#21C8A3
Closest named color: Greenblue (#23C48B). oklch(74.5% 0.138 172.4), rgb(33, 200, 163).
Aa
Black text reads best on this color (9.85:1).
About this color
#21C8A3 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.138 and its hue 172°. Its hue sits on the cool side of the wheel. The nearest named color is Greenblue (#23C48B), ΔE 0.032 away. Black text reads best on it, at 9.85:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Greenblue (#23C48B) |
| Black text | 9.85:1 |
| White text | 2.13:1 |
Values
| HEX | #21C8A3 |
| RGB | rgb(33, 200, 163) |
| HSL | hsl(167, 72%, 46%) |
| OKLCH | oklch(74.5% 0.138 172.4) |
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 #21C8A3 | 2.13:1 | Fails | Lc -45.9 | Large or bold text, headings |
| Black text on #21C8A3 | 9.85:1 | AAA | Lc 62.7 | Content text, not long reading |
| #21C8A3 text on white | 2.13:1 | Fails | Lc 41.3 | Non-text elements, placeholder text |
| #21C8A3 text on black | 9.85:1 | AAA | Lc -61.0 | 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
#EEF8F4
oklch(97.1% 0.012 170.3)
-
Step 100
100
#DAF0E8
oklch(93.7% 0.025 171.9)
-
Step 200
200
#BAE4D6
oklch(88.5% 0.048 172.9)
-
Step 300
300
#84D3BB
oklch(80.9% 0.086 172.8)
-
Step 400
400 (this color)
#21C8A3
oklch(74.5% 0.138 172.4)
-
Step 500
500
#00A182
oklch(63.2% 0.122 172.6)
-
Step 600
600
#00876D
oklch(55.6% 0.107 172.9)
-
Step 700
700
#00725B
oklch(49.2% 0.095 172.3)
-
Step 800
800
#005D4A
oklch(42.6% 0.082 172.5)
-
Step 900
900
#004E3D
oklch(37.8% 0.073 171.8)
-
Step 950
950
#002E24
oklch(26.9% 0.051 173.7)
#21C8A3 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) | #C1BAA1 | 0.142 |
| Deuteranopia (no green cones) | #ADACA6 | 0.136 |
| Tritanopia (no blue cones) | #00CABD | 0.036 |
| Achromatopsia (no color) | #B2B2B2 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21C8A3
#21C8A3
oklch(74.5% 0.138 172.4)
- #EE85B5
#EE85B5
oklch(74.4% 0.139 352.2)
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 #21C8A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greenblue #23C48B ΔE 0.032
- Green Blue #01C08D ΔE 0.035
- Emerald #06D6A0 ΔE 0.042
- Medium Aquamarine #66CDAA ΔE 0.043
- Topaz #13BBAF ΔE 0.047
- Greeny Blue #42B395 ΔE 0.057
- Dark Mint #48C072 ΔE 0.060
- Dark Mint Green #20C073 ΔE 0.063
Use #21C8A3 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.