#37638D
Closest named color: Denim (#3B638C). oklch(48.7% 0.084 248.9), rgb(55, 99, 141).
Aa
White text reads best on this color (6.30:1).
About this color
#37638D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 49%, its chroma 0.084 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.004 away. White text reads best on it, at 6.30:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.33:1 |
| White text | 6.30:1 |
Values
| HEX | #37638D |
| RGB | rgb(55, 99, 141) |
| HSL | hsl(209, 44%, 38%) |
| OKLCH | oklch(48.7% 0.084 248.9) |
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 #37638D | 6.30:1 | AA | Lc -86.3 | Fine for body text |
| Black text on #37638D | 3.33:1 | AA large text | Lc 22.8 | Dividers and decoration only |
| #37638D text on white | 6.30:1 | AA | Lc 81.2 | Fine for body text |
| #37638D text on black | 3.33:1 | AA large text | Lc -20.7 | 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 700.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF2
oklch(93.7% 0.012 248)
-
Step 200
200
#CEDBE8
oklch(88.6% 0.023 248.1)
-
Step 300
300
#ADC3DA
oklch(80.8% 0.041 249.5)
-
Step 400
400
#81A4C8
oklch(70.6% 0.066 249.5)
-
Step 500
500
#618EBA
oklch(63.2% 0.083 248.7)
-
Step 600
600
#4777A6
oklch(55.6% 0.09 249.3)
-
Step 700
700 (this color)
#37638D
oklch(48.7% 0.084 248.9)
-
Step 800
800
#2F5273
oklch(42.7% 0.069 248.4)
-
Step 900
900
#2A445D
oklch(37.7% 0.054 248.5)
-
Step 950
950
#192837
oklch(27.1% 0.035 249.2)
#37638D 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) | #51658F | 0.032 |
| Deuteranopia (no green cones) | #465C8C | 0.024 |
| Tritanopia (no blue cones) | #006D72 | 0.068 |
| Achromatopsia (no color) | #606060 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37638D
#37638D
oklch(48.7% 0.084 248.9)
- #7E5625
#7E5625
oklch(48.7% 0.084 68.9)
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 #37638D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.004
- Dusky Blue #475F94 ΔE 0.025
- Denim Blue #3B5B92 ΔE 0.027
- Light Navy Blue #2E5A88 ΔE 0.030
- Peacock Blue #016795 ΔE 0.030
- YInMn Blue #415A77 ΔE 0.039
- Ocean Blue #03719C ΔE 0.045
- Muted Blue #3B719F ΔE 0.046
Use #37638D 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.