#218D81
Closest named color: Dark Cyan (#008B8B). oklch(58.2% 0.095 183.8), rgb(33, 141, 129).
Aa
Black text reads best on this color (5.19:1).
About this color
#218D81 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.095 and its hue 184°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.020 away. Black text reads best on it, at 5.19:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.19:1 |
| White text | 4.04:1 |
Values
| HEX | #218D81 |
| RGB | rgb(33, 141, 129) |
| HSL | hsl(173, 62%, 34%) |
| OKLCH | oklch(58.2% 0.095 183.8) |
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 #218D81 | 4.04:1 | AA large text | Lc -72.8 | Content text, not long reading |
| Black text on #218D81 | 5.19:1 | AA | Lc 36.8 | Non-text elements, placeholder text |
| #218D81 text on white | 4.04:1 | AA large text | Lc 67.3 | Content text, not long reading |
| #218D81 text on black | 5.19:1 | AA | Lc -34.4 | 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
#F1F7F6
oklch(97.1% 0.006 185.3)
-
Step 100
100
#E1EDEB
oklch(93.7% 0.013 185.1)
-
Step 200
200
#C9DFDB
oklch(88.6% 0.024 183.7)
-
Step 300
300
#A3CAC3
oklch(80.9% 0.043 183.1)
-
Step 400
400
#6EAFA5
oklch(70.7% 0.068 183.5)
-
Step 500
500
#419B8F
oklch(63.2% 0.088 183.4)
-
Step 600
600 (this color)
#218D81
oklch(58.2% 0.095 183.8)
-
Step 700
700
#007066
oklch(49% 0.087 184.2)
-
Step 800
800
#095C53
oklch(42.8% 0.073 183.2)
-
Step 900
900
#154B45
oklch(37.6% 0.057 184.7)
-
Step 950
950
#0F2C28
oklch(27% 0.036 183.4)
#218D81 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) | #868581 | 0.101 |
| Deuteranopia (no green cones) | #777A82 | 0.095 |
| Tritanopia (no blue cones) | #009089 | 0.013 |
| Achromatopsia (no color) | #7E7E7E | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #218D81
#218D81
oklch(58.2% 0.095 183.8)
- #AA6275
#AA6275
oklch(58.3% 0.096 3.5)
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 #218D81, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.020
- Teal Green #0A9396 ΔE 0.031
- Dusty Teal #4C9085 ΔE 0.033
- Blue Green #0F9B8E ΔE 0.041
- Teal #008080 ΔE 0.043
- Viridian #1E9167 ΔE 0.045
- Sea #3C9992 ΔE 0.045
- Persian Green #2A9D8F ΔE 0.049
Use #218D81 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.