#02428B
Closest named color: Cobalt (#1E488F). oklch(39% 0.135 256.7), rgb(2, 66, 139).
Aa
White text reads best on this color (9.74:1).
About this color
#02428B is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.135 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.026 away. White text reads best on it, at 9.74:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.135) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.15:1 |
| White text | 9.74:1 |
Values
| HEX | #02428B |
| RGB | rgb(2, 66, 139) |
| HSL | hsl(212, 97%, 28%) |
| OKLCH | oklch(39% 0.135 256.7) |
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 #02428B | 9.74:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #02428B | 2.15:1 | Fails | Lc 12.0 | Not readable |
| #02428B text on white | 9.74:1 | AAA | Lc 91.9 | Preferred for body text |
| #02428B text on black | 2.15:1 | Fails | Lc -10.5 | 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
#F0F6FF
oklch(97.1% 0.014 258.3)
-
Step 100
100
#DEEBFE
oklch(93.6% 0.029 257.8)
-
Step 200
200
#C2DBFF
oklch(88.5% 0.057 257.5)
-
Step 300
300
#98C3FF
oklch(80.9% 0.097 256.8)
-
Step 400
400
#5DA1FF
oklch(70.7% 0.155 256.9)
-
Step 500
500
#2386FF
oklch(63.2% 0.2 256.6)
-
Step 600
600
#006EE2
oklch(55.6% 0.196 256.8)
-
Step 700
700
#005CBF
oklch(49% 0.172 256.8)
-
Step 800
800
#004B9E
oklch(42.6% 0.15 256.7)
-
Step 900
900 (this color)
#02428B
oklch(39% 0.135 256.7)
-
Step 950
950
#05254F
oklch(27% 0.086 257)
#02428B 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) | #0E4A8E | 0.025 |
| Deuteranopia (no green cones) | #003F8A | 0.009 |
| Tritanopia (no blue cones) | #005460 | 0.101 |
| Achromatopsia (no color) | #444444 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #02428B
#02428B
oklch(39% 0.135 256.7)
- #5D3E00
#5D3E00
oklch(39% 0.082 77)
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 #02428B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.026
- Twilight Blue #0A437A ΔE 0.029
- Light Navy #155084 ΔE 0.047
- Deep Sea Blue #015482 ΔE 0.058
- Dusk Blue #26538D ΔE 0.058
- Sapphire #2138AB ΔE 0.060
- Marine Blue #01386A ΔE 0.061
- Blueberry #464196 ΔE 0.070
Use #02428B 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.