#21C1AE
Closest named color: Topaz (#13BBAF). oklch(73% 0.125 182.2), rgb(33, 193, 174).
Aa
Black text reads best on this color (9.30:1).
About this color
#21C1AE is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 73%, its chroma 0.125 and its hue 182°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.019 away. Black text reads best on it, at 9.30:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.125) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 9.30:1 |
| White text | 2.25:1 |
Values
| HEX | #21C1AE |
| RGB | rgb(33, 193, 174) |
| HSL | hsl(173, 71%, 44%) |
| OKLCH | oklch(73% 0.125 182.2) |
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 #21C1AE | 2.25:1 | Fails | Lc -48.8 | Large or bold text, headings |
| Black text on #21C1AE | 9.30:1 | AAA | Lc 60.0 | Large or bold text, headings |
| #21C1AE text on white | 2.25:1 | Fails | Lc 44.0 | Non-text elements, placeholder text |
| #21C1AE text on black | 9.30:1 | AAA | Lc -58.2 | 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
#EEF8F6
oklch(97.1% 0.011 182.9)
-
Step 100
100
#DAEFEB
oklch(93.6% 0.023 183.2)
-
Step 200
200
#BBE3DB
oklch(88.5% 0.043 181.8)
-
Step 300
300
#85D2C4
oklch(81% 0.079 181.4)
-
Step 400
400 (this color)
#21C1AE
oklch(73% 0.125 182.2)
-
Step 500
500
#009F8F
oklch(63.1% 0.113 182.5)
-
Step 600
600
#008678
oklch(55.6% 0.1 182.2)
-
Step 700
700
#007165
oklch(49.2% 0.088 182.2)
-
Step 800
800
#005C52
oklch(42.6% 0.076 182.2)
-
Step 900
900
#004D44
oklch(37.7% 0.068 181.7)
-
Step 950
950
#002E28
oklch(27% 0.049 181.5)
#21C1AE 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) | #B8B5AD | 0.133 |
| Deuteranopia (no green cones) | #A3A6B0 | 0.126 |
| Tritanopia (no blue cones) | #00C5BB | 0.018 |
| Achromatopsia (no color) | #ACACAC | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21C1AE
#21C1AE
oklch(73% 0.125 182.2)
- #E885A1
#E885A1
oklch(73.1% 0.125 2.5)
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 #21C1AE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.019
- Light Sea Green #20B2AA ΔE 0.043
- Greeny Blue #42B395 ΔE 0.044
- Green Blue #01C08D ΔE 0.048
- Dark Turquoise #00CED1 ΔE 0.053
- Greenblue #23C48B ΔE 0.053
- Medium Aquamarine #66CDAA ΔE 0.056
- Medium Turquoise #48D1CC ΔE 0.060
Use #21C1AE 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.