#21BBC0
Closest named color: Topaz (#13BBAF). oklch(72.2% 0.117 198.4), rgb(33, 187, 192).
Aa
Black text reads best on this color (8.93:1).
About this color
#21BBC0 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 72%, its chroma 0.117 and its hue 198°. 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 8.93:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (72%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Topaz (#13BBAF) |
| Black text | 8.93:1 |
| White text | 2.35:1 |
Values
| HEX | #21BBC0 |
| RGB | rgb(33, 187, 192) |
| HSL | hsl(182, 71%, 44%) |
| OKLCH | oklch(72.2% 0.117 198.4) |
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 #21BBC0 | 2.35:1 | Fails | Lc -50.7 | Large or bold text, headings |
| Black text on #21BBC0 | 8.93:1 | AAA | Lc 58.1 | Large or bold text, headings |
| #21BBC0 text on white | 2.35:1 | Fails | Lc 45.8 | Large or bold text, headings |
| #21BBC0 text on black | 8.93:1 | AAA | Lc -56.2 | 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
#EEF8F8
oklch(97.2% 0.011 197)
-
Step 100
100
#DAEFEF
oklch(93.7% 0.022 196.8)
-
Step 200
200
#BBE2E3
oklch(88.5% 0.041 198.4)
-
Step 300
300
#86D0D2
oklch(81% 0.074 198)
-
Step 400
400 (this color)
#21BBC0
oklch(72.2% 0.117 198.4)
-
Step 500
500
#009DA1
oklch(63.2% 0.107 198)
-
Step 600
600
#008488
oklch(55.7% 0.095 198.5)
-
Step 700
700
#006F72
oklch(49.2% 0.084 198.1)
-
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)
#21BBC0 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) | #ADB2C1 | 0.121 |
| Deuteranopia (no green cones) | #98A2C1 | 0.113 |
| Tritanopia (no blue cones) | #00C2BC | 0.023 |
| Achromatopsia (no color) | #A9A9A9 | 0.118 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21BBC0
#21BBC0
oklch(72.2% 0.117 198.4)
- #E58689
#E58689
oklch(72.2% 0.117 18.3)
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 #21BBC0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Topaz #13BBAF ΔE 0.026
- Turquoise Blue #06B1C4 ΔE 0.033
- Light Sea Green #20B2AA ΔE 0.036
- Dark Turquoise #00CED1 ΔE 0.052
- Greeny Blue #42B395 ΔE 0.059
- Medium Turquoise #48D1CC ΔE 0.067
- Vivid Sky Blue #4CC9F0 ΔE 0.079
- Medium Aquamarine #66CDAA ΔE 0.080
Use #21BBC0 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.