#01588E
Closest named color: Dusk Blue (#26538D). oklch(44.6% 0.113 245.6), rgb(1, 88, 142).
Aa
White text reads best on this color (7.53:1).
About this color
#01588E is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.113 and its hue 246°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.021 away. White text reads best on it, at 7.53:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.78:1 |
| White text | 7.53:1 |
Values
| HEX | #01588E |
| RGB | rgb(1, 88, 142) |
| HSL | hsl(203, 99%, 28%) |
| OKLCH | oklch(44.6% 0.113 245.6) |
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 #01588E | 7.53:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #01588E | 2.78:1 | Fails | Lc 18.4 | Dividers and decoration only |
| #01588E text on white | 7.53:1 | AAA | Lc 85.6 | Fine for body text |
| #01588E text on black | 2.78:1 | Fails | Lc -16.5 | 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
#E0ECF6
oklch(93.7% 0.019 243)
-
Step 200
200
#C6DCF0
oklch(88.4% 0.036 245.7)
-
Step 300
300
#9EC6E9
oklch(81% 0.065 245.1)
-
Step 400
400
#66A7DE
oklch(70.7% 0.105 245.6)
-
Step 500
500
#3490D5
oklch(63.1% 0.134 245.2)
-
Step 600
600
#0078C0
oklch(55.5% 0.142 245.8)
-
Step 700
700
#0065A2
oklch(49% 0.125 245.5)
-
Step 800
800 (this color)
#01588E
oklch(44.6% 0.113 245.6)
-
Step 900
900
#0C456D
oklch(37.7% 0.088 245.4)
-
Step 950
950
#0B2940
oklch(27.2% 0.055 245.2)
#01588E 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) | #3D5B90 | 0.044 |
| Deuteranopia (no green cones) | #294F8D | 0.030 |
| Tritanopia (no blue cones) | #00656C | 0.078 |
| Achromatopsia (no color) | #545454 | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #01588E
#01588E
oklch(44.6% 0.113 245.6)
- #794700
#794700
oklch(44.7% 0.1 65.7)
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 #01588E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.021
- Deep Sea Blue #015482 ΔE 0.022
- Light Navy #155084 ΔE 0.026
- Light Navy Blue #2E5A88 ΔE 0.028
- Denim Blue #3B5B92 ΔE 0.042
- Peacock Blue #016795 ΔE 0.045
- Cobalt #1E488F ΔE 0.046
- Denim #3B638C ΔE 0.055
Use #01588E 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.