#00666D
Closest named color: Dark Aqua (#05696B). oklch(46.5% 0.079 203.1), rgb(0, 102, 109).
Aa
White text reads best on this color (6.72:1).
About this color
#00666D is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 46%, its chroma 0.079 and its hue 203°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Aqua (#05696B), ΔE 0.011 away. White text reads best on it, at 6.72:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Dark Aqua (#05696B) |
| Black text | 3.12:1 |
| White text | 6.72:1 |
Values
| HEX | #00666D |
| RGB | rgb(0, 102, 109) |
| HSL | hsl(184, 100%, 21%) |
| OKLCH | oklch(46.5% 0.079 203.1) |
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 #00666D | 6.72:1 | AA | Lc -87.7 | Fine for body text |
| Black text on #00666D | 3.12:1 | AA large text | Lc 21.4 | Dividers and decoration only |
| #00666D text on white | 6.72:1 | AA | Lc 82.6 | Fine for body text |
| #00666D text on black | 3.12:1 | AA large text | Lc -19.3 | Dividers and decoration only |
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 700.
-
Step 50
50
#F2F6F7
oklch(97% 0.004 214.3)
-
Step 100
100
#E2ECED
oklch(93.6% 0.011 204.1)
-
Step 200
200
#CADEDF
oklch(88.6% 0.021 200.4)
-
Step 300
300
#A5C8CC
oklch(80.9% 0.038 205)
-
Step 400
400
#72ACB2
oklch(70.7% 0.061 204.1)
-
Step 500
500
#48979E
oklch(63% 0.078 203.1)
-
Step 600
600
#228289
oklch(55.7% 0.085 202.3)
-
Step 700
700 (this color)
#00666D
oklch(46.5% 0.079 203.1)
-
Step 800
800
#14595F
oklch(42.6% 0.066 203.7)
-
Step 900
900
#1A4A4E
oklch(37.9% 0.051 202.8)
-
Step 950
950
#112B2D
oklch(27% 0.032 202.1)
#00666D 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) | #5D616E | 0.080 |
| Deuteranopia (no green cones) | #50586D | 0.072 |
| Tritanopia (no blue cones) | #006B68 | 0.020 |
| Achromatopsia (no color) | #5C5C5C | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00666D
#00666D
oklch(46.5% 0.079 203.1)
- #804744
#804744
oklch(46.6% 0.079 23.7)
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 #00666D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Aqua #05696B ΔE 0.011
- Petrol #005F6A ΔE 0.022
- Dark Green Blue #1F6357 ΔE 0.034
- Deep Turquoise #017374 ΔE 0.040
- Dark Aquamarine #017371 ΔE 0.041
- Deep Teal #00555A ΔE 0.057
- Deep Aqua #08787F ΔE 0.058
- YInMn Blue #415A77 ΔE 0.061
Use #00666D 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.