#21C588
Closest named color: Greenblue (#23C48B). oklch(73% 0.155 161.4), rgb(33, 197, 136).
Aa
Black text reads best on this color (9.40:1).
About this color
#21C588 is a medium-light, vivid green. In OKLCH its lightness is 73%, its chroma 0.155 and its hue 161°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Greenblue (#23C48B), ΔE 0.006 away. Black text reads best on it, at 9.40:1.
| Hue family | Greens |
| Lightness | medium-light (73%) |
| Chroma | vivid (0.155) |
| Temperature | in between |
| Nearest name | Greenblue (#23C48B) |
| Black text | 9.40:1 |
| White text | 2.23:1 |
Values
| HEX | #21C588 |
| RGB | rgb(33, 197, 136) |
| HSL | hsl(158, 71%, 45%) |
| OKLCH | oklch(73% 0.155 161.4) |
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 #21C588 | 2.23:1 | Fails | Lc -48.2 | Large or bold text, headings |
| Black text on #21C588 | 9.40:1 | AAA | Lc 60.5 | Content text, not long reading |
| #21C588 text on white | 2.23:1 | Fails | Lc 43.4 | Non-text elements, placeholder text |
| #21C588 text on black | 9.40:1 | AAA | Lc -58.7 | 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
#DAF0E4
oklch(93.6% 0.028 162.1)
-
Step 200
200
#BBE5CE
oklch(88.6% 0.054 161.1)
-
Step 300
300
#85D4AD
oklch(80.8% 0.096 161.8)
-
Step 400
400 (this color)
#21C588
oklch(73% 0.155 161.4)
-
Step 500
500
#00A36E
oklch(63.2% 0.14 161.4)
-
Step 600
600
#00895C
oklch(55.7% 0.123 161.5)
-
Step 700
700
#00734C
oklch(49.1% 0.109 161.2)
-
Step 800
800
#005E3E
oklch(42.6% 0.094 161.6)
-
Step 900
900
#004F33
oklch(37.8% 0.084 161.3)
-
Step 950
950
#002F1D
oklch(27% 0.059 161.7)
#21C588 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) | #C2B684 | 0.147 |
| Deuteranopia (no green cones) | #AFA88C | 0.143 |
| Tritanopia (no blue cones) | #00C4B5 | 0.064 |
| Achromatopsia (no color) | #ADADAD | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21C588
#21C588
oklch(73% 0.155 161.4)
- #E87DC4
#E87DC4
oklch(73% 0.156 341.4)
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 #21C588, closest first.
No curated palette has a color within ΔE 0.04 of #21C588.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greenblue #23C48B ΔE 0.006
- Green Blue #01C08D ΔE 0.019
- Dark Mint Green #20C073 ΔE 0.027
- Dark Mint #48C072 ΔE 0.027
- Algae Green #21C36F ΔE 0.031
- Seaweed #18D17B ΔE 0.043
- Soft Green #6FC276 ΔE 0.045
- Dark Seafoam #1FB57A ΔE 0.046
Use #21C588 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.