#21C7CC
Closest named color: Dark Turquoise (#00CED1). oklch(75.5% 0.124 198.2), rgb(33, 199, 204).
Aa
Black text reads best on this color (10.10:1).
About this color
#21C7CC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 76%, its chroma 0.124 and its hue 198°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Turquoise (#00CED1), ΔE 0.019 away. Black text reads best on it, at 10.10:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Dark Turquoise (#00CED1) |
| Black text | 10.10:1 |
| White text | 2.07:1 |
Values
| HEX | #21C7CC |
| RGB | rgb(33, 199, 204) |
| HSL | hsl(182, 72%, 46%) |
| OKLCH | oklch(75.5% 0.124 198.2) |
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 #21C7CC | 2.07:1 | Fails | Lc -44.6 | Non-text elements, placeholder text |
| Black text on #21C7CC | 10.10:1 | AAA | Lc 63.9 | Content text, not long reading |
| #21C7CC text on white | 2.07:1 | Fails | Lc 40.1 | Non-text elements, placeholder text |
| #21C7CC text on black | 10.10:1 | AAA | Lc -62.2 | 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 400.
-
Step 50
50
#EEF8F8
oklch(97.2% 0.011 197)
-
Step 100
100
#DAEFEF
oklch(93.7% 0.022 196.8)
-
Step 200
200
#B9E2E3
oklch(88.4% 0.043 198.2)
-
Step 300
300
#82D0D3
oklch(80.8% 0.077 198.9)
-
Step 400
400 (this color)
#21C7CC
oklch(75.5% 0.124 198.2)
-
Step 500
500
#009DA1
oklch(63.2% 0.107 198)
-
Step 600
600
#008487
oklch(55.6% 0.095 197.6)
-
Step 700
700
#006F72
oklch(49.2% 0.084 198.1)
-
Step 800
800
#005B5D
oklch(42.7% 0.073 197.4)
-
Step 900
900
#004C4E
oklch(37.8% 0.064 197.8)
-
Step 950
950
#002D2F
oklch(27% 0.046 199.4)
#21C7CC 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) | #B8BDCD | 0.127 |
| Deuteranopia (no green cones) | #A2ADCD | 0.118 |
| Tritanopia (no blue cones) | #00CEC8 | 0.023 |
| Achromatopsia (no color) | #B4B4B4 | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21C7CC
#21C7CC
oklch(75.5% 0.124 198.2)
- #F48E92
#F48E92
oklch(75.6% 0.124 17.9)
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 #21C7CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Turquoise #00CED1 ΔE 0.019
- Medium Turquoise #48D1CC ΔE 0.035
- Topaz #13BBAF ΔE 0.048
- Aqua Blue #02D8E9 ΔE 0.054
- Vivid Sky Blue #4CC9F0 ΔE 0.058
- Turquoise Blue #06B1C4 ΔE 0.063
- Medium Aquamarine #66CDAA ΔE 0.064
- Light Sea Green #20B2AA ΔE 0.068
Use #21C7CC 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.