#17566C
Closest named color: Petrol (#005F6A). oklch(42.5% 0.071 226), rgb(23, 86, 108).
Aa
White text reads best on this color (8.12:1).
About this color
#17566C is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 42%, its chroma 0.071 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.030 away. White text reads best on it, at 8.12:1.
| Hue family | Teals and cyans |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.58:1 |
| White text | 8.12:1 |
Values
| HEX | #17566C |
| RGB | rgb(23, 86, 108) |
| HSL | hsl(196, 65%, 26%) |
| OKLCH | oklch(42.5% 0.071 226) |
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 #17566C | 8.12:1 | AAA | Lc -92.5 | Preferred for body text |
| Black text on #17566C | 2.58:1 | Fails | Lc 16.2 | Dividers and decoration only |
| #17566C text on white | 8.12:1 | AAA | Lc 87.8 | Fine for body text |
| #17566C text on black | 2.58:1 | Fails | Lc -14.3 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CADDE5
oklch(88.6% 0.023 224.9)
-
Step 300
300
#A5C7D5
oklch(80.9% 0.041 224.8)
-
Step 400
400
#73AAC1
oklch(70.8% 0.067 226.1)
-
Step 500
500
#4A94B1
oklch(63.1% 0.085 226.2)
-
Step 600
600
#277E9D
oklch(55.6% 0.093 226.3)
-
Step 700
700
#186A86
oklch(49.1% 0.086 226.4)
-
Step 800
800 (this color)
#17566C
oklch(42.5% 0.071 226)
-
Step 900
900
#1C4858
oklch(37.8% 0.055 225.1)
-
Step 950
950
#122A34
oklch(27.1% 0.035 227.4)
#17566C 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) | #4A546D | 0.053 |
| Deuteranopia (no green cones) | #3F4C6C | 0.047 |
| Tritanopia (no blue cones) | #005C5D | 0.038 |
| Achromatopsia (no color) | #505050 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17566C
#17566C
oklch(42.5% 0.071 226)
- #6E412C
#6E412C
oklch(42.4% 0.071 45.4)
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 #17566C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.030
- Deep Teal #00555A ΔE 0.033
- Deep Sea Blue #015482 ΔE 0.040
- YInMn Blue #415A77 ΔE 0.048
- Dark Slate Gray #2F4F4F ΔE 0.048
- Light Navy #155084 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.051
- Light Navy Blue #2E5A88 ΔE 0.052
Use #17566C 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.