#21CB7C
Closest named color: Seaweed (#18D17B). oklch(74.3% 0.173 156.1), rgb(33, 203, 124).
Aa
Black text reads best on this color (9.89:1).
About this color
#21CB7C is a medium-light, vivid green. In OKLCH its lightness is 74%, its chroma 0.173 and its hue 156°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Seaweed (#18D17B), ΔE 0.018 away. Black text reads best on it, at 9.89:1.
| Hue family | Greens |
| Lightness | medium-light (74%) |
| Chroma | vivid (0.173) |
| Temperature | in between |
| Nearest name | Seaweed (#18D17B) |
| Black text | 9.89:1 |
| White text | 2.12:1 |
Values
| HEX | #21CB7C |
| RGB | rgb(33, 203, 124) |
| HSL | hsl(152, 72%, 46%) |
| OKLCH | oklch(74.3% 0.173 156.1) |
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 #21CB7C | 2.12:1 | Fails | Lc -45.6 | Large or bold text, headings |
| Black text on #21CB7C | 9.89:1 | AAA | Lc 62.9 | Content text, not long reading |
| #21CB7C text on white | 2.12:1 | Fails | Lc 41.0 | Non-text elements, placeholder text |
| #21CB7C text on black | 9.89:1 | AAA | Lc -61.3 | Content text, not long reading |
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
#EEF9F1
oklch(97.2% 0.016 154.5)
-
Step 100
100
#DAF1E1
oklch(93.7% 0.032 155.4)
-
Step 200
200
#BAE6C9
oklch(88.6% 0.061 156.1)
-
Step 300
300
#84D6A3
oklch(81% 0.109 155.8)
-
Step 400
400 (this color)
#21CB7C
oklch(74.3% 0.173 156.1)
-
Step 500
500
#00A461
oklch(63.2% 0.153 156.1)
-
Step 600
600
#008A50
oklch(55.7% 0.136 155.8)
-
Step 700
700
#007443
oklch(49.1% 0.119 156.1)
-
Step 800
800
#005F36
oklch(42.7% 0.103 156.1)
-
Step 900
900
#004F2C
oklch(37.6% 0.091 156.1)
-
Step 950
950
#002F18
oklch(26.8% 0.065 156.1)
#21CB7C 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) | #CABA77 | 0.156 |
| Deuteranopia (no green cones) | #B7AD81 | 0.151 |
| Tritanopia (no blue cones) | #00C9B7 | 0.083 |
| Achromatopsia (no color) | #B2B2B2 | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21CB7C
#21CB7C
oklch(74.3% 0.173 156.1)
- #EE7DD5
#EE7DD5
oklch(74.4% 0.173 336.1)
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 #21CB7C, closest first.
No curated palette has a color within ΔE 0.04 of #21CB7C.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Seaweed #18D17B ΔE 0.018
- Algae Green #21C36F ΔE 0.024
- Dark Mint #48C072 ΔE 0.031
- Dark Mint Green #20C073 ΔE 0.031
- Greenblue #23C48B ΔE 0.032
- Green Blue #01C08D ΔE 0.045
- Soft Green #6FC276 ΔE 0.047
- Emerald #06D6A0 ΔE 0.048
Use #21CB7C 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.