#21AD8A
Closest named color: Greeny Blue (#42B395). oklch(66.9% 0.124 170.6), rgb(33, 173, 138).
Aa
Black text reads best on this color (7.40:1).
About this color
#21AD8A is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 67%, its chroma 0.124 and its hue 171°. Its hue sits on the cool side of the wheel. The nearest named color is Greeny Blue (#42B395), ΔE 0.029 away. Black text reads best on it, at 7.40:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Greeny Blue (#42B395) |
| Black text | 7.40:1 |
| White text | 2.83:1 |
Values
| HEX | #21AD8A |
| RGB | rgb(33, 173, 138) |
| HSL | hsl(165, 68%, 40%) |
| OKLCH | oklch(66.9% 0.124 170.6) |
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 #21AD8A | 2.83:1 | Fails | Lc -59.2 | Large or bold text, headings |
| Black text on #21AD8A | 7.40:1 | AAA | Lc 50.1 | Large or bold text, headings |
| #21AD8A text on white | 2.83:1 | Fails | Lc 53.9 | Large or bold text, headings |
| #21AD8A text on black | 7.40:1 | AAA | Lc -47.9 | 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 500.
-
Step 50
50
#F0F7F5
oklch(97% 0.008 177.3)
-
Step 100
100
#DFEEE8
oklch(93.6% 0.018 170.1)
-
Step 200
200
#C4E1D6
oklch(88.5% 0.034 170.7)
-
Step 300
300
#99CEBB
oklch(80.9% 0.061 170.6)
-
Step 400
400
#5AB498
oklch(70.6% 0.097 170.8)
-
Step 500
500 (this color)
#21AD8A
oklch(66.9% 0.124 170.6)
-
Step 600
600
#00876A
oklch(55.5% 0.109 170.8)
-
Step 700
700
#007259
oklch(49.1% 0.097 170.7)
-
Step 800
800
#005D48
oklch(42.6% 0.084 170.6)
-
Step 900
900
#004E3C
oklch(37.7% 0.074 170.6)
-
Step 950
950
#022E23
oklch(26.9% 0.051 171.4)
#21AD8A 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) | #A8A188 | 0.127 |
| Deuteranopia (no green cones) | #97948C | 0.123 |
| Tritanopia (no blue cones) | #00AEA3 | 0.036 |
| Achromatopsia (no color) | #999999 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21AD8A
#21AD8A
oklch(66.9% 0.124 170.6)
- #CD739F
#CD739F
oklch(66.8% 0.124 350.3)
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 #21AD8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greeny Blue #42B395 ΔE 0.029
- Bluey Green #2BB179 ΔE 0.030
- Dark Seafoam Green #3EAF76 ΔE 0.031
- Jade #1FA774 ΔE 0.031
- Dark Seafoam #1FB57A ΔE 0.038
- Green Teal #0CB577 ΔE 0.041
- Seaweed Green #35AD6B ΔE 0.042
- Tea #65AB7C ΔE 0.043
Use #21AD8A 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.