#166C51
Closest named color: Dark Green Blue (#1F6357). oklch(47.5% 0.09 166.6), rgb(22, 108, 81).
Aa
White text reads best on this color (6.36:1).
About this color
#166C51 is a medium-dark, moderately saturated green. In OKLCH its lightness is 47%, its chroma 0.090 and its hue 167°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.034 away. White text reads best on it, at 6.36:1.
| Hue family | Greens |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.090) |
| Temperature | in between |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 3.29:1 |
| White text | 6.36:1 |
Values
| HEX | #166C51 |
| RGB | rgb(22, 108, 81) |
| HSL | hsl(161, 66%, 25%) |
| OKLCH | oklch(47.5% 0.09 166.6) |
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 #166C51 | 6.36:1 | AA | Lc -86.4 | Fine for body text |
| Black text on #166C51 | 3.29:1 | AA large text | Lc 22.8 | Dividers and decoration only |
| #166C51 text on white | 6.36:1 | AA | Lc 81.3 | Fine for body text |
| #166C51 text on black | 3.29:1 | AA large text | Lc -20.6 | 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
#F2F7F4
oklch(97.2% 0.007 160.1)
-
Step 100
100
#E2EDE8
oklch(93.6% 0.013 167.2)
-
Step 200
200
#CBDFD6
oklch(88.6% 0.025 167)
-
Step 300
300
#A7CABA
oklch(80.9% 0.044 165.9)
-
Step 400
400
#75AF97
oklch(70.7% 0.07 166.6)
-
Step 500
500
#4E9B7E
oklch(63.2% 0.089 166.7)
-
Step 600
600
#2C8567
oklch(55.6% 0.097 166.9)
-
Step 700
700 (this color)
#166C51
oklch(47.5% 0.09 166.6)
-
Step 800
800
#1B5C46
oklch(42.7% 0.075 166.6)
-
Step 900
900
#1E4B3B
oklch(37.6% 0.057 167.3)
-
Step 950
950
#132C22
oklch(26.9% 0.037 165.7)
#166C51 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) | #696450 | 0.089 |
| Deuteranopia (no green cones) | #5F5C53 | 0.087 |
| Tritanopia (no blue cones) | #006C64 | 0.030 |
| Achromatopsia (no color) | #5F5F5F | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166C51
#166C51
oklch(47.5% 0.09 166.6)
- #804666
#804666
oklch(47.5% 0.09 346.8)
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 #166C51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.034
- Dark Aqua #05696B ΔE 0.046
- Dark Aquamarine #017371 ΔE 0.048
- Spruce #0A5F38 ΔE 0.050
- Pine #2B5D34 ΔE 0.052
- Deep Turquoise #017374 ΔE 0.053
- Bluegreen #017A79 ΔE 0.065
- Dark Olive Green #556B2F ΔE 0.065
Use #166C51 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.