#043987
Closest named color: Twilight Blue (#0A437A). oklch(36.7% 0.141 259.6), rgb(4, 57, 135).
Aa
White text reads best on this color (10.82:1).
About this color
#043987 is a dark, vivid blue. In OKLCH its lightness is 37%, its chroma 0.141 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.038 away. White text reads best on it, at 10.82:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.94:1 |
| White text | 10.82:1 |
Values
| HEX | #043987 |
| RGB | rgb(4, 57, 135) |
| HSL | hsl(216, 94%, 27%) |
| OKLCH | oklch(36.7% 0.141 259.6) |
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 #043987 | 10.82:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #043987 | 1.94:1 | Fails | Lc 9.6 | Not readable |
| #043987 text on white | 10.82:1 | AAA | Lc 94.3 | Preferred for body text |
| #043987 text on black | 1.94:1 | Fails | Lc -8.2 | 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
#C4DBFF
oklch(88.6% 0.056 259.3)
-
Step 300
300
#9CC2FF
oklch(80.9% 0.096 259.7)
-
Step 400
400
#65A0FF
oklch(70.8% 0.153 259.5)
-
Step 500
500
#3684FF
oklch(63.2% 0.199 259.4)
-
Step 600
600
#0068F1
oklch(55.5% 0.221 259.6)
-
Step 700
700
#0057CD
oklch(49.1% 0.196 259.6)
-
Step 800
800
#0047AA
oklch(42.8% 0.171 259.6)
-
Step 900
900 (this color)
#043987
oklch(36.7% 0.141 259.6)
-
Step 950
950
#082451
oklch(27% 0.089 259.7)
#043987 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) | #00438A | 0.028 |
| Deuteranopia (no green cones) | #003886 | 0.004 |
| Tritanopia (no blue cones) | #004D5A | 0.107 |
| Achromatopsia (no color) | #3D3D3D | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043987
#043987
oklch(36.7% 0.141 259.6)
- #543900
#543900
oklch(36.6% 0.076 78.9)
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 #043987, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.038
- Cobalt #1E488F ΔE 0.049
- Marine Blue #01386A ΔE 0.050
- Sapphire #2138AB ΔE 0.064
- Light Navy #155084 ΔE 0.070
- Royal #0C1793 ΔE 0.071
- Marine #042E60 ΔE 0.073
- Dark Slate Blue #483D8B ΔE 0.079
Use #043987 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.