#21BBC1
Closest named color: Topaz (#13BBAF). oklch(72.2% 0.117 199.1), rgb(33, 187, 193).
Aa
Black text reads best on this color (8.94:1).
About this color
#21BBC1 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.117 and its hue 199°. Its hue sits on the cool side of the wheel. The nearest named color is Topaz (#13BBAF), ΔE 0.028 away. Black text reads best on it, at 8.94:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 8.94:1 |
| White text | 2.34:1 |
Values
| HEX | #21BBC1 |
| RGB | rgb(33, 187, 193) |
| HSL | hsl(182, 71%, 44%) |
| OKLCH | oklch(72.2% 0.117 199.1) |
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 #21BBC1 | 2.34:1 | Fails | Lc -50.7 | Large or bold text, headings |
| Black text on #21BBC1 | 8.94:1 | AAA | Lc 58.2 | Large or bold text, headings |
| #21BBC1 text on white | 2.34:1 | Fails | Lc 45.8 | Large or bold text, headings |
| #21BBC1 text on black | 8.94:1 | AAA | Lc -56.3 | 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
#EEF8F8
oklch(97.2% 0.011 197)
-
Step 100
100
#DAEEEF
oklch(93.5% 0.021 200.4)
-
Step 200
200
#BBE2E3
oklch(88.5% 0.041 198.4)
-
Step 300
300
#86CFD3
oklch(80.8% 0.073 200.2)
-
Step 400
400 (this color)
#21BBC1
oklch(72.2% 0.117 199.1)
-
Step 500
500
#009DA2
oklch(63.2% 0.107 198.8)
-
Step 600
600
#008488
oklch(55.7% 0.095 198.5)
-
Step 700
700
#006F73
oklch(49.2% 0.084 199.2)
-
Step 800
800
#005B5E
oklch(42.8% 0.073 198.7)
-
Step 900
900
#004C4E
oklch(37.8% 0.064 197.8)
-
Step 950
950
#002D2F
oklch(27% 0.046 199.4)
#21BBC1 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) | #ADB2C2 | 0.121 |
| Deuteranopia (no green cones) | #97A2C2 | 0.112 |
| Tritanopia (no blue cones) | #00C2BC | 0.024 |
| Achromatopsia (no color) | #A9A9A9 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21BBC1
#21BBC1
oklch(72.2% 0.117 199.1)
- #E58688
#E58688
oklch(72.2% 0.117 19)
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 #21BBC1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.028
- Turquoise Blue #06B1C4 ΔE 0.032
- Light Sea Green #20B2AA ΔE 0.037
- Dark Turquoise #00CED1 ΔE 0.052
- Greeny Blue #42B395 ΔE 0.060
- Medium Turquoise #48D1CC ΔE 0.067
- Vivid Sky Blue #4CC9F0 ΔE 0.078
- Medium Aquamarine #66CDAA ΔE 0.081
Use #21BBC1 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.