#043EBC
Closest named color: Blue Blue (#2242C7). oklch(42.8% 0.204 262.8), rgb(4, 62, 188).
Aa
White text reads best on this color (8.67:1).
About this color
#043EBC is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.204 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.029 away. White text reads best on it, at 8.67:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.204) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.42:1 |
| White text | 8.67:1 |
Values
| HEX | #043EBC |
| RGB | rgb(4, 62, 188) |
| HSL | hsl(221, 96%, 38%) |
| OKLCH | oklch(42.8% 0.204 262.8) |
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 #043EBC | 8.67:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #043EBC | 2.42:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #043EBC text on white | 8.67:1 | AAA | Lc 88.6 | Fine for body text |
| #043EBC text on black | 2.42:1 | Fails | Lc -13.5 | 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 800.
-
Step 50
50
#F1F6FF
oklch(97.2% 0.013 262.4)
-
Step 100
100
#DFEAFF
oklch(93.5% 0.031 263.5)
-
Step 200
200
#C6DAFF
oklch(88.5% 0.056 262.8)
-
Step 300
300
#A0C1FF
oklch(80.9% 0.095 262.7)
-
Step 400
400
#6C9EFF
oklch(70.7% 0.152 262.5)
-
Step 500
500
#4581FF
oklch(63.1% 0.198 262.9)
-
Step 600
600
#1861FF
oklch(55.7% 0.244 262.7)
-
Step 700
700
#004AE7
oklch(49.1% 0.243 262.8)
-
Step 800
800 (this color)
#043EBC
oklch(42.8% 0.204 262.8)
-
Step 900
900
#0D3794
oklch(37.6% 0.159 262.9)
-
Step 950
950
#092257
oklch(27.1% 0.101 262.6)
#043EBC 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) | #0054C0 | 0.052 |
| Deuteranopia (no green cones) | #0043BA | 0.011 |
| Tritanopia (no blue cones) | #006177 | 0.156 |
| Achromatopsia (no color) | #4B4B4B | 0.205 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #043EBC
#043EBC
oklch(42.8% 0.204 262.8)
- #664A00
#664A00
oklch(42.8% 0.088 83.6)
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 #043EBC, closest first.
No curated palette has a color within ΔE 0.04 of #043EBC.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.029
- Sapphire #2138AB ΔE 0.033
- Majorelle Blue #3F37C9 ΔE 0.055
- True Blue #010FCC ΔE 0.068
- Ultramarine Blue #1805DB ΔE 0.074
- Indigo Blue #3A18B1 ΔE 0.074
- Medium Blue #0000CD ΔE 0.076
- Cobalt #1E488F ΔE 0.079
Use #043EBC 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.