#01578F
Closest named color: Dusk Blue (#26538D). oklch(44.4% 0.115 246.7), rgb(1, 87, 143).
Aa
White text reads best on this color (7.60:1).
About this color
#01578F is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.115 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.020 away. White text reads best on it, at 7.60:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.76:1 |
| White text | 7.60:1 |
Values
| HEX | #01578F |
| RGB | rgb(1, 87, 143) |
| HSL | hsl(204, 99%, 28%) |
| OKLCH | oklch(44.4% 0.115 246.7) |
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 #01578F | 7.60:1 | AAA | Lc -90.7 | Preferred for body text |
| Black text on #01578F | 2.76:1 | Fails | Lc 18.2 | Dividers and decoration only |
| #01578F text on white | 7.60:1 | AAA | Lc 85.8 | Fine for body text |
| #01578F text on black | 2.76:1 | Fails | Lc -16.2 | Dividers and decoration only |
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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C6DCF1
oklch(88.5% 0.037 247)
-
Step 300
300
#9EC5EA
oklch(80.8% 0.067 247.3)
-
Step 400
400
#66A7E0
oklch(70.8% 0.107 246.5)
-
Step 500
500
#348FD7
oklch(63% 0.138 246.5)
-
Step 600
600
#0078C2
oklch(55.6% 0.145 246.5)
-
Step 700
700
#0065A4
oklch(49.2% 0.127 246.3)
-
Step 800
800 (this color)
#01578F
oklch(44.4% 0.115 246.7)
-
Step 900
900
#0D446E
oklch(37.6% 0.09 247.1)
-
Step 950
950
#0B2840
oklch(26.9% 0.056 247)
#01578F 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) | #3B5A91 | 0.042 |
| Deuteranopia (no green cones) | #264F8E | 0.027 |
| Tritanopia (no blue cones) | #00656C | 0.082 |
| Achromatopsia (no color) | #545454 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #01578F
#01578F
oklch(44.4% 0.115 246.7)
- #774700
#774700
oklch(44.4% 0.098 67)
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 #01578F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.020
- Deep Sea Blue #015482 ΔE 0.022
- Light Navy #155084 ΔE 0.025
- Light Navy Blue #2E5A88 ΔE 0.030
- Cobalt #1E488F ΔE 0.043
- Denim Blue #3B5B92 ΔE 0.043
- Peacock Blue #016795 ΔE 0.048
- Denim #3B638C ΔE 0.057
Use #01578F 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.