#01718B
Closest named color: Sea Blue (#047495). oklch(50.8% 0.093 221.2), rgb(1, 113, 139).
Aa
White text reads best on this color (5.62:1).
About this color
#01718B is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 51%, its chroma 0.093 and its hue 221°. Its hue sits on the cool side of the wheel. The nearest named color is Sea Blue (#047495), ΔE 0.017 away. White text reads best on it, at 5.62:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Sea Blue (#047495) |
| Black text | 3.73:1 |
| White text | 5.62:1 |
Values
| HEX | #01718B |
| RGB | rgb(1, 113, 139) |
| HSL | hsl(191, 99%, 27%) |
| OKLCH | oklch(50.8% 0.093 221.2) |
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 #01718B | 5.62:1 | AA | Lc -82.8 | Fine for body text |
| Black text on #01718B | 3.73:1 | AA large text | Lc 26.5 | Dividers and decoration only |
| #01718B text on white | 5.62:1 | AA | Lc 77.5 | Fine for body text |
| #01718B text on black | 3.73:1 | AA large text | Lc -24.2 | 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 700.
-
Step 50
50
#F1F6F8
oklch(97% 0.006 223.5)
-
Step 100
100
#E1ECF0
oklch(93.6% 0.013 221.4)
-
Step 200
200
#C8DDE5
oklch(88.4% 0.025 222.6)
-
Step 300
300
#A1C8D5
oklch(80.9% 0.045 220.1)
-
Step 400
400
#6CABC0
oklch(70.6% 0.072 221.2)
-
Step 500
500
#3E96B1
oklch(63.1% 0.092 221.4)
-
Step 600
600
#0A809D
oklch(55.6% 0.1 221.5)
-
Step 700
700 (this color)
#01718B
oklch(50.8% 0.093 221.2)
-
Step 800
800
#04586D
oklch(42.7% 0.077 221.7)
-
Step 900
900
#134958
oklch(37.8% 0.06 220.4)
-
Step 950
950
#0E2B34
oklch(27.2% 0.038 221.3)
#01718B 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) | #626E8C | 0.076 |
| Deuteranopia (no green cones) | #52628B | 0.068 |
| Tritanopia (no blue cones) | #007979 | 0.044 |
| Achromatopsia (no color) | #676767 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #01718B
#01718B
oklch(50.8% 0.093 221.2)
- #92523A
#92523A
oklch(50.8% 0.093 41.1)
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 #01718B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Blue #047495 ΔE 0.017
- Ocean Blue #03719C ΔE 0.028
- Ocean #017B92 ΔE 0.030
- Deep Aqua #08787F ΔE 0.033
- Peacock Blue #016795 ΔE 0.038
- Deep Turquoise #017374 ΔE 0.040
- Dark Aquamarine #017371 ΔE 0.045
- Bluegreen #017A79 ΔE 0.046
Use #01718B 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.