#218666
Closest named color: Sea Green (#2E8B57). oklch(55.5% 0.103 166.9), rgb(33, 134, 102).
Aa
Black text reads best on this color (4.66:1).
About this color
#218666 is a medium-dark, moderately saturated green. In OKLCH its lightness is 56%, its chroma 0.103 and its hue 167°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Sea Green (#2E8B57), ΔE 0.031 away. Black text reads best on it, at 4.66:1.
| Hue family | Greens |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.103) |
| Temperature | in between |
| Nearest name | Sea Green (#2E8B57) |
| Black text | 4.66:1 |
| White text | 4.50:1 |
Values
| HEX | #218666 |
| RGB | rgb(33, 134, 102) |
| HSL | hsl(161, 60%, 33%) |
| OKLCH | oklch(55.5% 0.103 166.9) |
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 #218666 | 4.50:1 | AA | Lc -76.3 | Fine for body text |
| Black text on #218666 | 4.66:1 | AA | Lc 33.2 | Non-text elements, placeholder text |
| #218666 text on white | 4.50:1 | AA | Lc 70.9 | Content text, not long reading |
| #218666 text on black | 4.66:1 | AA | Lc -30.8 | 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
#F2F7F4
oklch(97.2% 0.007 160.1)
-
Step 100
100
#E2EDE8
oklch(93.6% 0.013 167.2)
-
Step 200
200
#CADFD5
oklch(88.5% 0.026 165.6)
-
Step 300
300
#A5CBBA
oklch(81% 0.047 166.2)
-
Step 400
400
#72B097
oklch(70.8% 0.074 166.9)
-
Step 500
500
#489C7D
oklch(63.2% 0.095 166.6)
-
Step 600
600 (this color)
#218666
oklch(55.5% 0.103 166.9)
-
Step 700
700
#107255
oklch(49.2% 0.096 166.8)
-
Step 800
800
#145D46
oklch(42.8% 0.08 167)
-
Step 900
900
#1A4C3A
oklch(37.7% 0.062 166.2)
-
Step 950
950
#112D22
oklch(27.1% 0.04 165.5)
#218666 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) | #837C64 | 0.104 |
| Deuteranopia (no green cones) | #767368 | 0.100 |
| Tritanopia (no blue cones) | #00867D | 0.035 |
| Achromatopsia (no color) | #777777 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #218666
#218666
oklch(55.5% 0.103 166.9)
- #9E597F
#9E597F
oklch(55.6% 0.103 346.8)
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 #218666, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sea Green #2E8B57 ΔE 0.031
- Viridian #1E9167 ΔE 0.034
- Dark Sage #598556 ΔE 0.046
- Teal #008080 ΔE 0.050
- Jungle Green #048243 ΔE 0.050
- Dark Cyan #008B8B ΔE 0.053
- Bluegreen #017A79 ΔE 0.056
- Light Forest Green #4F9153 ΔE 0.059
Use #218666 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.