#066355
Closest named color: Dark Green Blue (#1F6357). oklch(44.8% 0.08 178.4), rgb(6, 99, 85).
Aa
White text reads best on this color (7.18:1).
About this color
#066355 is a dark, moderately saturated teal or cyan. In OKLCH its lightness is 45%, its chroma 0.080 and its hue 178°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.012 away. White text reads best on it, at 7.18:1.
| Hue family | Teals and cyans |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 2.92:1 |
| White text | 7.18:1 |
Values
| HEX | #066355 |
| RGB | rgb(6, 99, 85) |
| HSL | hsl(171, 89%, 21%) |
| OKLCH | oklch(44.8% 0.08 178.4) |
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 #066355 | 7.18:1 | AAA | Lc -89.4 | Fine for body text |
| Black text on #066355 | 2.92:1 | Fails | Lc 19.6 | Dividers and decoration only |
| #066355 text on white | 7.18:1 | AAA | Lc 84.5 | Fine for body text |
| #066355 text on black | 2.92:1 | Fails | Lc -17.5 | 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
#F1F7F5
oklch(97.1% 0.007 174.4)
-
Step 100
100
#E1EDEA
oklch(93.6% 0.013 179.5)
-
Step 200
200
#C8DFD9
oklch(88.5% 0.026 178.3)
-
Step 300
300
#A1CBC1
oklch(80.9% 0.047 178.9)
-
Step 400
400
#6AB0A1
oklch(70.6% 0.075 178.8)
-
Step 500
500
#399C8A
oklch(63% 0.096 178.8)
-
Step 600
600
#008674
oklch(55.5% 0.101 178.9)
-
Step 700
700
#007161
oklch(49.1% 0.09 178.4)
-
Step 800
800 (this color)
#066355
oklch(44.8% 0.08 178.4)
-
Step 900
900
#0F4C42
oklch(37.6% 0.062 179.1)
-
Step 950
950
#0C2D27
oklch(27.1% 0.04 179.1)
#066355 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) | #5E5C54 | 0.084 |
| Deuteranopia (no green cones) | #535456 | 0.080 |
| Tritanopia (no blue cones) | #00655F | 0.016 |
| Achromatopsia (no color) | #575757 | 0.081 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #066355
#066355
oklch(44.8% 0.08 178.4)
- #784154
#784154
oklch(44.8% 0.08 358.7)
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 #066355, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.012
- Dark Aqua #05696B ΔE 0.036
- Petrol #005F6A ΔE 0.041
- Spruce #0A5F38 ΔE 0.043
- Pine #2B5D34 ΔE 0.047
- Deep Teal #00555A ΔE 0.051
- Dark Blue Green #005249 ΔE 0.056
- Dark Aquamarine #017371 ΔE 0.058
Use #066355 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.