#21E1DF
Closest named color: Turquoise (#40E0D0). oklch(82.5% 0.137 193.7), rgb(33, 225, 223).
Aa
Black text reads best on this color (12.90:1).
About this color
#21E1DF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 82%, its chroma 0.137 and its hue 194°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise (#40E0D0), ΔE 0.021 away. Black text reads best on it, at 12.90:1.
| Hue family | Teals and cyans |
| Lightness | light (82%) |
| Chroma | moderately saturated (0.137) |
| Temperature | cool |
| Nearest name | Turquoise (#40E0D0) |
| Black text | 12.90:1 |
| White text | 1.62:1 |
Values
| HEX | #21E1DF |
| RGB | rgb(33, 225, 223) |
| HSL | hsl(179, 76%, 51%) |
| OKLCH | oklch(82.5% 0.137 193.7) |
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 #21E1DF | 1.62:1 | Fails | Lc -31.0 | Non-text elements, placeholder text |
| Black text on #21E1DF | 12.90:1 | AAA | Lc 76.4 | Fine for body text |
| #21E1DF text on white | 1.62:1 | Fails | Lc 27.4 | Dividers and decoration only |
| #21E1DF text on black | 12.90:1 | AAA | Lc -75.5 | Fine for body text |
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
#CDF3F1
oklch(93.7% 0.039 192.6)
-
Step 200
200
#9CEAE7
oklch(88.6% 0.077 192.8)
-
Step 300
300 (this color)
#21E1DF
oklch(82.5% 0.137 193.7)
-
Step 400
400
#00B8B6
oklch(70.8% 0.121 193.4)
-
Step 500
500
#009D9C
oklch(63% 0.108 194)
-
Step 600
600
#008483
oklch(55.5% 0.095 193.8)
-
Step 700
700
#006F6E
oklch(49% 0.084 193.7)
-
Step 800
800
#005B5A
oklch(42.6% 0.073 193.5)
-
Step 900
900
#004C4B
oklch(37.7% 0.064 193.2)
-
Step 950
950
#002D2D
oklch(26.9% 0.046 194.8)
#21E1DF 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) | #D2D5DF | 0.144 |
| Deuteranopia (no green cones) | #B9C3E0 | 0.134 |
| Tritanopia (no blue cones) | #00E8E0 | 0.019 |
| Achromatopsia (no color) | #CBCBCB | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21E1DF
#21E1DF
oklch(82.5% 0.137 193.7)
- #FFABB3
#FFABB3
oklch(82.5% 0.099 13.2)
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 #21E1DF, closest first.
No curated palette has a color within ΔE 0.04 of #21E1DF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise #40E0D0 ΔE 0.021
- Aqua Blue #02D8E9 ΔE 0.033
- Medium Turquoise #48D1CC ΔE 0.044
- Dark Turquoise #00CED1 ΔE 0.054
- Aqua Marine #2EE8BB ΔE 0.060
- Bright Aqua #0BF9EA ΔE 0.064
- Bright Light Blue #26F7FD ΔE 0.065
- Robin's Egg #6DEDFD ΔE 0.065
Use #21E1DF 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.