#37639D
Closest named color: Dusky Blue (#475F94). oklch(49.6% 0.105 256), rgb(55, 99, 157).
Aa
White text reads best on this color (6.11:1).
About this color
#37639D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.105 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.022 away. White text reads best on it, at 6.11:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.43:1 |
| White text | 6.11:1 |
Values
| HEX | #37639D |
| RGB | rgb(55, 99, 157) |
| HSL | hsl(214, 48%, 42%) |
| OKLCH | oklch(49.6% 0.105 256) |
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 #37639D | 6.11:1 | AA | Lc -85.5 | Fine for body text |
| Black text on #37639D | 3.43:1 | AA large text | Lc 23.7 | Dividers and decoration only |
| #37639D text on white | 6.11:1 | AA | Lc 80.3 | Fine for body text |
| #37639D text on black | 3.43:1 | AA large text | Lc -21.5 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CDDAEC
oklch(88.4% 0.029 256.5)
-
Step 300
300
#ACC3E2
oklch(81% 0.051 255.9)
-
Step 400
400
#7FA3D3
oklch(70.7% 0.081 255.8)
-
Step 500
500
#5E8BC8
oklch(63% 0.105 256.3)
-
Step 600
600
#4474B4
oklch(55.5% 0.113 256.1)
-
Step 700
700 (this color)
#37639D
oklch(49.6% 0.105 256)
-
Step 800
800
#2D507E
oklch(42.8% 0.087 255.9)
-
Step 900
900
#284265
oklch(37.6% 0.068 256.2)
-
Step 950
950
#18273B
oklch(27% 0.043 255.9)
#37639D 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) | #4A679F | 0.026 |
| Deuteranopia (no green cones) | #3C5D9C | 0.017 |
| Tritanopia (no blue cones) | #007078 | 0.086 |
| Achromatopsia (no color) | #626262 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37639D
#37639D
oklch(49.6% 0.105 256)
- #845800
#845800
oklch(49.6% 0.104 75.3)
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 #37639D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.022
- Denim Blue #3B5B92 ΔE 0.026
- Denim #3B638C ΔE 0.028
- Peacock Blue #016795 ΔE 0.035
- French Blue #436BAD ΔE 0.036
- Mid Blue #276AB3 ΔE 0.037
- Muted Blue #3B719F ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.042
Use #37639D 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.