#21D197
Closest named color: Emerald (#06D6A0). oklch(76.5% 0.157 163.9), rgb(33, 209, 151).
Aa
Black text reads best on this color (10.63:1).
About this color
#21D197 is a medium-light, vivid green. In OKLCH its lightness is 76%, its chroma 0.157 and its hue 164°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Emerald (#06D6A0), ΔE 0.015 away. Black text reads best on it, at 10.63:1.
| Hue family | Greens |
| Lightness | medium-light (76%) |
| Chroma | vivid (0.157) |
| Temperature | in between |
| Nearest name | Emerald (#06D6A0) |
| Black text | 10.63:1 |
| White text | 1.97:1 |
Values
| HEX | #21D197 |
| RGB | rgb(33, 209, 151) |
| HSL | hsl(160, 73%, 47%) |
| OKLCH | oklch(76.5% 0.157 163.9) |
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 #21D197 | 1.97:1 | Fails | Lc -41.9 | Non-text elements, placeholder text |
| Black text on #21D197 | 10.63:1 | AAA | Lc 66.4 | Content text, not long reading |
| #21D197 text on white | 1.97:1 | Fails | Lc 37.6 | Non-text elements, placeholder text |
| #21D197 text on black | 10.63:1 | AAA | Lc -64.9 | 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 300.
-
Step 50
50
#E9FAF2
oklch(97% 0.021 166.1)
-
Step 100
100
#CFF4E2
oklch(93.6% 0.045 164.5)
-
Step 200
200
#A2ECCA
oklch(88.5% 0.088 164.2)
-
Step 300
300 (this color)
#21D197
oklch(76.5% 0.157 163.9)
-
Step 400
400
#00BD87
oklch(70.7% 0.15 164.1)
-
Step 500
500
#00A273
oklch(63.1% 0.134 164)
-
Step 600
600
#008860
oklch(55.5% 0.118 164)
-
Step 700
700
#007350
oklch(49.2% 0.105 163.6)
-
Step 800
800
#005E41
oklch(42.7% 0.091 163.9)
-
Step 900
900
#004F36
oklch(37.9% 0.081 163.8)
-
Step 950
950
#002F1F
oklch(27% 0.057 164.4)
#21D197 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) | #CDC194 | 0.154 |
| Deuteranopia (no green cones) | #B9B29B | 0.150 |
| Tritanopia (no blue cones) | #00D1C1 | 0.059 |
| Achromatopsia (no color) | #B8B8B8 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21D197
#21D197
oklch(76.5% 0.157 163.9)
- #F687CB
#F687CB
oklch(76.5% 0.156 343.9)
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 #21D197, closest first.
No curated palette has a color within ΔE 0.04 of #21D197.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Emerald #06D6A0 ΔE 0.015
- Greenblue #23C48B ΔE 0.037
- Seaweed #18D17B ΔE 0.037
- Aqua Green #12E193 ΔE 0.048
- Green Blue #01C08D ΔE 0.049
- Medium Aquamarine #66CDAA ΔE 0.050
- Dark Mint #48C072 ΔE 0.054
- Soft Green #6FC276 ΔE 0.055
Use #21D197 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.