#21BBEC
Closest named color: Deep Sky Blue (#00BFFF). oklch(74% 0.136 226.3), rgb(33, 187, 236).
Aa
Black text reads best on this color (9.38:1).
About this color
#21BBEC is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.136 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.027 away. Black text reads best on it, at 9.38:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.38:1 |
| White text | 2.23:1 |
Values
| HEX | #21BBEC |
| RGB | rgb(33, 187, 236) |
| HSL | hsl(194, 84%, 53%) |
| OKLCH | oklch(74% 0.136 226.3) |
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 #21BBEC | 2.23:1 | Fails | Lc -48.3 | Large or bold text, headings |
| Black text on #21BBEC | 9.38:1 | AAA | Lc 60.4 | Content text, not long reading |
| #21BBEC text on white | 2.23:1 | Fails | Lc 43.6 | Non-text elements, placeholder text |
| #21BBEC text on black | 9.38:1 | AAA | Lc -58.6 | 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
#EEF7FB
oklch(97.1% 0.011 226)
-
Step 100
100
#DAEEF7
oklch(93.7% 0.024 226.5)
-
Step 200
200
#B9E0F1
oklch(88.4% 0.047 226.2)
-
Step 300
300
#83CCEB
oklch(80.8% 0.085 226.8)
-
Step 400
400 (this color)
#21BBEC
oklch(74% 0.136 226.3)
-
Step 500
500
#0097C1
oklch(63% 0.121 226.4)
-
Step 600
600
#007FA3
oklch(55.6% 0.107 226.4)
-
Step 700
700
#006B89
oklch(49.1% 0.094 225.7)
-
Step 800
800
#005771
oklch(42.6% 0.082 226.6)
-
Step 900
900
#00495F
oklch(37.8% 0.072 226.2)
-
Step 950
950
#002B3A
oklch(27% 0.052 227.2)
#21BBEC 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) | #A0B7EE | 0.100 |
| Deuteranopia (no green cones) | #87A5EB | 0.088 |
| Tritanopia (no blue cones) | #00C9CB | 0.072 |
| Achromatopsia (no color) | #ADADAD | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21BBEC
#21BBEC
oklch(74% 0.136 226.3)
- #F08D5C
#F08D5C
oklch(73.9% 0.137 46.2)
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 #21BBEC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.027
- Vivid Sky Blue #4CC9F0 ΔE 0.046
- Bright Sky Blue #02CCFE ΔE 0.047
- Turquoise Blue #06B1C4 ΔE 0.061
- Lightblue #7BC8F6 ΔE 0.073
- Dark Turquoise #00CED1 ΔE 0.076
- Carolina Blue #8AB8FE ΔE 0.082
- Aqua Blue #02D8E9 ΔE 0.083
Use #21BBEC 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.