#24378D
Closest named color: Cobalt (#1E488F). oklch(37.8% 0.144 268.9), rgb(36, 55, 141).
Aa
White text reads best on this color (10.46:1).
About this color
#24378D is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.144 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.045 away. White text reads best on it, at 10.46:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.00:1 |
| White text | 10.46:1 |
Values
| HEX | #24378D |
| RGB | rgb(36, 55, 141) |
| HSL | hsl(229, 59%, 35%) |
| OKLCH | oklch(37.8% 0.144 268.9) |
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 #24378D | 10.46:1 | AAA | Lc -97.8 | Preferred for body text |
| Black text on #24378D | 2.00:1 | Fails | Lc 10.1 | Not readable |
| #24378D text on white | 10.46:1 | AAA | Lc 93.8 | Preferred for body text |
| #24378D text on black | 2.00:1 | Fails | Lc -8.7 | 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 900.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A7BEFF
oklch(80.8% 0.096 269.2)
-
Step 400
400
#7A9AFF
oklch(70.7% 0.152 269)
-
Step 500
500
#5A7CFF
oklch(63% 0.198 269.1)
-
Step 600
600
#3E5BFD
oklch(55.6% 0.241 268.9)
-
Step 700
700
#3249DC
oklch(49.1% 0.223 269)
-
Step 800
800
#293EB2
oklch(42.8% 0.184 268.9)
-
Step 900
900 (this color)
#24378D
oklch(37.8% 0.144 268.9)
-
Step 950
950
#152152
oklch(27% 0.091 269.1)
#24378D 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) | #004490 | 0.037 |
| Deuteranopia (no green cones) | #003B8B | 0.025 |
| Tritanopia (no blue cones) | #004D5C | 0.116 |
| Achromatopsia (no color) | #3F3F3F | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #24378D
#24378D
oklch(37.8% 0.144 268.9)
- #533F00
#533F00
oklch(37.9% 0.077 88.3)
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 #24378D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.045
- Sapphire #2138AB ΔE 0.049
- Twilight Blue #0A437A ΔE 0.050
- Dark Slate Blue #483D8B ΔE 0.057
- Blueberry #464196 ΔE 0.060
- Marine Blue #01386A ΔE 0.067
- Light Navy #155084 ΔE 0.072
- Royal #0C1793 ΔE 0.074
Use #24378D 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.