#21BDF2
Closest named color: Deep Sky Blue (#00BFFF). oklch(74.7% 0.14 228.1), rgb(33, 189, 242).
Aa
Black text reads best on this color (9.62:1).
About this color
#21BDF2 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.140 and its hue 228°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.018 away. Black text reads best on it, at 9.62:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.140) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.62:1 |
| White text | 2.18:1 |
Values
| HEX | #21BDF2 |
| RGB | rgb(33, 189, 242) |
| HSL | hsl(195, 89%, 54%) |
| OKLCH | oklch(74.7% 0.14 228.1) |
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 #21BDF2 | 2.18:1 | Fails | Lc -47.1 | Large or bold text, headings |
| Black text on #21BDF2 | 9.62:1 | AAA | Lc 61.6 | Content text, not long reading |
| #21BDF2 text on white | 2.18:1 | Fails | Lc 42.4 | Non-text elements, placeholder text |
| #21BDF2 text on black | 9.62:1 | AAA | Lc -59.8 | 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
#EEF7FC
oklch(97.1% 0.012 231.7)
-
Step 100
100
#D9EEF7
oklch(93.6% 0.025 225.3)
-
Step 200
200
#B9E0F3
oklch(88.5% 0.049 229)
-
Step 300
300
#82CCED
oklch(80.9% 0.087 228.1)
-
Step 400
400 (this color)
#21BDF2
oklch(74.7% 0.14 228.1)
-
Step 500
500
#0097C4
oklch(63.2% 0.123 228.1)
-
Step 600
600
#007FA5
oklch(55.7% 0.108 227.8)
-
Step 700
700
#006A8B
oklch(49% 0.096 228.3)
-
Step 800
800
#005773
oklch(42.7% 0.084 228.5)
-
Step 900
900
#004960
oklch(37.8% 0.073 227.3)
-
Step 950
950
#002B3B
oklch(27% 0.053 228.8)
#21BDF2 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) | #A1BAF5 | 0.100 |
| Deuteranopia (no green cones) | #87A7F1 | 0.087 |
| Tritanopia (no blue cones) | #00CCCF | 0.076 |
| Achromatopsia (no color) | #AFAFAF | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #21BDF2
#21BDF2
oklch(74.7% 0.14 228.1)
- #F38F59
#F38F59
oklch(74.6% 0.14 48)
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 #21BDF2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.018
- Bright Sky Blue #02CCFE ΔE 0.040
- Vivid Sky Blue #4CC9F0 ΔE 0.042
- Lightblue #7BC8F6 ΔE 0.068
- Turquoise Blue #06B1C4 ΔE 0.070
- Carolina Blue #8AB8FE ΔE 0.078
- Dark Turquoise #00CED1 ΔE 0.078
- Sky #82CAFC ΔE 0.078
Use #21BDF2 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.