#37618B
Closest named color: Denim (#3B638C). oklch(48.1% 0.083 249.9), rgb(55, 97, 139).
Aa
White text reads best on this color (6.47:1).
About this color
#37618B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 48%, its chroma 0.083 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.008 away. White text reads best on it, at 6.47:1.
| Hue family | Blues |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.24:1 |
| White text | 6.47:1 |
Values
| HEX | #37618B |
| RGB | rgb(55, 97, 139) |
| HSL | hsl(210, 43%, 38%) |
| OKLCH | oklch(48.1% 0.083 249.9) |
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 #37618B | 6.47:1 | AA | Lc -87.0 | Fine for body text |
| Black text on #37618B | 3.24:1 | AA large text | Lc 22.1 | Dividers and decoration only |
| #37618B text on white | 6.47:1 | AA | Lc 82.0 | Fine for body text |
| #37618B text on black | 3.24:1 | AA large text | Lc -19.9 | 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
#CEDBE8
oklch(88.6% 0.023 248.1)
-
Step 300
300
#AEC3DA
oklch(80.9% 0.04 250.7)
-
Step 400
400
#82A4C8
oklch(70.6% 0.065 250.2)
-
Step 500
500
#628DBA
oklch(63% 0.083 250.3)
-
Step 600
600
#4977A6
oklch(55.7% 0.089 250.2)
-
Step 700
700 (this color)
#37618B
oklch(48.1% 0.083 249.9)
-
Step 800
800
#305273
oklch(42.8% 0.068 249)
-
Step 900
900
#2B445D
oklch(37.8% 0.053 249.4)
-
Step 950
950
#192836
oklch(27% 0.033 247.4)
#37618B 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) | #4F638D | 0.030 |
| Deuteranopia (no green cones) | #445A8A | 0.023 |
| Tritanopia (no blue cones) | #006B70 | 0.069 |
| Achromatopsia (no color) | #5E5E5E | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37618B
#37618B
oklch(48.1% 0.083 249.9)
- #7C5524
#7C5524
oklch(48.2% 0.083 69.6)
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 #37618B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.008
- Denim Blue #3B5B92 ΔE 0.023
- Light Navy Blue #2E5A88 ΔE 0.024
- Dusky Blue #475F94 ΔE 0.025
- Peacock Blue #016795 ΔE 0.032
- YInMn Blue #415A77 ΔE 0.034
- Dusk #4E5481 ΔE 0.043
- Dusk Blue #26538D ΔE 0.048
Use #37618B 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.