#21B0CA
Closest named color: Turquoise Blue (#06B1C4). oklch(69.8% 0.117 214), rgb(33, 176, 202).
Aa
Black text reads best on this color (8.12:1).
About this color
#21B0CA is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 70%, its chroma 0.117 and its hue 214°. Its hue sits on the cool side of the wheel. The nearest named color is Turquoise Blue (#06B1C4), ΔE 0.012 away. Black text reads best on it, at 8.12:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.117) |
| Temperature | cool |
| Nearest name | Turquoise Blue (#06B1C4) |
| Black text | 8.12:1 |
| White text | 2.58:1 |
Values
| HEX | #21B0CA |
| RGB | rgb(33, 176, 202) |
| HSL | hsl(189, 72%, 46%) |
| OKLCH | oklch(69.8% 0.117 214) |
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 #21B0CA | 2.58:1 | Fails | Lc -55.1 | Large or bold text, headings |
| Black text on #21B0CA | 8.12:1 | AAA | Lc 54.0 | Large or bold text, headings |
| #21B0CA text on white | 2.58:1 | Fails | Lc 50.0 | Large or bold text, headings |
| #21B0CA text on black | 8.12:1 | AAA | Lc -51.9 | 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
#EFF7F9
oklch(97.1% 0.009 214.3)
-
Step 100
100
#DBEEF2
oklch(93.6% 0.021 211.8)
-
Step 200
200
#BCE1EA
oklch(88.6% 0.041 214.1)
-
Step 300
300
#88CDDD
oklch(80.8% 0.073 213.9)
-
Step 400
400 (this color)
#21B0CA
oklch(69.8% 0.117 214)
-
Step 500
500
#009AB2
oklch(63.1% 0.111 213.9)
-
Step 600
600
#008196
oklch(55.5% 0.098 214.4)
-
Step 700
700
#006D7E
oklch(49.1% 0.086 213.3)
-
Step 800
800
#005968
oklch(42.7% 0.075 214.2)
-
Step 900
900
#004A57
oklch(37.6% 0.066 214.5)
-
Step 950
950
#002C34
oklch(26.9% 0.047 213.2)
#21B0CA 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) | #9DAACB | 0.105 |
| Deuteranopia (no green cones) | #889ACA | 0.096 |
| Tritanopia (no blue cones) | #00BAB8 | 0.046 |
| Achromatopsia (no color) | #A1A1A1 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21B0CA
#21B0CA
oklch(69.8% 0.117 214)
- #DC826D
#DC826D
oklch(69.8% 0.116 34)
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 #21B0CA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Turquoise Blue #06B1C4 ΔE 0.012
- Light Sea Green #20B2AA ΔE 0.051
- Topaz #13BBAF ΔE 0.059
- Greyblue #77A1B5 ΔE 0.067
- Cadet Blue #5F9EA0 ΔE 0.070
- Deep Sky Blue #00BFFF ΔE 0.079
- Bluegrey #85A3B2 ΔE 0.079
- Greeny Blue #42B395 ΔE 0.082
Use #21B0CA 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.