#218C78
Closest named color: Dark Cyan (#008B8B). oklch(57.7% 0.098 176.8), rgb(33, 140, 120).
Aa
Black text reads best on this color (5.08:1).
About this color
#218C78 is a medium-dark, moderately saturated teal or cyan. In OKLCH its lightness is 58%, its chroma 0.098 and its hue 177°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Cyan (#008B8B), ΔE 0.031 away. Black text reads best on it, at 5.08:1.
| Hue family | Teals and cyans |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Dark Cyan (#008B8B) |
| Black text | 5.08:1 |
| White text | 4.12:1 |
Values
| HEX | #218C78 |
| RGB | rgb(33, 140, 120) |
| HSL | hsl(169, 62%, 34%) |
| OKLCH | oklch(57.7% 0.098 176.8) |
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 #218C78 | 4.12:1 | AA large text | Lc -73.5 | Content text, not long reading |
| Black text on #218C78 | 5.08:1 | AA | Lc 36.1 | Non-text elements, placeholder text |
| #218C78 text on white | 4.12:1 | AA large text | Lc 68.0 | Content text, not long reading |
| #218C78 text on black | 5.08:1 | AA | Lc -33.7 | 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
#F2F7F5
oklch(97.2% 0.006 170.4)
-
Step 100
100
#E1EDE9
oklch(93.6% 0.014 174.2)
-
Step 200
200
#C9DFD9
oklch(88.6% 0.025 177.6)
-
Step 300
300
#A3CAC0
oklch(80.8% 0.044 177.8)
-
Step 400
400
#6FAFA0
oklch(70.6% 0.07 177.7)
-
Step 500
500
#429B88
oklch(63% 0.09 177)
-
Step 600
600 (this color)
#218C78
oklch(57.7% 0.098 176.8)
-
Step 700
700
#007160
oklch(49.1% 0.091 177.4)
-
Step 800
800
#0B5C4E
oklch(42.6% 0.075 177.1)
-
Step 900
900
#164C41
oklch(37.8% 0.059 176.8)
-
Step 950
950
#0F2C26
oklch(26.9% 0.037 177.8)
#218C78 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) | #868377 | 0.102 |
| Deuteranopia (no green cones) | #78797A | 0.098 |
| Tritanopia (no blue cones) | #008E86 | 0.020 |
| Achromatopsia (no color) | #7D7D7D | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #218C78
#218C78
oklch(57.7% 0.098 176.8)
- #A7607A
#A7607A
oklch(57.7% 0.097 357.2)
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 #218C78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Cyan #008B8B ΔE 0.031
- Viridian #1E9167 ΔE 0.034
- Dusty Teal #4C9085 ΔE 0.040
- Teal Green #0A9396 ΔE 0.044
- Teal #008080 ΔE 0.045
- Sea Green #2E8B57 ΔE 0.047
- Blue Green #0F9B8E ΔE 0.047
- Ocean Green #3D9973 ΔE 0.048
Use #218C78 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.