#023C57
Closest named color: Midnight Green (#073B4C). oklch(33.7% 0.072 236.3), rgb(2, 60, 87).
Aa
White text reads best on this color (11.75:1).
About this color
#023C57 is a dark, moderately saturated blue. In OKLCH its lightness is 34%, its chroma 0.072 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.019 away. White text reads best on it, at 11.75:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.78:1 |
| White text | 11.75:1 |
Values
| HEX | #023C57 |
| RGB | rgb(2, 60, 87) |
| HSL | hsl(199, 96%, 17%) |
| OKLCH | oklch(33.7% 0.072 236.3) |
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 #023C57 | 11.75:1 | AAA | Lc -100.2 | Preferred for body text |
| Black text on #023C57 | 1.78:1 | Fails | Lc 7.3 | Not readable |
| #023C57 text on white | 11.75:1 | AAA | Lc 96.6 | Preferred for body text |
| #023C57 text on black | 1.78:1 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1ECF3
oklch(93.7% 0.015 235.4)
-
Step 200
200
#C7DDEB
oklch(88.6% 0.03 235.7)
-
Step 300
300
#A0C7DF
oklch(81% 0.054 235.3)
-
Step 400
400
#6AA9CF
oklch(70.7% 0.086 236.2)
-
Step 500
500
#3B93C3
oklch(63.1% 0.11 236.2)
-
Step 600
600
#047CAF
oklch(55.5% 0.119 236.4)
-
Step 700
700
#006894
oklch(49% 0.106 236.4)
-
Step 800
800
#01557A
oklch(42.6% 0.092 236.6)
-
Step 900
900 (this color)
#023C57
oklch(33.7% 0.072 236.3)
-
Step 950
950
#0D2A3A
oklch(27.1% 0.045 236.1)
#023C57 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) | #2F3C58 | 0.041 |
| Deuteranopia (no green cones) | #243557 | 0.033 |
| Tritanopia (no blue cones) | #004345 | 0.045 |
| Achromatopsia (no color) | #383838 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #023C57
#023C57
oklch(33.7% 0.072 236.3)
- #522C0C
#522C0C
oklch(33.6% 0.071 56.5)
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 #023C57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.019
- Dark Blue Grey #1F3B4D ΔE 0.025
- Prussian Blue #1D3557 ΔE 0.027
- Marine Blue #01386A ΔE 0.038
- Charcoal #264653 ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.049
- Marine #042E60 ΔE 0.050
- Gunmetal #293241 ΔE 0.051
Use #023C57 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.