#17566B
Closest named color: Petrol (#005F6A). oklch(42.4% 0.07 224.8), rgb(23, 86, 107).
Aa
White text reads best on this color (8.13:1).
About this color
#17566B is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 42%, its chroma 0.070 and its hue 225°. 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 8.13:1.
| Hue family | Teals and cyans |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.070) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.57:1 |
| White text | 8.13:1 |
Values
| HEX | #17566B |
| RGB | rgb(23, 86, 107) |
| HSL | hsl(195, 65%, 25%) |
| OKLCH | oklch(42.4% 0.07 224.8) |
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 #17566B | 8.13:1 | AAA | Lc -92.5 | Preferred for body text |
| Black text on #17566B | 2.57:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #17566B text on white | 8.13:1 | AAA | Lc 87.9 | Fine for body text |
| #17566B text on black | 2.57:1 | 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
#73AAC0
oklch(70.8% 0.066 225)
-
Step 500
500
#4A94B0
oklch(63% 0.085 225.3)
-
Step 600
600
#277E9B
oklch(55.5% 0.091 224.7)
-
Step 700
700
#186A85
oklch(49% 0.085 225.5)
-
Step 800
800 (this color)
#17566B
oklch(42.4% 0.07 224.8)
-
Step 900
900
#1C4857
oklch(37.8% 0.054 223.5)
-
Step 950
950
#122A33
oklch(27% 0.034 224.8)
#17566B 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) | #4A546C | 0.054 |
| Deuteranopia (no green cones) | #3F4C6B | 0.047 |
| Tritanopia (no blue cones) | #005C5D | 0.036 |
| Achromatopsia (no color) | #4F4F4F | 0.070 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17566B
#17566B
oklch(42.4% 0.07 224.8)
- #6E412D
#6E412D
oklch(42.4% 0.07 44.4)
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 #17566B, 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 0.032
- Deep Sea Blue #015482 ΔE 0.041
- Dark Slate Gray #2F4F4F ΔE 0.047
- YInMn Blue #415A77 ΔE 0.049
- Light Navy #155084 ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.051
- Light Navy Blue #2E5A88 ΔE 0.054
Use #17566B 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.