#63BFCF
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75.4% 0.09 210.2), rgb(99, 191, 207).
Aa
Black text reads best on this color (9.88:1).
About this color
#63BFCF is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.090 and its hue 210°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.048 away. Black text reads best on it, at 9.88:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.88:1 |
| White text | 2.12:1 |
Values
| HEX | #63BFCF |
| RGB | rgb(99, 191, 207) |
| HSL | hsl(189, 53%, 60%) |
| OKLCH | oklch(75.4% 0.09 210.2) |
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 #63BFCF | 2.12:1 | Fails | Lc -46.1 | Large or bold text, headings |
| Black text on #63BFCF | 9.88:1 | AAA | Lc 62.5 | Content text, not long reading |
| #63BFCF text on white | 2.12:1 | Fails | Lc 41.5 | Non-text elements, placeholder text |
| #63BFCF text on black | 9.88:1 | AAA | Lc -60.8 | 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
#F0F7F8
oklch(97.1% 0.008 207.1)
-
Step 100
100
#DEEDF0
oklch(93.6% 0.016 211)
-
Step 200
200
#C2DFE5
oklch(88.4% 0.032 211.6)
-
Step 300
300
#96CBD5
oklch(80.9% 0.057 210.5)
-
Step 400
400 (this color)
#63BFCF
oklch(75.4% 0.09 210.2)
-
Step 500
500
#009BAE
oklch(63.2% 0.109 210)
-
Step 600
600
#008292
oklch(55.6% 0.096 209.8)
-
Step 700
700
#006D7B
oklch(49% 0.085 210.2)
-
Step 800
800
#005A65
oklch(42.8% 0.074 209.1)
-
Step 900
900
#004B55
oklch(37.8% 0.065 210)
-
Step 950
950
#002C33
oklch(26.9% 0.047 211.1)
#63BFCF 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) | #B1B9D0 | 0.086 |
| Deuteranopia (no green cones) | #A0ACCF | 0.079 |
| Tritanopia (no blue cones) | #10C6C4 | 0.048 |
| Achromatopsia (no color) | #B2B2B2 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63BFCF
#63BFCF
oklch(75.4% 0.09 210.2)
- #E39A8D
#E39A8D
oklch(75.5% 0.09 30.5)
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 #63BFCF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.048
- Dark Turquoise #00CED1 ΔE 0.052
- Medium Turquoise #48D1CC ΔE 0.053
- Light Cornflower Blue #98C1D9 ΔE 0.058
- Light Grey Blue #9DBCD4 ΔE 0.061
- Lightblue #7BC8F6 ΔE 0.064
- Turquoise Blue #06B1C4 ΔE 0.065
- Sky Blue #87CEEB ΔE 0.066
Use #63BFCF 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.