#043B57
Closest named color: Midnight Green (#073B4C). oklch(33.5% 0.072 238.2), rgb(4, 59, 87).
Aa
White text reads best on this color (11.87:1).
About this color
#043B57 is a dark, moderately saturated blue. In OKLCH its lightness is 33%, its chroma 0.072 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Midnight Green (#073B4C), ΔE 0.020 away. White text reads best on it, at 11.87:1.
| Hue family | Blues |
| Lightness | dark (33%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Midnight Green (#073B4C) |
| Black text | 1.76:1 |
| White text | 11.87:1 |
Values
| HEX | #043B57 |
| RGB | rgb(4, 59, 87) |
| HSL | hsl(200, 91%, 18%) |
| OKLCH | oklch(33.5% 0.072 238.2) |
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 #043B57 | 11.87:1 | AAA | Lc -100.5 | Preferred for body text |
| Black text on #043B57 | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #043B57 text on white | 11.87:1 | AAA | Lc 96.8 | Preferred for body text |
| #043B57 text on black | 1.76:1 | 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
#C8DCEB
oklch(88.4% 0.03 240.2)
-
Step 300
300
#A1C6E0
oklch(80.8% 0.054 239)
-
Step 400
400
#6BA9D0
oklch(70.8% 0.086 237.3)
-
Step 500
500
#3E92C4
oklch(63% 0.11 238.3)
-
Step 600
600
#107CB1
oklch(55.7% 0.12 238.1)
-
Step 700
700
#006897
oklch(49.1% 0.109 238.1)
-
Step 800
800
#07557B
oklch(42.7% 0.092 238)
-
Step 900
900 (this color)
#043B57
oklch(33.5% 0.072 238.2)
-
Step 950
950
#0E293A
oklch(26.9% 0.046 239.3)
#043B57 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) | #2D3B58 | 0.038 |
| Deuteranopia (no green cones) | #223457 | 0.030 |
| Tritanopia (no blue cones) | #004245 | 0.045 |
| Achromatopsia (no color) | #373737 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043B57
#043B57
oklch(33.5% 0.072 238.2)
- #512C09
#512C09
oklch(33.5% 0.071 58.8)
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 #043B57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Midnight Green #073B4C ΔE 0.020
- Prussian Blue #1D3557 ΔE 0.025
- Dark Blue Grey #1F3B4D ΔE 0.025
- Marine Blue #01386A ΔE 0.037
- Marine #042E60 ΔE 0.047
- Gunmetal #293241 ΔE 0.050
- Charcoal #264653 ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.051
Use #043B57 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.