#37639A
Closest named color: Dusky Blue (#475F94). oklch(49.5% 0.101 254.9), rgb(55, 99, 154).
Aa
White text reads best on this color (6.15:1).
About this color
#37639A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 49%, its chroma 0.101 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.020 away. White text reads best on it, at 6.15:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.41:1 |
| White text | 6.15:1 |
Values
| HEX | #37639A |
| RGB | rgb(55, 99, 154) |
| HSL | hsl(213, 47%, 41%) |
| OKLCH | oklch(49.5% 0.101 254.9) |
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 #37639A | 6.15:1 | AA | Lc -85.7 | Fine for body text |
| Black text on #37639A | 3.41:1 | AA large text | Lc 23.6 | Dividers and decoration only |
| #37639A text on white | 6.15:1 | AA | Lc 80.5 | Fine for body text |
| #37639A text on black | 3.41:1 | AA large text | Lc -21.4 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EBF3
oklch(93.7% 0.013 251.6)
-
Step 200
200
#CDDAEB
oklch(88.4% 0.027 255.1)
-
Step 300
300
#ACC3E0
oklch(80.9% 0.048 254.3)
-
Step 400
400
#7FA3D1
oklch(70.6% 0.079 254.8)
-
Step 500
500
#5F8CC5
oklch(63.2% 0.1 254.9)
-
Step 600
600
#4575B2
oklch(55.7% 0.109 255.2)
-
Step 700
700 (this color)
#37639A
oklch(49.5% 0.101 254.9)
-
Step 800
800
#2D507C
oklch(42.7% 0.084 255)
-
Step 900
900
#294364
oklch(37.8% 0.065 255)
-
Step 950
950
#18273A
oklch(26.9% 0.041 254.8)
#37639A 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) | #4B679C | 0.027 |
| Deuteranopia (no green cones) | #3E5D99 | 0.017 |
| Tritanopia (no blue cones) | #007077 | 0.084 |
| Achromatopsia (no color) | #616161 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37639A
#37639A
oklch(49.5% 0.101 254.9)
- #835808
#835808
oklch(49.5% 0.101 75)
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 #37639A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.020
- Denim #3B638C ΔE 0.023
- Denim Blue #3B5B92 ΔE 0.024
- Peacock Blue #016795 ΔE 0.032
- Light Navy Blue #2E5A88 ΔE 0.038
- French Blue #436BAD ΔE 0.039
- Mid Blue #276AB3 ΔE 0.041
- Muted Blue #3B719F ΔE 0.041
Use #37639A 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.