#166E51
Closest named color: Dark Green Blue (#1F6357). oklch(48.1% 0.093 165.5), rgb(22, 110, 81).
Aa
White text reads best on this color (6.20:1).
About this color
#166E51 is a medium-dark, moderately saturated green. In OKLCH its lightness is 48%, its chroma 0.093 and its hue 165°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.040 away. White text reads best on it, at 6.20:1.
| Hue family | Greens |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.093) |
| Temperature | in between |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 3.38:1 |
| White text | 6.20:1 |
Values
| HEX | #166E51 |
| RGB | rgb(22, 110, 81) |
| HSL | hsl(160, 67%, 26%) |
| OKLCH | oklch(48.1% 0.093 165.5) |
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 #166E51 | 6.20:1 | AA | Lc -85.7 | Fine for body text |
| Black text on #166E51 | 3.38:1 | AA large text | Lc 23.5 | Dividers and decoration only |
| #166E51 text on white | 6.20:1 | AA | Lc 80.6 | Fine for body text |
| #166E51 text on black | 3.38:1 | AA large text | Lc -21.3 | 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
#F2F7F4
oklch(97.2% 0.007 160.1)
-
Step 100
100
#E2EDE8
oklch(93.6% 0.013 167.2)
-
Step 200
200
#CBDFD5
oklch(88.6% 0.025 164.4)
-
Step 300
300
#A6CABA
oklch(80.8% 0.044 166.5)
-
Step 400
400
#75AF96
oklch(70.7% 0.071 165.6)
-
Step 500
500
#4D9B7C
oklch(63.1% 0.091 165.4)
-
Step 600
600
#2A8665
oklch(55.7% 0.1 165.2)
-
Step 700
700 (this color)
#166E51
oklch(48.1% 0.093 165.5)
-
Step 800
800
#1A5C45
oklch(42.7% 0.076 165.8)
-
Step 900
900
#1D4C3A
oklch(37.8% 0.06 165.4)
-
Step 950
950
#122C22
oklch(26.9% 0.038 166.4)
#166E51 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) | #6C664F | 0.092 |
| Deuteranopia (no green cones) | #615E53 | 0.089 |
| Tritanopia (no blue cones) | #006E66 | 0.033 |
| Achromatopsia (no color) | #616161 | 0.094 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166E51
#166E51
oklch(48.1% 0.093 165.5)
- #824769
#824769
oklch(48% 0.092 345.5)
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 #166E51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.040
- Dark Aquamarine #017371 ΔE 0.048
- Dark Aqua #05696B ΔE 0.049
- Deep Turquoise #017374 ΔE 0.052
- Spruce #0A5F38 ΔE 0.054
- Pine #2B5D34 ΔE 0.056
- Bluegreen #017A79 ΔE 0.063
- Dark Olive Green #556B2F ΔE 0.063
Use #166E51 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.