#043E8F
Closest named color: Cobalt (#1E488F). oklch(38.5% 0.145 259.1), rgb(4, 62, 143).
Aa
White text reads best on this color (10.04:1).
About this color
#043E8F is a dark, vivid blue. In OKLCH its lightness is 38%, its chroma 0.145 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.034 away. White text reads best on it, at 10.04:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.09:1 |
| White text | 10.04:1 |
Values
| HEX | #043E8F |
| RGB | rgb(4, 62, 143) |
| HSL | hsl(215, 95%, 29%) |
| OKLCH | oklch(38.5% 0.145 259.1) |
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 #043E8F | 10.04:1 | AAA | Lc -96.8 | Preferred for body text |
| Black text on #043E8F | 2.09:1 | Fails | Lc 11.4 | Not readable |
| #043E8F text on white | 10.04:1 | AAA | Lc 92.6 | Preferred for body text |
| #043E8F text on black | 2.09:1 | Fails | Lc -9.9 | 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
#C3DBFF
oklch(88.5% 0.056 258.4)
-
Step 300
300
#9BC2FF
oklch(80.8% 0.097 259.2)
-
Step 400
400
#63A0FF
oklch(70.7% 0.154 259)
-
Step 500
500
#3484FF
oklch(63.1% 0.199 259.1)
-
Step 600
600
#0069EF
oklch(55.6% 0.218 259.2)
-
Step 700
700
#0058CA
oklch(49.1% 0.191 259.1)
-
Step 800
800
#0048A8
oklch(42.8% 0.167 259.1)
-
Step 900
900 (this color)
#043E8F
oklch(38.5% 0.145 259.1)
-
Step 950
950
#062452
oklch(27% 0.091 259.1)
#043E8F 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) | #004892 | 0.027 |
| Deuteranopia (no green cones) | #003C8D | 0.007 |
| Tritanopia (no blue cones) | #005260 | 0.109 |
| Achromatopsia (no color) | #424242 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043E8F
#043E8F
oklch(38.5% 0.145 259.1)
- #5A3E00
#5A3E00
oklch(38.6% 0.08 79.8)
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 #043E8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.034
- Twilight Blue #0A437A ΔE 0.039
- Sapphire #2138AB ΔE 0.051
- Light Navy #155084 ΔE 0.059
- Marine Blue #01386A ΔE 0.065
- Dusk Blue #26538D ΔE 0.068
- Deep Sea Blue #015482 ΔE 0.070
- Blueberry #464196 ΔE 0.071
Use #043E8F 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.