#21DBB0
Closest named color: Emerald (#06D6A0). oklch(79.6% 0.151 171.3), rgb(33, 219, 176).
Aa
Black text reads best on this color (11.82:1).
About this color
#21DBB0 is a light, vivid teal or cyan. In OKLCH its lightness is 80%, its chroma 0.151 and its hue 171°. Its hue sits on the cool side of the wheel. The nearest named color is Emerald (#06D6A0), ΔE 0.024 away. Black text reads best on it, at 11.82:1.
| Hue family | Teals and cyans |
| Lightness | light (80%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Emerald (#06D6A0) |
| Black text | 11.82:1 |
| White text | 1.77:1 |
Values
| HEX | #21DBB0 |
| RGB | rgb(33, 219, 176) |
| HSL | hsl(166, 74%, 49%) |
| OKLCH | oklch(79.6% 0.151 171.3) |
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 #21DBB0 | 1.77:1 | Fails | Lc -36.1 | Non-text elements, placeholder text |
| Black text on #21DBB0 | 11.82:1 | AAA | Lc 71.7 | Content text, not long reading |
| #21DBB0 text on white | 1.77:1 | Fails | Lc 32.1 | Non-text elements, placeholder text |
| #21DBB0 text on black | 11.82:1 | AAA | Lc -70.6 | 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
#E9FAF4
oklch(97.1% 0.02 172.8)
-
Step 100
100
#CEF4E6
oklch(93.6% 0.044 171)
-
Step 200
200
#9FECD2
oklch(88.6% 0.084 171.1)
-
Step 300
300 (this color)
#21DBB0
oklch(79.6% 0.151 171.3)
-
Step 400
400
#00BC95
oklch(70.8% 0.139 170.9)
-
Step 500
500
#00A180
oklch(63.1% 0.123 171.4)
-
Step 600
600
#00876B
oklch(55.5% 0.108 171.4)
-
Step 700
700
#00725A
oklch(49.2% 0.096 171.5)
-
Step 800
800
#005D49
oklch(42.6% 0.083 171.6)
-
Step 900
900
#004E3C
oklch(37.7% 0.074 170.6)
-
Step 950
950
#002F23
oklch(27.2% 0.053 170.5)
#21DBB0 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) | #D4CCAE | 0.154 |
| Deuteranopia (no green cones) | #BEBCB3 | 0.148 |
| Tritanopia (no blue cones) | #00DDCF | 0.042 |
| Achromatopsia (no color) | #C2C2C2 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21DBB0
#21DBB0
oklch(79.6% 0.151 171.3)
- #FF96C7
#FF96C7
oklch(79.6% 0.138 351.3)
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 #21DBB0, closest first.
No curated palette has a color within ΔE 0.04 of #21DBB0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Emerald #06D6A0 ΔE 0.024
- Aqua Marine #2EE8BB ΔE 0.037
- Medium Aquamarine #66CDAA ΔE 0.045
- Turquoise #40E0D0 ΔE 0.047
- Aqua Green #12E193 ΔE 0.048
- Seafoam Blue #78D1B6 ΔE 0.056
- Medium Turquoise #48D1CC ΔE 0.059
- Seaweed #18D17B ΔE 0.068
Use #21DBB0 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.