#024C9B
Closest named color: Cobalt (#1E488F). oklch(42.6% 0.144 256), rgb(2, 76, 155).
Aa
White text reads best on this color (8.36:1).
About this color
#024C9B is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.144 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.023 away. White text reads best on it, at 8.36:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.144) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.50:1 |
| White text | 8.36:1 |
Values
| HEX | #024C9B |
| RGB | rgb(2, 76, 155) |
| HSL | hsl(211, 97%, 31%) |
| OKLCH | oklch(42.6% 0.144 256) |
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 #024C9B | 8.36:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #024C9B | 2.50:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #024C9B text on white | 8.36:1 | AAA | Lc 88.2 | Fine for body text |
| #024C9B text on black | 2.50:1 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E0EBFA
oklch(93.6% 0.024 256.1)
-
Step 200
200
#C5DBF8
oklch(88.4% 0.047 255.4)
-
Step 300
300
#9DC3F7
oklch(80.8% 0.085 256.3)
-
Step 400
400
#66A2F3
oklch(70.6% 0.135 256.3)
-
Step 500
500
#3889EF
oklch(63.2% 0.172 255.9)
-
Step 600
600
#0670DD
oklch(55.7% 0.186 255.9)
-
Step 700
700
#005DBD
oklch(49.1% 0.169 256.1)
-
Step 800
800 (this color)
#024C9B
oklch(42.6% 0.144 256)
-
Step 900
900
#10407B
oklch(37.6% 0.112 256.2)
-
Step 950
950
#0C2648
oklch(26.9% 0.071 256.4)
#024C9B 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) | #18549E | 0.026 |
| Deuteranopia (no green cones) | #004899 | 0.012 |
| Tritanopia (no blue cones) | #005F6C | 0.107 |
| Achromatopsia (no color) | #4E4E4E | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #024C9B
#024C9B
oklch(42.6% 0.144 256)
- #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 #024C9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.023
- Dusk Blue #26538D ΔE 0.039
- Light Navy #155084 ΔE 0.042
- Deep Sea Blue #015482 ΔE 0.051
- Sapphire #2138AB ΔE 0.056
- Twilight Blue #0A437A ΔE 0.058
- Blueberry #464196 ΔE 0.063
- Light Navy Blue #2E5A88 ΔE 0.064
Use #024C9B 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.