#166B57
Closest named color: Dark Green Blue (#1F6357). oklch(47.4% 0.084 172.6), rgb(22, 107, 87).
Aa
White text reads best on this color (6.41:1).
About this color
#166B57 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 47%, its chroma 0.084 and its hue 173°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Green Blue (#1F6357), ΔE 0.026 away. White text reads best on it, at 6.41:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Dark Green Blue (#1F6357) |
| Black text | 3.27:1 |
| White text | 6.41:1 |
Values
| HEX | #166B57 |
| RGB | rgb(22, 107, 87) |
| HSL | hsl(166, 66%, 25%) |
| OKLCH | oklch(47.4% 0.084 172.6) |
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 #166B57 | 6.41:1 | AA | Lc -86.6 | Fine for body text |
| Black text on #166B57 | 3.27:1 | AA large text | Lc 22.6 | Dividers and decoration only |
| #166B57 text on white | 6.41:1 | AA | Lc 81.5 | Fine for body text |
| #166B57 text on black | 3.27:1 | AA large text | Lc -20.4 | 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
#A7CABE
oklch(81% 0.041 172.4)
-
Step 400
400
#76AE9C
oklch(70.7% 0.065 172.3)
-
Step 500
500
#4E9A84
oklch(63.1% 0.083 172.4)
-
Step 600
600
#2C846E
oklch(55.5% 0.09 173.1)
-
Step 700
700 (this color)
#166B57
oklch(47.4% 0.084 172.6)
-
Step 800
800
#1C5B4B
oklch(42.6% 0.069 172.8)
-
Step 900
900
#1E4B3F
oklch(37.7% 0.054 173.3)
-
Step 950
950
#132C25
oklch(27% 0.034 173.4)
#166B57 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) | #676356 | 0.087 |
| Deuteranopia (no green cones) | #5C5B58 | 0.084 |
| Tritanopia (no blue cones) | #006C65 | 0.021 |
| Achromatopsia (no color) | #5F5F5F | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #166B57
#166B57
oklch(47.4% 0.084 172.6)
- #804760
#804760
oklch(47.4% 0.084 353)
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 #166B57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Green Blue #1F6357 ΔE 0.026
- Dark Aqua #05696B ΔE 0.035
- Dark Aquamarine #017371 ΔE 0.041
- Deep Turquoise #017374 ΔE 0.045
- Spruce #0A5F38 ΔE 0.054
- Pine #2B5D34 ΔE 0.056
- Petrol #005F6A ΔE 0.058
- Bluegreen #017A79 ΔE 0.060
Use #166B57 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.