#17566D
Closest named color: Petrol (#005F6A). oklch(42.5% 0.072 227.1), rgb(23, 86, 109).
Aa
White text reads best on this color (8.11:1).
About this color
#17566D is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 43%, its chroma 0.072 and its hue 227°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.031 away. White text reads best on it, at 8.11:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.072) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.58:1 |
| White text | 8.11:1 |
Values
| HEX | #17566D |
| RGB | rgb(23, 86, 109) |
| HSL | hsl(196, 65%, 26%) |
| OKLCH | oklch(42.5% 0.072 227.1) |
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 #17566D | 8.11:1 | AAA | Lc -92.5 | Preferred for body text |
| Black text on #17566D | 2.58:1 | Fails | Lc 16.2 | Dividers and decoration only |
| #17566D text on white | 8.11:1 | AAA | Lc 87.8 | Fine for body text |
| #17566D text on black | 2.58:1 | 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
#CADDE5
oklch(88.6% 0.023 224.9)
-
Step 300
300
#A5C7D6
oklch(81% 0.042 226.4)
-
Step 400
400
#73AAC1
oklch(70.8% 0.067 226.1)
-
Step 500
500
#4A94B2
oklch(63.1% 0.086 227.1)
-
Step 600
600
#277E9E
oklch(55.7% 0.094 227.1)
-
Step 700
700
#176A87
oklch(49.1% 0.087 227.1)
-
Step 800
800 (this color)
#17566D
oklch(42.5% 0.072 227.1)
-
Step 900
900
#1C4759
oklch(37.6% 0.056 228.6)
-
Step 950
950
#112A34
oklch(27% 0.036 226.6)
#17566D 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) | #4A546E | 0.053 |
| Deuteranopia (no green cones) | #3E4C6D | 0.046 |
| Tritanopia (no blue cones) | #005D5E | 0.040 |
| Achromatopsia (no color) | #505050 | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #17566D
#17566D
oklch(42.5% 0.072 227.1)
- #6F412A
#6F412A
oklch(42.5% 0.073 46.7)
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 #17566D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.031
- Deep Teal #00555A ΔE 0.035
- Deep Sea Blue #015482 ΔE 0.038
- Light Navy #155084 ΔE 0.047
- YInMn Blue #415A77 ΔE 0.047
- Dark Slate Gray #2F4F4F ΔE 0.050
- Light Navy Blue #2E5A88 ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.052
Use #17566D 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.