#21DFD7
Closest named color: Turquoise (#40E0D0). oklch(81.7% 0.137 190.1), rgb(33, 223, 215).
Aa
Black text reads best on this color (12.60:1).
About this color
#21DFD7 is a light, moderately saturated teal or cyan. In OKLCH its lightness is 82%, its chroma 0.137 and its hue 190°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise (#40E0D0), ΔE 0.014 away. Black text reads best on it, at 12.60:1.
| Hue family | Teals and cyans |
| Lightness | light (82%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Turquoise (#40E0D0) |
| Black text | 12.60:1 |
| White text | 1.66:1 |
Values
| HEX | #21DFD7 |
| RGB | rgb(33, 223, 215) |
| HSL | hsl(177, 75%, 50%) |
| OKLCH | oklch(81.7% 0.137 190.1) |
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 #21DFD7 | 1.66:1 | Fails | Lc -32.4 | Non-text elements, placeholder text |
| Black text on #21DFD7 | 12.60:1 | AAA | Lc 75.1 | Fine for body text |
| #21DFD7 text on white | 1.66:1 | Fails | Lc 28.7 | Dividers and decoration only |
| #21DFD7 text on black | 12.60:1 | AAA | Lc -74.2 | 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
#E8FAF8
oklch(97.1% 0.019 188.8)
-
Step 100
100
#CDF3F0
oklch(93.6% 0.039 190.6)
-
Step 200
200
#9DEAE4
oklch(88.5% 0.076 189.7)
-
Step 300
300 (this color)
#21DFD7
oklch(81.7% 0.137 190.1)
-
Step 400
400
#00B8B1
oklch(70.6% 0.122 190)
-
Step 500
500
#009E98
oklch(63.1% 0.109 190)
-
Step 600
600
#008580
oklch(55.7% 0.096 190.1)
-
Step 700
700
#00706B
oklch(49.2% 0.085 189.4)
-
Step 800
800
#005C58
oklch(42.8% 0.074 189.6)
-
Step 900
900
#004C49
oklch(37.6% 0.065 190.2)
-
Step 950
950
#002E2B
oklch(27.1% 0.047 188)
#21DFD7 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) | #D1D3D7 | 0.144 |
| Deuteranopia (no green cones) | #B9C1D8 | 0.135 |
| Tritanopia (no blue cones) | #00E5DC | 0.016 |
| Achromatopsia (no color) | #C8C8C8 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21DFD7
#21DFD7
oklch(81.7% 0.137 190.1)
- #FFA7B4
#FFA7B4
oklch(81.8% 0.105 10)
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 #21DFD7, closest first.
No curated palette has a color within ΔE 0.04 of #21DFD7.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise #40E0D0 ΔE 0.014
- Medium Turquoise #48D1CC ΔE 0.037
- Aqua Blue #02D8E9 ΔE 0.037
- Dark Turquoise #00CED1 ΔE 0.048
- Aqua Marine #2EE8BB ΔE 0.053
- Seafoam Blue #78D1B6 ΔE 0.059
- Medium Aquamarine #66CDAA ΔE 0.067
- Bright Aqua #0BF9EA ΔE 0.070
Use #21DFD7 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.