#17566E
Closest named color: Petrol (#005F6A). oklch(42.6% 0.073 228.2), rgb(23, 86, 110).
Aa
White text reads best on this color (8.09:1).
About this color
#17566E is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 43%, its chroma 0.073 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.032 away. White text reads best on it, at 8.09:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.59:1 |
| White text | 8.09:1 |
Values
| HEX | #17566E |
| RGB | rgb(23, 86, 110) |
| HSL | hsl(197, 65%, 26%) |
| OKLCH | oklch(42.6% 0.073 228.2) |
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 #17566E | 8.09:1 | AAA | Lc -92.4 | Preferred for body text |
| Black text on #17566E | 2.59:1 | Fails | Lc 16.3 | Dividers and decoration only |
| #17566E text on white | 8.09:1 | AAA | Lc 87.7 | Fine for body text |
| #17566E text on black | 2.59:1 | Fails | Lc -14.4 | 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
#F2F6F8
oklch(97.1% 0.005 228.8)
-
Step 100
100
#E2ECF0
oklch(93.7% 0.012 223.5)
-
Step 200
200
#CADDE6
oklch(88.6% 0.024 227.8)
-
Step 300
300
#A5C7D7
oklch(81% 0.043 228)
-
Step 400
400
#72A9C2
oklch(70.6% 0.068 228.2)
-
Step 500
500
#4A94B3
oklch(63.2% 0.087 227.9)
-
Step 600
600
#277E9F
oklch(55.7% 0.095 227.9)
-
Step 700
700
#176A88
oklch(49.1% 0.088 228)
-
Step 800
800 (this color)
#17566E
oklch(42.6% 0.073 228.2)
-
Step 900
900
#1B4759
oklch(37.6% 0.057 228.1)
-
Step 950
950
#112A34
oklch(27% 0.036 226.6)
#17566E 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) | #49546F | 0.052 |
| Deuteranopia (no green cones) | #3E4C6E | 0.046 |
| Tritanopia (no blue cones) | #005D5E | 0.041 |
| Achromatopsia (no color) | #505050 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17566E
#17566E
oklch(42.6% 0.073 228.2)
- #6F4229
#6F4229
oklch(42.7% 0.073 49)
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 #17566E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.032
- Deep Sea Blue #015482 ΔE 0.036
- Deep Teal #00555A ΔE 0.037
- Light Navy #155084 ΔE 0.046
- YInMn Blue #415A77 ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.049
- Dark Slate Gray #2F4F4F ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.052
Use #17566E 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.