Algae Green #21C36F
Algae Green is a medium-light, vivid green with hex code #21C36F and RGB rgb(33, 195, 111).
Aa
Black text reads best on this color (9.10:1).
About this color
#21C36F is a medium-light, vivid green. In OKLCH its lightness is 72%, its chroma 0.175 and its hue 154°. Its hue sits between the warm and cool halves of the wheel. It is the named color Algae Green. Black text reads best on it, at 9.10:1.
| Hue family | Greens |
| Lightness | medium-light (72%) |
| Chroma | vivid (0.175) |
| Temperature | in between |
| Nearest name | Algae Green |
| Black text | 9.10:1 |
| White text | 2.30:1 |
Colors that go with Algae Green
Matches found by rotating Algae Green 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 Algae Green
Curated color palettes that contain a color within ΔE 0.06 (OKLab) of Algae Green, closest first.
Similar named colors
The eight named colors closest to Algae Green, with their ΔE distance.
- Dark Mint Green #20C073 ΔE 0.011
- Dark Mint #48C072 ΔE 0.020
- Cool Green #33B864 ΔE 0.030
- Greenblue #23C48B ΔE 0.036
- Shamrock Green #02C14D ΔE 0.038
- Seaweed #18D17B ΔE 0.039
- Green Blue #01C08D ΔE 0.042
- Green Teal #0CB577 ΔE 0.046
More about Algae Green
How to make Algae Green
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.
- 4 parts green
- 3 parts white
- 1 part yellow
Recipe result: #63BC68, a difference of ΔE 0.037 from Algae Green. That is close; add a little more of one paint to match.
Codes for Algae Green in every format
| HEX | #21C36F |
| RGB | rgb(33, 195, 111) |
| HSL | hsl(149, 71%, 45%) |
| OKLCH | oklch(72% 0.175 153.7) |
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 #21C36F | 2.30:1 | Fails | Lc -49.8 | Large or bold text, headings |
| Black text on #21C36F | 9.10:1 | AAA | Lc 59.0 | Large or bold text, headings |
| #21C36F text on white | 2.30:1 | Fails | Lc 44.9 | Non-text elements, placeholder text |
| #21C36F text on black | 9.10:1 | AAA | Lc -57.2 | Large or bold text, headings |
Shades and tints of Algae Green
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
#DBF0E0
oklch(93.5% 0.031 152.9)
-
Step 200
200
#BBE5C7
oklch(88.4% 0.06 154)
-
Step 300
300
#86D5A0
oklch(80.8% 0.109 153.9)
-
Step 400
400 (this color)
#21C36F
oklch(72% 0.175 153.7)
-
Step 500
500
#00A45A
oklch(63.1% 0.159 153.9)
-
Step 600
600
#008A4A
oklch(55.6% 0.141 153.6)
-
Step 700
700
#00743E
oklch(49% 0.124 153.9)
-
Step 800
800
#005F32
oklch(42.6% 0.107 154.1)
-
Step 900
900
#005028
oklch(37.8% 0.097 153.4)
-
Step 950
950
#003016
oklch(27.1% 0.069 153.7)
Algae Green 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) | #C3B269 | 0.153 |
| Deuteranopia (no green cones) | #B1A675 | 0.149 |
| Tritanopia (no blue cones) | #00C1AE | 0.088 |
| Achromatopsia (no color) | #ABABAB | 0.176 |
Use Algae Green 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.