#0A43A4
Closest named color: Sapphire (#2138AB). oklch(41.5% 0.166 261), rgb(10, 67, 164).
Aa
White text reads best on this color (8.92:1).
About this color
#0A43A4 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.166 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.029 away. White text reads best on it, at 8.92:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.166) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.35:1 |
| White text | 8.92:1 |
Values
| HEX | #0A43A4 |
| RGB | rgb(10, 67, 164) |
| HSL | hsl(218, 89%, 34%) |
| OKLCH | oklch(41.5% 0.166 261) |
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 #0A43A4 | 8.92:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #0A43A4 | 2.35:1 | Fails | Lc 14.3 | Not readable |
| #0A43A4 text on white | 8.92:1 | AAA | Lc 89.7 | Fine for body text |
| #0A43A4 text on black | 2.35:1 | Fails | Lc -12.6 | 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
#DFEBFD
oklch(93.6% 0.028 258.4)
-
Step 200
200
#C5DAFE
oklch(88.4% 0.055 261.2)
-
Step 300
300
#9EC2FF
oklch(81% 0.095 260.8)
-
Step 400
400
#689FFF
oklch(70.7% 0.153 260.8)
-
Step 500
500
#3D83FF
oklch(63.2% 0.198 260.8)
-
Step 600
600
#1A68EF
oklch(55.7% 0.216 261)
-
Step 700
700
#0C55D0
oklch(49.1% 0.201 261)
-
Step 800
800 (this color)
#0A43A4
oklch(41.5% 0.166 261)
-
Step 900
900
#143D85
oklch(37.8% 0.129 260.8)
-
Step 950
950
#0D244E
oklch(27% 0.083 261.2)
#0A43A4 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) | #0051A7 | 0.036 |
| Deuteranopia (no green cones) | #0043A2 | 0.005 |
| Tritanopia (no blue cones) | #005C6D | 0.126 |
| Achromatopsia (no color) | #4A4A4A | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0A43A4
#0A43A4
oklch(41.5% 0.166 261)
- #634600
#634600
oklch(41.5% 0.086 81.5)
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 #0A43A4, closest first.
No curated palette has a color within ΔE 0.04 of #0A43A4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.029
- Cobalt #1E488F ΔE 0.040
- Blue Blue #2242C7 ΔE 0.059
- Blueberry #464196 ΔE 0.064
- Dusk Blue #26538D ΔE 0.065
- Light Navy #155084 ΔE 0.067
- Twilight Blue #0A437A ΔE 0.070
- Dark Slate Blue #483D8B ΔE 0.075
Use #0A43A4 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.