#63BBCB
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(74.3% 0.088 210.8), rgb(99, 187, 203).
Aa
Black text reads best on this color (9.50:1).
About this color
#63BBCB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.088 and its hue 211°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.056 away. Black text reads best on it, at 9.50:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.50:1 |
| White text | 2.21:1 |
Values
| HEX | #63BBCB |
| RGB | rgb(99, 187, 203) |
| HSL | hsl(189, 50%, 59%) |
| OKLCH | oklch(74.3% 0.088 210.8) |
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 #63BBCB | 2.21:1 | Fails | Lc -48.1 | Large or bold text, headings |
| Black text on #63BBCB | 9.50:1 | AAA | Lc 60.6 | Content text, not long reading |
| #63BBCB text on white | 2.21:1 | Fails | Lc 43.3 | Non-text elements, placeholder text |
| #63BBCB text on black | 9.50:1 | AAA | Lc -58.8 | 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
#F0F7F8
oklch(97.1% 0.008 207.1)
-
Step 100
100
#DFEDF0
oklch(93.7% 0.015 212)
-
Step 200
200
#C3DFE4
oklch(88.5% 0.03 209.6)
-
Step 300
300
#98CBD5
oklch(81% 0.055 211)
-
Step 400
400 (this color)
#63BBCB
oklch(74.3% 0.088 210.8)
-
Step 500
500
#009BAF
oklch(63.2% 0.11 210.8)
-
Step 600
600
#008293
oklch(55.6% 0.096 210.7)
-
Step 700
700
#006D7C
oklch(49% 0.085 211.2)
-
Step 800
800
#005966
oklch(42.6% 0.074 211.8)
-
Step 900
900
#004B55
oklch(37.8% 0.065 210)
-
Step 950
950
#012C33
oklch(26.9% 0.046 211.3)
#63BBCB 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) | #ADB5CC | 0.082 |
| Deuteranopia (no green cones) | #9DA9CB | 0.076 |
| Tritanopia (no blue cones) | #1CC2C0 | 0.047 |
| Achromatopsia (no color) | #AEAEAE | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63BBCB
#63BBCB
oklch(74.3% 0.088 210.8)
- #DE978A
#DE978A
oklch(74.3% 0.088 30.7)
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 #63BBCB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.056
- Turquoise Blue #06B1C4 ΔE 0.057
- Dark Turquoise #00CED1 ΔE 0.059
- Medium Turquoise #48D1CC ΔE 0.062
- Topaz #13BBAF ΔE 0.063
- Light Cornflower Blue #98C1D9 ΔE 0.063
- Light Grey Blue #9DBCD4 ΔE 0.064
- Bluegrey #85A3B2 ΔE 0.069
Use #63BBCB 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.