#01588B
Closest named color: Deep Sea Blue (#015482). oklch(44.4% 0.109 244.2), rgb(1, 88, 139).
Aa
White text reads best on this color (7.58:1).
About this color
#01588B is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.109 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.018 away. White text reads best on it, at 7.58:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.76:1 |
| White text | 7.58:1 |
Values
| HEX | #01588B |
| RGB | rgb(1, 88, 139) |
| HSL | hsl(202, 99%, 27%) |
| OKLCH | oklch(44.4% 0.109 244.2) |
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 #01588B | 7.58:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #01588B | 2.76:1 | Fails | Lc 18.3 | Dividers and decoration only |
| #01588B text on white | 7.58:1 | AAA | Lc 85.8 | Fine for body text |
| #01588B text on black | 2.76:1 | Fails | Lc -16.3 | 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
#C6DCEF
oklch(88.4% 0.035 244.2)
-
Step 300
300
#9EC6E7
oklch(80.9% 0.063 243.5)
-
Step 400
400
#66A7DC
oklch(70.6% 0.103 244.6)
-
Step 500
500
#3590D2
oklch(63% 0.131 244.3)
-
Step 600
600
#0079BD
oklch(55.5% 0.138 244.2)
-
Step 700
700
#0066A0
oklch(49.2% 0.121 244)
-
Step 800
800 (this color)
#01588B
oklch(44.4% 0.109 244.2)
-
Step 900
900
#0D456B
oklch(37.6% 0.085 244.3)
-
Step 950
950
#0B293F
oklch(27.1% 0.054 244.1)
#01588B 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) | #3F5A8D | 0.046 |
| Deuteranopia (no green cones) | #2C4F8A | 0.032 |
| Tritanopia (no blue cones) | #00656B | 0.076 |
| Achromatopsia (no color) | #545454 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #01588B
#01588B
oklch(44.4% 0.109 244.2)
- #794500
#794500
oklch(44.3% 0.1 63.8)
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 #01588B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.018
- Dusk Blue #26538D ΔE 0.022
- Light Navy #155084 ΔE 0.024
- Light Navy Blue #2E5A88 ΔE 0.027
- Denim Blue #3B5B92 ΔE 0.044
- Peacock Blue #016795 ΔE 0.046
- Cobalt #1E488F ΔE 0.048
- Denim #3B638C ΔE 0.055
Use #01588B 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.