#005A66
Closest named color: Petrol (#005F6A). oklch(42.9% 0.074 210.4), rgb(0, 90, 102).
Aa
White text reads best on this color (7.91:1).
About this color
#005A66 is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 43%, its chroma 0.074 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Petrol (#005F6A), ΔE 0.016 away. White text reads best on it, at 7.91:1.
| Hue family | Teals and cyans |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Petrol (#005F6A) |
| Black text | 2.65:1 |
| White text | 7.91:1 |
Values
| HEX | #005A66 |
| RGB | rgb(0, 90, 102) |
| HSL | hsl(187, 100%, 20%) |
| OKLCH | oklch(42.9% 0.074 210.4) |
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 #005A66 | 7.91:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #005A66 | 2.65:1 | Fails | Lc 17.1 | Dividers and decoration only |
| #005A66 text on white | 7.91:1 | AAA | Lc 86.9 | Fine for body text |
| #005A66 text on black | 2.65:1 | Fails | Lc -15.2 | 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 800.
-
Step 50
50
#F1F7F8
oklch(97.2% 0.007 208.8)
-
Step 100
100
#E1ECEE
oklch(93.5% 0.012 209.8)
-
Step 200
200
#C8DEE2
oklch(88.5% 0.024 209.8)
-
Step 300
300
#A1C9D0
oklch(80.9% 0.043 209.4)
-
Step 400
400
#6BADB9
oklch(70.8% 0.069 210.3)
-
Step 500
500
#3B98A7
oklch(63.1% 0.089 209.9)
-
Step 600
600
#008293
oklch(55.6% 0.096 210.7)
-
Step 700
700
#006D7C
oklch(49% 0.085 211.2)
-
Step 800
800 (this color)
#005A66
oklch(42.9% 0.074 210.4)
-
Step 900
900
#114A53
oklch(37.8% 0.058 210.4)
-
Step 950
950
#0D2B30
oklch(26.9% 0.036 210.1)
#005A66 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) | #505667 | 0.070 |
| Deuteranopia (no green cones) | #444D66 | 0.064 |
| Tritanopia (no blue cones) | #005F5E | 0.024 |
| Achromatopsia (no color) | #515151 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #005A66
#005A66
oklch(42.9% 0.074 210.4)
- #733F36
#733F36
oklch(42.9% 0.075 30.8)
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 #005A66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Petrol #005F6A ΔE 0.016
- Deep Teal #00555A ΔE 0.023
- Dark Slate Gray #2F4F4F ΔE 0.047
- Dark Green Blue #1F6357 ΔE 0.047
- Dark Aqua #05696B ΔE 0.048
- Dark Blue Green #005249 ΔE 0.050
- Dark Teal #014D4E ΔE 0.051
- Deep Sea Blue #015482 ΔE 0.056
Use #005A66 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.