#023370
Closest named color: Marine Blue (#01386A). oklch(33.2% 0.116 257.3), rgb(2, 51, 112).
Aa
White text reads best on this color (12.28:1).
About this color
#023370 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.116 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Marine Blue (#01386A), ΔE 0.019 away. White text reads best on it, at 12.28:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Marine Blue (#01386A) |
| Black text | 1.71:1 |
| White text | 12.28:1 |
Values
| HEX | #023370 |
| RGB | rgb(2, 51, 112) |
| HSL | hsl(213, 96%, 22%) |
| OKLCH | oklch(33.2% 0.116 257.3) |
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 #023370 | 12.28:1 | AAA | Lc -100.9 | Preferred for body text |
| Black text on #023370 | 1.71:1 | Fails | Lc 0.0 | Not readable |
| #023370 text on white | 12.28:1 | AAA | Lc 97.4 | Preferred for body text |
| #023370 text on black | 1.71:1 | 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 900.
-
Step 50
50
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#DFEBFB
oklch(93.6% 0.025 255.6)
-
Step 200
200
#C5DBFA
oklch(88.5% 0.049 256.9)
-
Step 300
300
#9DC3F9
oklch(80.9% 0.087 257.2)
-
Step 400
400
#66A2F6
oklch(70.8% 0.139 257)
-
Step 500
500
#3987F3
oklch(63.1% 0.179 257.5)
-
Step 600
600
#0B6EE1
oklch(55.6% 0.193 257.2)
-
Step 700
700
#005BC2
oklch(49% 0.177 257.5)
-
Step 800
800
#054B9E
oklch(42.7% 0.149 257.3)
-
Step 900
900 (this color)
#023370
oklch(33.2% 0.116 257.3)
-
Step 950
950
#0C264A
oklch(27.1% 0.074 257.4)
#023370 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) | #063A72 | 0.021 |
| Deuteranopia (no green cones) | #00306F | 0.009 |
| Tritanopia (no blue cones) | #00424C | 0.087 |
| Achromatopsia (no color) | #353535 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #023370
#023370
oklch(33.2% 0.116 257.3)
- #4A3000
#4A3000
oklch(33.2% 0.07 76.2)
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 #023370, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Marine Blue #01386A ΔE 0.019
- Marine #042E60 ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.049
- Twilight Blue #0A437A ΔE 0.050
- Midnight Blue #191970 ΔE 0.062
- Midnight Green #073B4C ΔE 0.073
- Dark Blue Grey #1F3B4D ΔE 0.074
- Royal #0C1793 ΔE 0.080
Use #023370 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.