#21DFDF
Closest named color: Turquoise (#40E0D0). oklch(82% 0.136 194.8), rgb(33, 223, 223).
Aa
Black text reads best on this color (12.68:1).
About this color
#21DFDF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 82%, its chroma 0.136 and its hue 195°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise (#40E0D0), ΔE 0.023 away. Black text reads best on it, at 12.68:1.
| Hue family | Teals and cyans |
| Lightness | light (82%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Turquoise (#40E0D0) |
| Black text | 12.68:1 |
| White text | 1.65:1 |
Values
| HEX | #21DFDF |
| RGB | rgb(33, 223, 223) |
| HSL | hsl(180, 75%, 50%) |
| OKLCH | oklch(82% 0.136 194.8) |
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 #21DFDF | 1.65:1 | Fails | Lc -32.0 | Non-text elements, placeholder text |
| Black text on #21DFDF | 12.68:1 | AAA | Lc 75.4 | Fine for body text |
| #21DFDF text on white | 1.65:1 | Fails | Lc 28.4 | Dividers and decoration only |
| #21DFDF text on black | 12.68:1 | AAA | Lc -74.5 | 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
#E8FAF9
oklch(97.2% 0.019 192.8)
-
Step 100
100
#CDF3F2
oklch(93.7% 0.039 194.5)
-
Step 200
200
#9DE9E8
oklch(88.4% 0.075 194.8)
-
Step 300
300 (this color)
#21DFDF
oklch(82% 0.136 194.8)
-
Step 400
400
#00B7B8
oklch(70.6% 0.12 195.5)
-
Step 500
500
#009D9D
oklch(63% 0.108 194.8)
-
Step 600
600
#008484
oklch(55.5% 0.095 194.8)
-
Step 700
700
#006F6F
oklch(49% 0.084 194.8)
-
Step 800
800
#005B5B
oklch(42.7% 0.073 194.8)
-
Step 900
900
#004C4C
oklch(37.7% 0.064 194.8)
-
Step 950
950
#002D2D
oklch(26.9% 0.046 194.8)
#21DFDF 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) | #D0D4DF | 0.142 |
| Deuteranopia (no green cones) | #B7C1E0 | 0.133 |
| Tritanopia (no blue cones) | #00E6DF | 0.020 |
| Achromatopsia (no color) | #C9C9C9 | 0.137 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21DFDF
#21DFDF
oklch(82% 0.136 194.8)
- #FFA9AF
#FFA9AF
oklch(82% 0.102 15)
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 #21DFDF, closest first.
No curated palette has a color within ΔE 0.04 of #21DFDF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise #40E0D0 ΔE 0.023
- Aqua Blue #02D8E9 ΔE 0.028
- Medium Turquoise #48D1CC ΔE 0.039
- Dark Turquoise #00CED1 ΔE 0.049
- Aqua Marine #2EE8BB ΔE 0.064
- Seafoam Blue #78D1B6 ΔE 0.065
- Robin's Egg #6DEDFD ΔE 0.068
- Bright Light Blue #26F7FD ΔE 0.069
Use #21DFDF 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.