Blue #03719C ΔE 0.042
- Muted Blue #3B719F ΔE 0.043
Use #37658B 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.