#00CBF4
Closest named color: Bright Sky Blue (#02CCFE). oklch(77.8% 0.141 219.4), rgb(0, 203, 244).
Aa
Black text reads best on this color (10.84:1).
About this color
#00CBF4 is a medium-light, vivid teal or cyan. In OKLCH its lightness is 78%, its chroma 0.141 and its hue 219°. Its hue sits on the cool side of the wheel. The nearest named color is Bright Sky Blue (#02CCFE), ΔE 0.014 away. Black text reads best on it, at 10.84:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (78%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Bright Sky Blue (#02CCFE) |
| Black text | 10.84:1 |
| White text | 1.93:1 |
Values
| HEX | #00CBF4 |
| RGB | rgb(0, 203, 244) |
| HSL | hsl(190, 100%, 48%) |
| OKLCH | oklch(77.8% 0.141 219.4) |
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 #00CBF4 | 1.93:1 | Fails | Lc -40.7 | Non-text elements, placeholder text |
| Black text on #00CBF4 | 10.84:1 | AAA | Lc 67.5 | Content text, not long reading |
| #00CBF4 text on white | 1.93:1 | Fails | Lc 36.4 | Non-text elements, placeholder text |
| #00CBF4 text on black | 10.84:1 | AAA | Lc -66.1 | 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 300.
-
Step 50
50
#E8F9FE
oklch(97.1% 0.019 217.2)
-
Step 100
100
#CDF1FD
oklch(93.6% 0.041 219.9)
-
Step 200
200
#9DE6FD
oklch(88.5% 0.079 219.6)
-
Step 300
300 (this color)
#00CBF4
oklch(77.8% 0.141 219.4)
-
Step 400
400
#00B2D7
oklch(70.6% 0.128 219.8)
-
Step 500
500
#0099B8
oklch(63.1% 0.114 219)
-
Step 600
600
#00809B
oklch(55.5% 0.101 219.5)
-
Step 700
700
#006C83
oklch(49.1% 0.089 219.3)
-
Step 800
800
#00586C
oklch(42.6% 0.078 220.2)
-
Step 900
900
#004A5A
oklch(37.8% 0.068 218.5)
-
Step 950
950
#002C37
oklch(27.1% 0.049 219.4)
#00CBF4 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) | #B2C5F6 | 0.118 |
| Deuteranopia (no green cones) | #97B2F4 | 0.105 |
| Tritanopia (no blue cones) | #00D8D8 | 0.063 |
| Achromatopsia (no color) | #BABABA | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #00CBF4
#00CBF4
oklch(77.8% 0.141 219.4)
- #FF9774
#FF9774
oklch(77.8% 0.134 39.3)
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 #00CBF4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Bright Sky Blue #02CCFE ΔE 0.014
- Vivid Sky Blue #4CC9F0 ΔE 0.021
- Deep Sky Blue #00BFFF ΔE 0.041
- Aqua Blue #02D8E9 ΔE 0.044
- Dark Turquoise #00CED1 ΔE 0.055
- Lightblue #7BC8F6 ΔE 0.058
- Sky #82CAFC ΔE 0.067
- Medium Turquoise #48D1CC ΔE 0.067
Use #00CBF4 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.