#21CAAA
Closest named color: Medium Aquamarine (#66CDAA). oklch(75.2% 0.136 175.3), rgb(33, 202, 170).
Aa
Black text reads best on this color (10.09:1).
About this color
#21CAAA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.136 and its hue 175°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Aquamarine (#66CDAA), ΔE 0.039 away. Black text reads best on it, at 10.09:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Medium Aquamarine (#66CDAA) |
| Black text | 10.09:1 |
| White text | 2.08:1 |
Values
| HEX | #21CAAA |
| RGB | rgb(33, 202, 170) |
| HSL | hsl(169, 72%, 46%) |
| OKLCH | oklch(75.2% 0.136 175.3) |
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 #21CAAA | 2.08:1 | Fails | Lc -44.7 | Non-text elements, placeholder text |
| Black text on #21CAAA | 10.09:1 | AAA | Lc 63.8 | Content text, not long reading |
| #21CAAA text on white | 2.08:1 | Fails | Lc 40.1 | Non-text elements, placeholder text |
| #21CAAA text on black | 10.09:1 | AAA | Lc -62.2 | 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
#EEF8F5
oklch(97.1% 0.011 176.3)
-
Step 100
100
#DAF0E9
oklch(93.7% 0.025 174.7)
-
Step 200
200
#BAE4D7
oklch(88.5% 0.047 174.4)
-
Step 300
300
#83D3BE
oklch(80.9% 0.085 175.5)
-
Step 400
400 (this color)
#21CAAA
oklch(75.2% 0.136 175.3)
-
Step 500
500
#00A086
oklch(63% 0.118 175.6)
-
Step 600
600
#008770
oklch(55.7% 0.105 175.1)
-
Step 700
700
#00715E
oklch(49% 0.092 175.6)
-
Step 800
800
#005D4D
oklch(42.7% 0.08 175.6)
-
Step 900
900
#004E40
oklch(37.9% 0.071 175.3)
-
Step 950
950
#002E25
oklch(26.9% 0.05 175.6)
#21CAAA 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) | #C2BDA9 | 0.141 |
| Deuteranopia (no green cones) | #AEADAC | 0.137 |
| Tritanopia (no blue cones) | #00CDC1 | 0.031 |
| Achromatopsia (no color) | #B4B4B4 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21CAAA
#21CAAA
oklch(75.2% 0.136 175.3)
- #F188B2
#F188B2
oklch(75.2% 0.136 355.5)
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 #21CAAA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Aquamarine #66CDAA ΔE 0.039
- Emerald #06D6A0 ΔE 0.041
- Greenblue #23C48B ΔE 0.042
- Green Blue #01C08D ΔE 0.045
- Topaz #13BBAF ΔE 0.047
- Dark Turquoise #00CED1 ΔE 0.054
- Medium Turquoise #48D1CC ΔE 0.054
- Seafoam Blue #78D1B6 ΔE 0.061
Use #21CAAA 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.