Seaweed #18D17B
Seaweed is a medium-light, vivid green with hex code #18D17B and RGB rgb(24, 209, 123).
Aa
Black text reads best on this color (10.44:1).
About this color
#18D17B is a medium-light, vivid green. In OKLCH its lightness is 76%, its chroma 0.183 and its hue 155°. Its hue sits between the warm and cool halves of the wheel. It is the named color Seaweed. Black text reads best on it, at 10.44:1.
| Hue family | Greens |
| Lightness | medium-light (76%) |
| Chroma | vivid (0.183) |
| Temperature | in between |
| Nearest name | Seaweed |
| Black text | 10.44:1 |
| White text | 2.01:1 |
Colors that go with Seaweed
Matches found by rotating Seaweed around the OKLCH hue wheel, each labelled with the closest name in our list.
Complementary
The opposite hue (180°).
Analogous
Neighbouring hues, 30° either side.
Triadic
Three hues spaced 120° apart.
Color palettes with Seaweed
Curated color palettes that contain a color within ΔE 0.06 (OKLab) of Seaweed, closest first.
Similar named colors
The eight named colors closest to Seaweed, with their ΔE distance.
- Algae Green #21C36F ΔE 0.039
- Emerald #06D6A0 ΔE 0.046
- Dark Mint #48C072 ΔE 0.046
- Aqua Green #12E193 ΔE 0.047
- Dark Mint Green #20C073 ΔE 0.047
- Greenblue #23C48B ΔE 0.048
- Soft Green #6FC276 ΔE 0.056
- Weird Green #3AE57F ΔE 0.059
More about Seaweed
How to make Seaweed
A starting recipe from common paint colors, found with a spectral paint model (the color mixer’s paint mode). Real pigments vary, so mix a small test batch and adjust.
- 1 part green
- 1 part white
Recipe result: #74C780, a difference of ΔE 0.056 from Seaweed. That is close; add a little more of one paint to match.
Codes for Seaweed in every format
| HEX | #18D17B |
| RGB | rgb(24, 209, 123) |
| HSL | hsl(152, 79%, 46%) |
| OKLCH | oklch(75.8% 0.183 155.1) |
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 #18D17B | 2.01:1 | Fails | Lc -42.8 | Non-text elements, placeholder text |
| Black text on #18D17B | 10.44:1 | AAA | Lc 65.6 | Content text, not long reading |
| #18D17B text on white | 2.01:1 | Fails | Lc 38.4 | Non-text elements, placeholder text |
| #18D17B text on black | 10.44:1 | AAA | Lc -64.0 | Content text, not long reading |
Shades and tints of Seaweed
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 400.
-
Step 50
50
#EEF9F1
oklch(97.2% 0.016 154.5)
-
Step 100
100
#D9F1E0
oklch(93.6% 0.034 154.8)
-
Step 200
200
#B9E6C7
oklch(88.5% 0.063 154.9)
-
Step 300
300
#81D7A0
oklch(81% 0.115 154.9)
-
Step 400
400 (this color)
#18D17B
oklch(75.8% 0.183 155.1)
-
Step 500
500
#00A45E
oklch(63.1% 0.156 155.1)
-
Step 600
600
#008A4E
oklch(55.6% 0.137 155)
-
Step 700
700
#007441
oklch(49.1% 0.121 155.2)
-
Step 800
800
#005F34
oklch(42.6% 0.105 155.1)
-
Step 900
900
#004F2B
oklch(37.6% 0.092 155.5)
-
Step 950
950
#003017
oklch(27.1% 0.068 154.6)
Seaweed 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) | #D0BF75 | 0.162 |
| Deuteranopia (no green cones) | #BDB181 | 0.160 |
| Tritanopia (no blue cones) | #00CFBC | 0.090 |
| Achromatopsia (no color) | #B7B7B7 | 0.184 |
Use Seaweed 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.