#188E73
Closest named color: Viridian (#1E9167). oklch(57.9% 0.106 172.2), rgb(24, 142, 115).
Aa
Black text reads best on this color (5.15:1).
About this color
#188E73 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.106 and its hue 172°. Its hue sits on the cool side of the wheel. The nearest named color is Viridian (#1E9167), ΔE 0.022 away. Black text reads best on it, at 5.15:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.106) |
| Temperature | cool |
| Nearest name | Viridian (#1E9167) |
| Black text | 5.15:1 |
| White text | 4.07:1 |
Values
| HEX | #188E73 |
| RGB | rgb(24, 142, 115) |
| HSL | hsl(166, 71%, 33%) |
| OKLCH | oklch(57.9% 0.106 172.2) |
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 #188E73 | 4.07:1 | AA large text | Lc -73.0 | Content text, not long reading |
| Black text on #188E73 | 5.15:1 | AA | Lc 36.6 | Non-text elements, placeholder text |
| #188E73 text on white | 4.07:1 | AA large text | Lc 67.5 | Content text, not long reading |
| #188E73 text on black | 5.15:1 | AA | Lc -34.2 | Non-text elements, placeholder text |
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 600.
-
Step 50
50
#F1F7F5
oklch(97.1% 0.007 174.4)
-
Step 100
100
#E1EDE9
oklch(93.6% 0.014 174.2)
-
Step 200
200
#C8DFD7
oklch(88.4% 0.027 172.8)
-
Step 300
300
#A2CBBD
oklch(80.9% 0.048 172.2)
-
Step 400
400
#6CB09B
oklch(70.6% 0.076 172.4)
-
Step 500
500
#3E9D83
oklch(63.2% 0.098 172)
-
Step 600
600 (this color)
#188E73
oklch(57.9% 0.106 172.2)
-
Step 700
700
#00725B
oklch(49.2% 0.095 172.3)
-
Step 800
800
#025D4A
oklch(42.7% 0.082 172.4)
-
Step 900
900
#134C3E
oklch(37.6% 0.063 172.9)
-
Step 950
950
#0E2D24
oklch(27.1% 0.041 171.3)
#188E73 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) | #898472 | 0.110 |
| Deuteranopia (no green cones) | #7B7975 | 0.106 |
| Tritanopia (no blue cones) | #008F86 | 0.028 |
| Achromatopsia (no color) | #7E7E7E | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #188E73
#188E73
oklch(57.9% 0.106 172.2)
- #A95E80
#A95E80
oklch(57.8% 0.106 352.3)
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 #188E73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Viridian #1E9167 ΔE 0.022
- Sea Green #2E8B57 ΔE 0.037
- Dark Cyan #008B8B ΔE 0.041
- Ocean Green #3D9973 ΔE 0.042
- Dusty Teal #4C9085 ΔE 0.046
- Blue Green #0F9B8E ΔE 0.048
- Teal Green #0A9396 ΔE 0.051
- Dark Sage #598556 ΔE 0.053
Use #188E73 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.