#21C374
Closest named color: Algae Green (#21C36F). oklch(72.1% 0.17 155.1), rgb(33, 195, 116).
Aa
Black text reads best on this color (9.12:1).
About this color
#21C374 is a medium-light, vivid green. In OKLCH its lightness is 72%, its chroma 0.170 and its hue 155°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Algae Green (#21C36F), ΔE 0.006 away. Black text reads best on it, at 9.12:1.
| Hue family | Greens |
| Lightness | medium-light (72%) |
| Chroma | vivid (0.170) |
| Temperature | in between |
| Nearest name | Algae Green (#21C36F) |
| Black text | 9.12:1 |
| White text | 2.30:1 |
Values
| HEX | #21C374 |
| RGB | rgb(33, 195, 116) |
| HSL | hsl(151, 71%, 45%) |
| OKLCH | oklch(72.1% 0.17 155.1) |
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 #21C374 | 2.30:1 | Fails | Lc -49.7 | Large or bold text, headings |
| Black text on #21C374 | 9.12:1 | AAA | Lc 59.1 | Large or bold text, headings |
| #21C374 text on white | 2.30:1 | Fails | Lc 44.8 | Non-text elements, placeholder text |
| #21C374 text on black | 9.12:1 | AAA | Lc -57.3 | Large or bold text, headings |
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 400.
-
Step 50
50
#EEF8F1
oklch(97% 0.014 155.6)
-
Step 100
100
#DBF0E1
oklch(93.6% 0.03 154.7)
-
Step 200
200
#BBE5C8
oklch(88.4% 0.059 154.9)
-
Step 300
300
#86D5A3
oklch(80.8% 0.106 155.4)
-
Step 400
400 (this color)
#21C374
oklch(72.1% 0.17 155.1)
-
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)
#21C374 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) | #C2B36E | 0.150 |
| Deuteranopia (no green cones) | #B0A679 | 0.147 |
| Tritanopia (no blue cones) | #00C1AF | 0.083 |
| Achromatopsia (no color) | #ABABAB | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21C374
#21C374
oklch(72.1% 0.17 155.1)
- #E477CE
#E477CE
oklch(72.1% 0.17 335.3)
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 #21C374, closest first.
No curated palette has a color within ΔE 0.04 of #21C374.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Algae Green #21C36F ΔE 0.006
- Dark Mint Green #20C073 ΔE 0.009
- Dark Mint #48C072 ΔE 0.017
- Greenblue #23C48B ΔE 0.030
- Cool Green #33B864 ΔE 0.031
- Green Blue #01C08D ΔE 0.036
- Seaweed #18D17B ΔE 0.039
- Green Teal #0CB577 ΔE 0.044
Use #21C374 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.