#21C399
Closest named color: Green Blue (#01C08D). oklch(72.9% 0.139 169.4), rgb(33, 195, 153).
Aa
Black text reads best on this color (9.33:1).
About this color
#21C399 is a medium-light, moderately saturated green. In OKLCH its lightness is 73%, its chroma 0.139 and its hue 169°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Green Blue (#01C08D), ΔE 0.019 away. Black text reads best on it, at 9.33:1.
| Hue family | Greens |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.139) |
| Temperature | in between |
| Nearest name | Green Blue (#01C08D) |
| Black text | 9.33:1 |
| White text | 2.25:1 |
Values
| HEX | #21C399 |
| RGB | rgb(33, 195, 153) |
| HSL | hsl(164, 71%, 45%) |
| OKLCH | oklch(72.9% 0.139 169.4) |
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 #21C399 | 2.25:1 | Fails | Lc -48.6 | Large or bold text, headings |
| Black text on #21C399 | 9.33:1 | AAA | Lc 60.1 | Content text, not long reading |
| #21C399 text on white | 2.25:1 | Fails | Lc 43.8 | Non-text elements, placeholder text |
| #21C399 text on black | 9.33:1 | AAA | Lc -58.3 | 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
#EEF8F4
oklch(97.1% 0.012 170.3)
-
Step 100
100
#DAF0E7
oklch(93.6% 0.026 169.3)
-
Step 200
200
#BBE4D4
oklch(88.5% 0.048 169.5)
-
Step 300
300
#85D3B7
oklch(80.8% 0.087 169.3)
-
Step 400
400 (this color)
#21C399
oklch(72.9% 0.139 169.4)
-
Step 500
500
#00A17D
oklch(63% 0.125 169.6)
-
Step 600
600
#008868
oklch(55.7% 0.112 168.9)
-
Step 700
700
#007257
oklch(49.1% 0.098 169.1)
-
Step 800
800
#005E47
oklch(42.8% 0.086 168.9)
-
Step 900
900
#004E3B
oklch(37.7% 0.075 169.6)
-
Step 950
950
#002F22
oklch(27.1% 0.054 168.9)
#21C399 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) | #BDB597 | 0.141 |
| Deuteranopia (no green cones) | #AAA79C | 0.136 |
| Tritanopia (no blue cones) | #00C4B7 | 0.042 |
| Achromatopsia (no color) | #ADADAD | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21C399
#21C399
oklch(72.9% 0.139 169.4)
- #E781B5
#E781B5
oklch(73% 0.139 349.2)
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 #21C399, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Green Blue #01C08D ΔE 0.019
- Greenblue #23C48B ΔE 0.021
- Greeny Blue #42B395 ΔE 0.045
- Topaz #13BBAF ΔE 0.045
- Dark Mint #48C072 ΔE 0.049
- Dark Mint Green #20C073 ΔE 0.050
- Dark Seafoam #1FB57A ΔE 0.050
- Emerald #06D6A0 ΔE 0.053
Use #21C399 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.