#166C5D
Closest named color: Dark Green Blue (#1F6357). oklch(47.9% 0.081 177.8), rgb(22, 108, 93).
Aa
White text reads best on this color (6.29:1).
About this color
#166C5D is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 48%, its chroma 0.081 and its hue 178°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.027 away. White text reads best on it, at 6.29:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.081) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 3.33:1 |
| White text | 6.29:1 |
Values
| HEX | #166C5D |
| RGB | rgb(22, 108, 93) |
| HSL | hsl(170, 66%, 25%) |
| OKLCH | oklch(47.9% 0.081 177.8) |
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 #166C5D | 6.29:1 | AA | Lc -86.1 | Fine for body text |
| Black text on #166C5D | 3.33:1 | AA large text | Lc 23.1 | Dividers and decoration only |
| #166C5D text on white | 6.29:1 | AA | Lc 81.0 | Fine for body text |
| #166C5D text on black | 3.33:1 | AA large text | Lc -20.9 | 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
#F2F7F5
oklch(97.2% 0.006 170.4)
-
Step 100
100
#E2ECEA
oklch(93.5% 0.011 182.9)
-
Step 200
200
#CBDED9
oklch(88.5% 0.021 178.3)
-
Step 300
300
#A6C9C0
oklch(80.8% 0.039 177.9)
-
Step 400
400
#75AEA0
oklch(70.7% 0.063 177.3)
-
Step 500
500
#4D9A89
oklch(63.2% 0.081 177.3)
-
Step 600
600
#2B8473
oklch(55.6% 0.087 177.7)
-
Step 700
700 (this color)
#166C5D
oklch(47.9% 0.081 177.8)
-
Step 800
800
#1A5B4F
oklch(42.7% 0.068 178.1)
-
Step 900
900
#1D4B41
oklch(37.8% 0.053 176.8)
-
Step 950
950
#132C26
oklch(27.1% 0.033 176.2)
#166C5D 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) | #67655C | 0.085 |
| Deuteranopia (no green cones) | #5C5D5E | 0.081 |
| Tritanopia (no blue cones) | #006E67 | 0.015 |
| Achromatopsia (no color) | #606060 | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166C5D
#166C5D
oklch(47.9% 0.081 177.8)
- #82495D
#82495D
oklch(47.9% 0.081 358.2)
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 #166C5D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.027
- Dark Aqua #05696B ΔE 0.028
- Dark Aquamarine #017371 ΔE 0.032
- Deep Turquoise #017374 ΔE 0.036
- Bluegreen #017A79 ΔE 0.052
- Petrol #005F6A ΔE 0.054
- Deep Aqua #08787F ΔE 0.056
- Spruce #0A5F38 ΔE 0.062
Use #166C5D 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.