#00566B
Closest named color: Deep Teal (#00555A). oklch(42% 0.077 221.7), rgb(0, 86, 107).
Aa
White text reads best on this color (8.25:1).
About this color
#00566B is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 42%, its chroma 0.077 and its hue 222°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Teal (#00555A), ΔE 0.029 away. White text reads best on it, at 8.25:1.
| Hue family | Teals and cyans |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Deep Teal (#00555A) |
| Black text | 2.54:1 |
| White text | 8.25:1 |
Values
| HEX | #00566B |
| RGB | rgb(0, 86, 107) |
| HSL | hsl(192, 100%, 21%) |
| OKLCH | oklch(42% 0.077 221.7) |
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 #00566B | 8.25:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #00566B | 2.54:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #00566B text on white | 8.25:1 | AAA | Lc 88.0 | Fine for body text |
| #00566B text on black | 2.54:1 | Fails | Lc -14.1 | 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
#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
#A1C8D6
oklch(80.9% 0.046 221.7)
-
Step 400
400
#6CABC1
oklch(70.7% 0.072 222.2)
-
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
#006C85
oklch(49.2% 0.09 221.2)
-
Step 800
800 (this color)
#00566B
oklch(42% 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)
#00566B 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 | 0.063 |
| Deuteranopia (no green cones) | #3D4B6B | 0.054 |
| Tritanopia (no blue cones) | #005D5D | 0.038 |
| Achromatopsia (no color) | #4E4E4E | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00566B
#00566B
oklch(42% 0.077 221.7)
- #703E2A
#703E2A
oklch(42.1% 0.077 42.2)
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 #00566B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Teal #00555A ΔE 0.029
- Petrol #005F6A ΔE 0.030
- Deep Sea Blue #015482 ΔE 0.041
- Dark Slate Gray #2F4F4F ΔE 0.050
- Dark Teal #014D4E ΔE 0.051
- Light Navy #155084 ΔE 0.051
- Dark Grey Blue #29465B ΔE 0.052
- Charcoal #264653 ΔE 0.056
Use #00566B 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.