#21C591
Closest named color: Greenblue (#23C48B). oklch(73.2% 0.148 165), rgb(33, 197, 145).
Aa
Black text reads best on this color (9.46:1).
About this color
#21C591 is a medium-light, vivid green. In OKLCH its lightness is 73%, its chroma 0.148 and its hue 165°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Greenblue (#23C48B), ΔE 0.008 away. Black text reads best on it, at 9.46:1.
| Hue family | Greens |
| Lightness | medium-light (73%) |
| Chroma | vivid (0.148) |
| Temperature | in between |
| Nearest name | Greenblue (#23C48B) |
| Black text | 9.46:1 |
| White text | 2.21:1 |
Values
| HEX | #21C591 |
| RGB | rgb(33, 197, 145) |
| HSL | hsl(161, 71%, 45%) |
| OKLCH | oklch(73.2% 0.148 165) |
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 #21C591 | 2.21:1 | Fails | Lc -47.9 | Large or bold text, headings |
| Black text on #21C591 | 9.46:1 | AAA | Lc 60.8 | Content text, not long reading |
| #21C591 text on white | 2.21:1 | Fails | Lc 43.2 | Non-text elements, placeholder text |
| #21C591 text on black | 9.46:1 | AAA | Lc -59.0 | 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
#EEF8F3
oklch(97% 0.012 164.8)
-
Step 100
100
#DAF0E5
oklch(93.6% 0.027 164.4)
-
Step 200
200
#BBE4D1
oklch(88.4% 0.05 165.4)
-
Step 300
300
#85D4B2
oklch(80.9% 0.092 165.1)
-
Step 400
400 (this color)
#21C591
oklch(73.2% 0.148 165)
-
Step 500
500
#00A275
oklch(63.1% 0.133 165)
-
Step 600
600
#008862
oklch(55.5% 0.117 165.2)
-
Step 700
700
#007352
oklch(49.2% 0.104 164.9)
-
Step 800
800
#005E42
oklch(42.7% 0.09 164.7)
-
Step 900
900
#004E37
oklch(37.6% 0.079 165.5)
-
Step 950
950
#002F1F
oklch(27% 0.057 164.4)
#21C591 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) | #C1B68E | 0.146 |
| Deuteranopia (no green cones) | #AEA894 | 0.141 |
| Tritanopia (no blue cones) | #00C5B7 | 0.054 |
| Achromatopsia (no color) | #AEAEAE | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21C591
#21C591
oklch(73.2% 0.148 165)
- #E980BE
#E980BE
oklch(73.4% 0.148 345)
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 #21C591, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greenblue #23C48B ΔE 0.008
- Green Blue #01C08D ΔE 0.017
- Dark Mint #48C072 ΔE 0.038
- Dark Mint Green #20C073 ΔE 0.038
- Algae Green #21C36F ΔE 0.043
- Emerald #06D6A0 ΔE 0.047
- Dark Seafoam #1FB57A ΔE 0.049
- Soft Green #6FC276 ΔE 0.049
Use #21C591 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.