#21C2A8
Closest named color: Topaz (#13BBAF). oklch(73.1% 0.129 178), rgb(33, 194, 168).
Aa
Black text reads best on this color (9.34:1).
About this color
#21C2A8 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.129 and its hue 178°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.026 away. Black text reads best on it, at 9.34:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.34:1 |
| White text | 2.24:1 |
Values
| HEX | #21C2A8 |
| RGB | rgb(33, 194, 168) |
| HSL | hsl(170, 71%, 45%) |
| OKLCH | oklch(73.1% 0.129 178) |
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 #21C2A8 | 2.24:1 | Fails | Lc -48.5 | Large or bold text, headings |
| Black text on #21C2A8 | 9.34:1 | AAA | Lc 60.2 | Content text, not long reading |
| #21C2A8 text on white | 2.24:1 | Fails | Lc 43.8 | Non-text elements, placeholder text |
| #21C2A8 text on black | 9.34:1 | AAA | Lc -58.4 | 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
#EEF8F5
oklch(97.1% 0.011 176.3)
-
Step 100
100
#DAEFEA
oklch(93.5% 0.023 179.9)
-
Step 200
200
#BBE3D9
oklch(88.4% 0.044 178.4)
-
Step 300
300
#85D2C0
oklch(80.9% 0.081 177.7)
-
Step 400
400 (this color)
#21C2A8
oklch(73.1% 0.129 178)
-
Step 500
500
#00A089
oklch(63.1% 0.116 177.6)
-
Step 600
600
#008673
oklch(55.5% 0.102 178.1)
-
Step 700
700
#007161
oklch(49.1% 0.09 178.4)
-
Step 800
800
#005D4F
oklch(42.8% 0.079 177.8)
-
Step 900
900
#004D42
oklch(37.6% 0.069 179)
-
Step 950
950
#002E26
oklch(26.9% 0.05 177.5)
#21C2A8 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) | #BAB5A7 | 0.136 |
| Deuteranopia (no green cones) | #A6A7AA | 0.129 |
| Tritanopia (no blue cones) | #00C5BA | 0.024 |
| Achromatopsia (no color) | #ADADAD | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21C2A8
#21C2A8
oklch(73.1% 0.129 178)
- #E884A8
#E884A8
oklch(73.1% 0.129 357.8)
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 #21C2A8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.026
- Green Blue #01C08D ΔE 0.039
- Greeny Blue #42B395 ΔE 0.042
- Greenblue #23C48B ΔE 0.043
- Light Sea Green #20B2AA ΔE 0.048
- Medium Aquamarine #66CDAA ΔE 0.053
- Dark Turquoise #00CED1 ΔE 0.059
- Emerald #06D6A0 ΔE 0.062
Use #21C2A8 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.