#21CBBB
Closest named color: Dark Turquoise (#00CED1). oklch(75.9% 0.129 184.6), rgb(33, 203, 187).
Aa
Black text reads best on this color (10.32:1).
About this color
#21CBBB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.129 and its hue 185°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Turquoise (#00CED1), ΔE 0.030 away. Black text reads best on it, at 10.32:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Dark Turquoise (#00CED1) |
| Black text | 10.32:1 |
| White text | 2.03:1 |
Values
| HEX | #21CBBB |
| RGB | rgb(33, 203, 187) |
| HSL | hsl(174, 72%, 46%) |
| OKLCH | oklch(75.9% 0.129 184.6) |
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 #21CBBB | 2.03:1 | Fails | Lc -43.5 | Non-text elements, placeholder text |
| Black text on #21CBBB | 10.32:1 | AAA | Lc 64.9 | Content text, not long reading |
| #21CBBB text on white | 2.03:1 | Fails | Lc 39.0 | Non-text elements, placeholder text |
| #21CBBB text on black | 10.32:1 | AAA | Lc -63.3 | 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 300.
-
Step 50
50
#E9F9F7
oklch(97% 0.017 187.9)
-
Step 100
100
#CFF3ED
oklch(93.7% 0.038 184.4)
-
Step 200
200
#A3E9DF
oklch(88.5% 0.071 184.9)
-
Step 300
300 (this color)
#21CBBB
oklch(75.9% 0.129 184.6)
-
Step 400
400
#00B9AA
oklch(70.6% 0.125 184.7)
-
Step 500
500
#009F92
oklch(63.2% 0.111 184.7)
-
Step 600
600
#00867A
oklch(55.7% 0.099 183.9)
-
Step 700
700
#007067
oklch(49% 0.086 185.2)
-
Step 800
800
#005C54
oklch(42.7% 0.075 184.7)
-
Step 900
900
#004D46
oklch(37.8% 0.067 184.5)
-
Step 950
950
#002E29
oklch(27.1% 0.048 183.6)
#21CBBB 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) | #C0BFBB | 0.137 |
| Deuteranopia (no green cones) | #ABAFBD | 0.130 |
| Tritanopia (no blue cones) | #00D0C6 | 0.017 |
| Achromatopsia (no color) | #B6B6B6 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21CBBB
#21CBBB
oklch(75.9% 0.129 184.6)
- #F58CA6
#F58CA6
oklch(75.9% 0.13 4.7)
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 #21CBBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Turquoise #00CED1 ΔE 0.030
- Medium Turquoise #48D1CC ΔE 0.034
- Medium Aquamarine #66CDAA ΔE 0.042
- Topaz #13BBAF ΔE 0.046
- Seafoam Blue #78D1B6 ΔE 0.056
- Emerald #06D6A0 ΔE 0.057
- Pale Teal #82CBB2 ΔE 0.060
- Turquoise #40E0D0 ΔE 0.063
Use #21CBBB 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.