#37479D
Closest named color: Blueberry (#464196). oklch(43.5% 0.14 271.4), rgb(55, 71, 157).
Aa
White text reads best on this color (8.23:1).
About this color
#37479D is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.140 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.026 away. White text reads best on it, at 8.23:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.55:1 |
| White text | 8.23:1 |
Values
| HEX | #37479D |
| RGB | rgb(55, 71, 157) |
| HSL | hsl(231, 48%, 42%) |
| OKLCH | oklch(43.5% 0.14 271.4) |
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 #37479D | 8.23:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #37479D | 2.55:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #37479D text on white | 8.23:1 | AAA | Lc 88.1 | Fine for body text |
| #37479D text on black | 2.55:1 | Fails | Lc -14.0 | Not readable |
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 800.
-
Step 50
50
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4E9FA
oklch(93.5% 0.024 272.8)
-
Step 200
200
#CED8F8
oklch(88.5% 0.045 271.7)
-
Step 300
300
#ADBEF6
oklch(80.8% 0.082 271.4)
-
Step 400
400
#839BF2
oklch(70.8% 0.13 271.1)
-
Step 500
500
#667FEE
oklch(63.2% 0.168 271.3)
-
Step 600
600
#4F65DC
oklch(55.6% 0.182 271.3)
-
Step 700
700
#4153BF
oklch(49.1% 0.17 271.5)
-
Step 800
800 (this color)
#37479D
oklch(43.5% 0.14 271.4)
-
Step 900
900
#2E3B7B
oklch(37.8% 0.109 271.6)
-
Step 950
950
#1B2348
oklch(27% 0.069 271.9)
#37479D 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) | #0A53A0 | 0.042 |
| Deuteranopia (no green cones) | #004A9B | 0.040 |
| Tritanopia (no blue cones) | #005B6B | 0.117 |
| Achromatopsia (no color) | #4F4F4F | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37479D
#37479D
oklch(43.5% 0.14 271.4)
- #634F00
#634F00
oklch(43.6% 0.089 92)
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 #37479D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.026
- Cobalt #1E488F ΔE 0.036
- Dark Slate Blue #483D8B ΔE 0.042
- Dusk Blue #26538D ΔE 0.047
- Sapphire #2138AB ΔE 0.053
- Twilight #4E518B ΔE 0.056
- Light Navy #155084 ΔE 0.059
- Denim Blue #3B5B92 ΔE 0.062
Use #37479D 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.