#37439B
Closest named color: Blueberry (#464196). oklch(42.5% 0.143 272.9), rgb(55, 67, 155).
Aa
White text reads best on this color (8.61:1).
About this color
#37439B is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.143 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.023 away. White text reads best on it, at 8.61:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.43:1 |
| White text | 8.61:1 |
Values
| HEX | #37439B |
| RGB | rgb(55, 67, 155) |
| HSL | hsl(233, 48%, 41%) |
| OKLCH | oklch(42.5% 0.143 272.9) |
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 #37439B | 8.61:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #37439B | 2.43:1 | Fails | Lc 14.8 | Not readable |
| #37439B text on white | 8.61:1 | AAA | Lc 89.2 | Fine for body text |
| #37439B text on black | 2.43:1 | Fails | Lc -13.0 | 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
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CFD8F9
oklch(88.6% 0.047 273.4)
-
Step 300
300
#AEBEF7
oklch(80.9% 0.083 272.3)
-
Step 400
400
#859AF3
oklch(70.7% 0.132 272.5)
-
Step 500
500
#697DEF
oklch(63% 0.171 273)
-
Step 600
600
#5363DE
oklch(55.6% 0.187 273.1)
-
Step 700
700
#4452C0
oklch(49.2% 0.171 272.9)
-
Step 800
800 (this color)
#37439B
oklch(42.5% 0.143 272.9)
-
Step 900
900
#2F3A7C
oklch(37.7% 0.112 272.8)
-
Step 950
950
#1B2348
oklch(27% 0.069 271.9)
#37439B 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) | #00509E | 0.047 |
| Deuteranopia (no green cones) | #004899 | 0.042 |
| Tritanopia (no blue cones) | #005868 | 0.120 |
| Achromatopsia (no color) | #4C4C4C | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #37439B
#37439B
oklch(42.5% 0.143 272.9)
- #5F4D00
#5F4D00
oklch(42.6% 0.087 93.4)
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 #37439B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.023
- Cobalt #1E488F ΔE 0.036
- Dark Slate Blue #483D8B ΔE 0.037
- Sapphire #2138AB ΔE 0.048
- Dusk Blue #26538D ΔE 0.053
- Twilight #4E518B ΔE 0.062
- Light Navy #155084 ΔE 0.062
- Denim Blue #3B5B92 ΔE 0.071
Use #37439B 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.