#166E59
Closest named color: Dark Green Blue (#1F6357). oklch(48.3% 0.086 172.2), rgb(22, 110, 89).
Aa
White text reads best on this color (6.16:1).
About this color
#166E59 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 48%, its chroma 0.086 and its hue 172°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.035 away. White text reads best on it, at 6.16:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 3.40:1 |
| White text | 6.16:1 |
Values
| HEX | #166E59 |
| RGB | rgb(22, 110, 89) |
| HSL | hsl(166, 67%, 26%) |
| OKLCH | oklch(48.3% 0.086 172.2) |
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 #166E59 | 6.16:1 | AA | Lc -85.5 | Fine for body text |
| Black text on #166E59 | 3.40:1 | AA large text | Lc 23.7 | Dividers and decoration only |
| #166E59 text on white | 6.16:1 | AA | Lc 80.4 | Fine for body text |
| #166E59 text on black | 3.40:1 | AA large text | Lc -21.5 | 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 700.
-
Step 50
50
#F2F7F5
oklch(97.2% 0.006 170.4)
-
Step 100
100
#E2EDE9
oklch(93.7% 0.013 172.4)
-
Step 200
200
#CBDED7
oklch(88.4% 0.022 171.7)
-
Step 300
300
#A6CABE
oklch(80.9% 0.042 173)
-
Step 400
400
#74AF9C
oklch(70.8% 0.068 172.1)
-
Step 500
500
#4C9A84
oklch(63% 0.085 172.8)
-
Step 600
600
#29856D
oklch(55.7% 0.093 171.9)
-
Step 700
700 (this color)
#166E59
oklch(48.3% 0.086 172.2)
-
Step 800
800
#195C4B
oklch(42.8% 0.072 172.3)
-
Step 900
900
#1D4B3E
oklch(37.7% 0.055 172)
-
Step 950
950
#122C24
oklch(27% 0.036 171.2)
#166E59 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) | #6A6658 | 0.089 |
| Deuteranopia (no green cones) | #5F5E5A | 0.085 |
| Tritanopia (no blue cones) | #006F68 | 0.023 |
| Achromatopsia (no color) | #616161 | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166E59
#166E59
oklch(48.3% 0.086 172.2)
- #834963
#834963
oklch(48.3% 0.085 352.4)
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 #166E59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.035
- Dark Aquamarine #017371 ΔE 0.036
- Dark Aqua #05696B ΔE 0.038
- Deep Turquoise #017374 ΔE 0.041
- Bluegreen #017A79 ΔE 0.053
- Deep Aqua #08787F ΔE 0.059
- Spruce #0A5F38 ΔE 0.061
- Pine #2B5D34 ΔE 0.063
Use #166E59 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.