#024399
Closest named color: Cobalt (#1E488F). oklch(40.4% 0.153 258.8), rgb(2, 67, 153).
Aa
White text reads best on this color (9.26:1).
About this color
#024399 is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.153 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.028 away. White text reads best on it, at 9.26:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.153) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.26:1 |
| White text | 9.26:1 |
Values
| HEX | #024399 |
| RGB | rgb(2, 67, 153) |
| HSL | hsl(214, 97%, 30%) |
| OKLCH | oklch(40.4% 0.153 258.8) |
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 #024399 | 9.26:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #024399 | 2.26:1 | Fails | Lc 13.4 | Not readable |
| #024399 text on white | 9.26:1 | AAA | Lc 90.6 | Preferred for body text |
| #024399 text on black | 2.26:1 | Fails | Lc -11.7 | 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 800.
-
Step 50
50
#F1F6FE
oklch(97.2% 0.012 259.8)
-
Step 100
100
#E0EBFC
oklch(93.7% 0.026 259)
-
Step 200
200
#C6DBFB
oklch(88.6% 0.05 258.7)
-
Step 300
300
#9EC2FB
oklch(80.9% 0.09 259.4)
-
Step 400
400
#67A1F8
oklch(70.7% 0.142 258.3)
-
Step 500
500
#3C86F5
oklch(63.1% 0.182 258.6)
-
Step 600
600
#166CE4
oklch(55.5% 0.198 258.8)
-
Step 700
700
#0559C6
oklch(49% 0.185 258.8)
-
Step 800
800 (this color)
#024399
oklch(40.4% 0.153 258.8)
-
Step 900
900
#133F7F
oklch(37.7% 0.119 258.5)
-
Step 950
950
#0D254A
oklch(26.9% 0.075 258.9)
#024399 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) | #004E9C | 0.030 |
| Deuteranopia (no green cones) | #004197 | 0.006 |
| Tritanopia (no blue cones) | #005967 | 0.116 |
| Achromatopsia (no color) | #474747 | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #024399
#024399
oklch(40.4% 0.153 258.8)
- #614200
#614200
oklch(40.4% 0.084 78.4)
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 #024399, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.028
- Sapphire #2138AB ΔE 0.041
- Twilight Blue #0A437A ΔE 0.052
- Light Navy #155084 ΔE 0.055
- Dusk Blue #26538D ΔE 0.058
- Blueberry #464196 ΔE 0.064
- Deep Sea Blue #015482 ΔE 0.066
- Dark Slate Blue #483D8B ΔE 0.072
Use #024399 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.