#01517B
Closest named color: Deep Sea Blue (#015482). oklch(41.6% 0.096 241), rgb(1, 81, 123).
Aa
White text reads best on this color (8.52:1).
About this color
#01517B is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.096 and its hue 241°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sea Blue (#015482), ΔE 0.014 away. White text reads best on it, at 8.52:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Deep Sea Blue (#015482) |
| Black text | 2.46:1 |
| White text | 8.52:1 |
Values
| HEX | #01517B |
| RGB | rgb(1, 81, 123) |
| HSL | hsl(201, 98%, 24%) |
| OKLCH | oklch(41.6% 0.096 241) |
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 #01517B | 8.52:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #01517B | 2.46:1 | Fails | Lc 15.2 | Dividers and decoration only |
| #01517B text on white | 8.52:1 | AAA | Lc 88.8 | Fine for body text |
| #01517B text on black | 2.46:1 | Fails | Lc -13.4 | 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
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#E1ECF4
oklch(93.7% 0.016 239.1)
-
Step 200
200
#C8DCEC
oklch(88.4% 0.031 242)
-
Step 300
300
#A1C6E2
oklch(80.9% 0.056 241)
-
Step 400
400
#6BA8D4
oklch(70.7% 0.09 241)
-
Step 500
500
#3E91C8
oklch(63% 0.115 241.1)
-
Step 600
600
#0F7BB5
oklch(55.7% 0.125 240.7)
-
Step 700
700
#00679B
oklch(49.1% 0.115 241)
-
Step 800
800 (this color)
#01517B
oklch(41.6% 0.096 241)
-
Step 900
900
#144666
oklch(37.8% 0.075 241.4)
-
Step 950
950
#0E293B
oklch(27% 0.047 240.8)
#01517B 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) | #3D527D | 0.047 |
| Deuteranopia (no green cones) | #2D487A | 0.035 |
| Tritanopia (no blue cones) | #005B60 | 0.063 |
| Achromatopsia (no color) | #4C4C4C | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #01517B
#01517B
oklch(41.6% 0.096 241)
- #713D00
#713D00
oklch(41.6% 0.097 60.6)
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 #01517B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sea Blue #015482 ΔE 0.014
- Light Navy #155084 ΔE 0.019
- Dusk Blue #26538D ΔE 0.038
- Twilight Blue #0A437A ΔE 0.042
- Light Navy Blue #2E5A88 ΔE 0.046
- Cobalt #1E488F ΔE 0.048
- Dark Grey Blue #29465B ΔE 0.058
- Petrol #005F6A ΔE 0.059
Use #01517B 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.