#024C9C
Closest named color: Cobalt (#1E488F). oklch(42.7% 0.145 256.2), rgb(2, 76, 156).
Aa
White text reads best on this color (8.34:1).
About this color
#024C9C is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.145 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.025 away. White text reads best on it, at 8.34:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.51:1 |
| White text | 8.34:1 |
Values
| HEX | #024C9C |
| RGB | rgb(2, 76, 156) |
| HSL | hsl(211, 97%, 31%) |
| OKLCH | oklch(42.7% 0.145 256.2) |
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 #024C9C | 8.34:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #024C9C | 2.51:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #024C9C text on white | 8.34:1 | AAA | Lc 88.1 | Fine for body text |
| #024C9C text on black | 2.51:1 | Fails | Lc -14.1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFB
oklch(93.7% 0.025 257.6)
-
Step 200
200
#C5DBF9
oklch(88.5% 0.048 256.2)
-
Step 300
300
#9DC3F7
oklch(80.8% 0.085 256.3)
-
Step 400
400
#65A2F4
oklch(70.6% 0.137 256.2)
-
Step 500
500
#3788F0
oklch(63.1% 0.175 256.3)
-
Step 600
600
#056FDE
oklch(55.5% 0.189 256.2)
-
Step 700
700
#005DBD
oklch(49.1% 0.169 256.1)
-
Step 800
800 (this color)
#024C9C
oklch(42.7% 0.145 256.2)
-
Step 900
900
#10407C
oklch(37.6% 0.114 256.4)
-
Step 950
950
#0B2649
oklch(27% 0.073 256.3)
#024C9C 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) | #16559F | 0.028 |
| Deuteranopia (no green cones) | #00489A | 0.012 |
| Tritanopia (no blue cones) | #00606C | 0.110 |
| Achromatopsia (no color) | #4E4E4E | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #024C9C
#024C9C
oklch(42.7% 0.145 256.2)
- #6A4700
#6A4700
oklch(42.6% 0.089 76.7)
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 #024C9C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.025
- Dusk Blue #26538D ΔE 0.040
- Light Navy #155084 ΔE 0.043
- Deep Sea Blue #015482 ΔE 0.052
- Sapphire #2138AB ΔE 0.055
- Twilight Blue #0A437A ΔE 0.060
- Blueberry #464196 ΔE 0.063
- Light Navy Blue #2E5A88 ΔE 0.064
Use #024C9C 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.