#21BFEB
Closest named color: Deep Sky Blue (#00BFFF). oklch(74.8% 0.134 223.2), rgb(33, 191, 235).
Aa
Black text reads best on this color (9.71:1).
About this color
#21BFEB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.134 and its hue 223°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.030 away. Black text reads best on it, at 9.71:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.71:1 |
| White text | 2.16:1 |
Values
| HEX | #21BFEB |
| RGB | rgb(33, 191, 235) |
| HSL | hsl(193, 83%, 53%) |
| OKLCH | oklch(74.8% 0.134 223.2) |
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 #21BFEB | 2.16:1 | Fails | Lc -46.6 | Large or bold text, headings |
| Black text on #21BFEB | 9.71:1 | AAA | Lc 62.0 | Content text, not long reading |
| #21BFEB text on white | 2.16:1 | Fails | Lc 41.9 | Non-text elements, placeholder text |
| #21BFEB text on black | 9.71:1 | AAA | Lc -60.3 | 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
#EEF7FB
oklch(97.1% 0.011 226)
-
Step 100
100
#D9EEF6
oklch(93.6% 0.025 222.6)
-
Step 200
200
#B9E1F0
oklch(88.6% 0.047 222.6)
-
Step 300
300
#82CDE8
oklch(80.9% 0.084 222.9)
-
Step 400
400 (this color)
#21BFEB
oklch(74.8% 0.134 223.2)
-
Step 500
500
#0098BD
oklch(63.1% 0.118 223.1)
-
Step 600
600
#00809F
oklch(55.6% 0.103 222.6)
-
Step 700
700
#006B86
oklch(49% 0.091 223.1)
-
Step 800
800
#00586F
oklch(42.7% 0.08 223.4)
-
Step 900
900
#00495D
oklch(37.7% 0.071 223.8)
-
Step 950
950
#002B38
oklch(26.8% 0.05 223.6)
#21BFEB 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) | #A6BAED | 0.106 |
| Deuteranopia (no green cones) | #8DA8EB | 0.094 |
| Tritanopia (no blue cones) | #00CCCD | 0.066 |
| Achromatopsia (no color) | #B0B0B0 | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21BFEB
#21BFEB
oklch(74.8% 0.134 223.2)
- #F38F65
#F38F65
oklch(74.7% 0.134 43.1)
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 #21BFEB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.030
- Vivid Sky Blue #4CC9F0 ΔE 0.036
- Bright Sky Blue #02CCFE ΔE 0.039
- Turquoise Blue #06B1C4 ΔE 0.064
- Dark Turquoise #00CED1 ΔE 0.065
- Lightblue #7BC8F6 ΔE 0.067
- Aqua Blue #02D8E9 ΔE 0.071
- Sky #82CAFC ΔE 0.078
Use #21BFEB 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.