#02315B
Closest named color: Marine (#042E60). oklch(31% 0.089 251.3), rgb(2, 49, 91).
Aa
White text reads best on this color (13.18:1).
About this color
#02315B is a dark, moderately saturated blue. In OKLCH its lightness is 31%, its chroma 0.089 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Marine (#042E60), ΔE 0.014 away. White text reads best on it, at 13.18:1.
| Hue family | Blues |
| Lightness | dark (31%) |
| Chroma | moderately saturated (0.089) |
| Temperature | cool |
| Nearest name | Marine (#042E60) |
| Black text | 1.59:1 |
| White text | 13.18:1 |
Values
| HEX | #02315B |
| RGB | rgb(2, 49, 91) |
| HSL | hsl(208, 96%, 18%) |
| OKLCH | oklch(31% 0.089 251.3) |
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 #02315B | 13.18:1 | AAA | Lc -102.4 | Preferred for body text |
| Black text on #02315B | 1.59:1 | Fails | Lc 0.0 | Not readable |
| #02315B text on white | 13.18:1 | AAA | Lc 99.1 | Preferred for body text |
| #02315B text on black | 1.59:1 | Fails | Lc 0.0 | 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 950.
-
Step 50
50
#EFF6FF
oklch(97% 0.014 254.6)
-
Step 100
100
#DCECFE
oklch(93.7% 0.03 251.3)
-
Step 200
200
#BEDDFF
oklch(88.6% 0.058 250.9)
-
Step 300
300
#90C5FF
oklch(80.8% 0.1 251.3)
-
Step 400
400
#4BA4FF
oklch(70.6% 0.158 251.5)
-
Step 500
500
#008BF4
oklch(63.1% 0.185 251.3)
-
Step 600
600
#0075CE
oklch(55.7% 0.162 251.1)
-
Step 700
700
#0062AF
oklch(49.2% 0.144 251.3)
-
Step 800
800
#005090
oklch(42.7% 0.125 251.1)
-
Step 900
900
#004279
oklch(37.6% 0.11 251.3)
-
Step 950
950 (this color)
#02315B
oklch(31% 0.089 251.3)
#02315B 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) | #1B345D | 0.024 |
| Deuteranopia (no green cones) | #092D5A | 0.012 |
| Tritanopia (no blue cones) | #003B41 | 0.065 |
| Achromatopsia (no color) | #303030 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #02315B
#02315B
oklch(31% 0.089 251.3)
- #452A00
#452A00
oklch(31.1% 0.067 72)
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 #02315B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine #042E60 ΔE 0.014
- Prussian Blue #1D3557 ΔE 0.028
- Marine Blue #01386A ΔE 0.032
- Midnight Green #073B4C ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.053
- Space Cadet #2B2D42 ΔE 0.058
- Gunmetal #293241 ΔE 0.060
- Oxford Blue #1B263B ΔE 0.063
Use #02315B 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.