#043787
Closest named color: Twilight Blue (#0A437A). oklch(36.2% 0.143 260.2), rgb(4, 55, 135).
Aa
White text reads best on this color (11.04:1).
About this color
#043787 is a dark, vivid blue. In OKLCH its lightness is 36%, its chroma 0.143 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.043 away. White text reads best on it, at 11.04:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.90:1 |
| White text | 11.04:1 |
Values
| HEX | #043787 |
| RGB | rgb(4, 55, 135) |
| HSL | hsl(217, 94%, 27%) |
| OKLCH | oklch(36.2% 0.143 260.2) |
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 #043787 | 11.04:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #043787 | 1.90:1 | Fails | Lc 9.1 | Not readable |
| #043787 text on white | 11.04:1 | AAA | Lc 94.8 | Preferred for body text |
| #043787 text on black | 1.90:1 | Fails | Lc -7.8 | 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
#DEEBFF
oklch(93.6% 0.031 258.9)
-
Step 200
200
#C4DAFF
oklch(88.4% 0.057 260.8)
-
Step 300
300
#9DC2FF
oklch(81% 0.096 260.2)
-
Step 400
400
#669FFF
oklch(70.7% 0.154 260.3)
-
Step 500
500
#3983FF
oklch(63.1% 0.199 260.2)
-
Step 600
600
#0066F6
oklch(55.6% 0.23 260.3)
-
Step 700
700
#0055D0
oklch(49% 0.203 260.3)
-
Step 800
800
#0046AD
oklch(42.8% 0.176 260.1)
-
Step 900
900 (this color)
#043787
oklch(36.2% 0.143 260.2)
-
Step 950
950
#082452
oklch(27.1% 0.091 260)
#043787 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) | #00428A | 0.030 |
| Deuteranopia (no green cones) | #003685 | 0.005 |
| Tritanopia (no blue cones) | #004B59 | 0.108 |
| Achromatopsia (no color) | #3C3C3C | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043787
#043787
oklch(36.2% 0.143 260.2)
- #523800
#523800
oklch(36.1% 0.075 79.6)
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 #043787, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.043
- Marine Blue #01386A ΔE 0.050
- Cobalt #1E488F ΔE 0.054
- Sapphire #2138AB ΔE 0.064
- Royal #0C1793 ΔE 0.066
- Marine #042E60 ΔE 0.071
- Light Navy #155084 ΔE 0.075
- Midnight Blue #191970 ΔE 0.081
Use #043787 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.