#21ADCD
Closest named color: Turquoise Blue (#06B1C4). oklch(69.2% 0.118 218.4), rgb(33, 173, 205).
Aa
Black text reads best on this color (7.92:1).
About this color
#21ADCD is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 69%, its chroma 0.118 and its hue 218°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.021 away. Black text reads best on it, at 7.92:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (69%) |
| Chroma | moderately saturated (0.118) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 7.92:1 |
| White text | 2.65:1 |
Values
| HEX | #21ADCD |
| RGB | rgb(33, 173, 205) |
| HSL | hsl(191, 72%, 47%) |
| OKLCH | oklch(69.2% 0.118 218.4) |
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 #21ADCD | 2.65:1 | Fails | Lc -56.3 | Large or bold text, headings |
| Black text on #21ADCD | 7.92:1 | AAA | Lc 52.9 | Large or bold text, headings |
| #21ADCD text on white | 2.65:1 | Fails | Lc 51.1 | Large or bold text, headings |
| #21ADCD text on black | 7.92:1 | AAA | Lc -50.8 | Large or bold text, headings |
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 400.
-
Step 50
50
#EFF7FA
oklch(97.1% 0.009 222.1)
-
Step 100
100
#DBEEF4
oklch(93.7% 0.022 218.6)
-
Step 200
200
#BCE0EB
oklch(88.4% 0.041 218.2)
-
Step 300
300
#89CDE1
oklch(81% 0.074 218.3)
-
Step 400
400 (this color)
#21ADCD
oklch(69.2% 0.118 218.4)
-
Step 500
500
#0099B7
oklch(63.1% 0.114 218.3)
-
Step 600
600
#00819A
oklch(55.7% 0.1 217.7)
-
Step 700
700
#006C82
oklch(49.1% 0.088 218.4)
-
Step 800
800
#00596B
oklch(42.8% 0.077 217.7)
-
Step 900
900
#004A5A
oklch(37.8% 0.068 218.5)
-
Step 950
950
#002C36
oklch(27% 0.048 217.4)
#21ADCD 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) | #99A8CF | 0.101 |
| Deuteranopia (no green cones) | #8398CD | 0.090 |
| Tritanopia (no blue cones) | #00B8B7 | 0.053 |
| Achromatopsia (no color) | #9F9F9F | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21ADCD
#21ADCD
oklch(69.2% 0.118 218.4)
- #DA8164
#DA8164
oklch(69.2% 0.118 38.8)
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 #21ADCD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.021
- Light Sea Green #20B2AA ΔE 0.059
- Greyblue #77A1B5 ΔE 0.066
- Topaz #13BBAF ΔE 0.070
- Cadet Blue #5F9EA0 ΔE 0.071
- Deep Sky Blue #00BFFF ΔE 0.078
- Bluegrey #85A3B2 ΔE 0.080
- Bluey Grey #89A0B0 ΔE 0.086
Use #21ADCD 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.