#01719B
Closest named color: Ocean Blue (#03719C). oklch(51.6% 0.107 233.2), rgb(1, 113, 155).
Aa
White text reads best on this color (5.47:1).
About this color
#01719B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 52%, its chroma 0.107 and its hue 233°. Its hue sits on the cool side of the wheel. The nearest named color is Ocean Blue (#03719C), ΔE 0.002 away. White text reads best on it, at 5.47:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Ocean Blue (#03719C) |
| Black text | 3.83:1 |
| White text | 5.47:1 |
Values
| HEX | #01719B |
| RGB | rgb(1, 113, 155) |
| HSL | hsl(196, 99%, 31%) |
| OKLCH | oklch(51.6% 0.107 233.2) |
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 #01719B | 5.47:1 | AA | Lc -82.1 | Fine for body text |
| Black text on #01719B | 3.83:1 | AA large text | Lc 27.3 | Dividers and decoration only |
| #01719B text on white | 5.47:1 | AA | Lc 76.7 | Fine for body text |
| #01719B text on black | 3.83:1 | AA large text | Lc -25.0 | 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 700.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C7DDE9
oklch(88.5% 0.029 231.5)
-
Step 300
300
#A0C7DD
oklch(80.9% 0.052 233)
-
Step 400
400
#6AAACC
oklch(70.8% 0.082 232.8)
-
Step 500
500
#3B94BF
oklch(63.2% 0.105 233)
-
Step 600
600
#027DAB
oklch(55.5% 0.115 233.3)
-
Step 700
700 (this color)
#01719B
oklch(51.6% 0.107 233.2)
-
Step 800
800
#005677
oklch(42.6% 0.088 233.1)
-
Step 900
900
#114760
oklch(37.6% 0.069 233.4)
-
Step 950
950
#0D2A38
oklch(27% 0.043 232.5)
#01719B 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) | #5C709D | 0.067 |
| Deuteranopia (no green cones) | #49649A | 0.054 |
| Tritanopia (no blue cones) | #007C7F | 0.064 |
| Achromatopsia (no color) | #696969 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #01719B
#01719B
oklch(51.6% 0.107 233.2)
- #975425
#975425
oklch(51.6% 0.108 52.7)
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 #01719B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ocean Blue #03719C ΔE 0.002
- Sea Blue #047495 ΔE 0.015
- Peacock Blue #016795 ΔE 0.030
- Muted Blue #3B719F ΔE 0.031
- Ocean #017B92 ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.039
- Nice Blue #107AB0 ΔE 0.040
- Dull Blue #49759C ΔE 0.047
Use #01719B 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.