#63BDD5
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(75.2% 0.093 217.4), rgb(99, 189, 213).
Aa
Black text reads best on this color (9.77:1).
About this color
#63BDD5 is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 75%, its chroma 0.093 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.043 away. Black text reads best on it, at 9.77:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.77:1 |
| White text | 2.14:1 |
Values
| HEX | #63BDD5 |
| RGB | rgb(99, 189, 213) |
| HSL | hsl(193, 58%, 61%) |
| OKLCH | oklch(75.2% 0.093 217.4) |
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 #63BDD5 | 2.14:1 | Fails | Lc -46.7 | Large or bold text, headings |
| Black text on #63BDD5 | 9.77:1 | AAA | Lc 61.9 | Content text, not long reading |
| #63BDD5 text on white | 2.14:1 | Fails | Lc 42.0 | Non-text elements, placeholder text |
| #63BDD5 text on black | 9.77:1 | AAA | Lc -60.2 | 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
#F0F7F9
oklch(97.1% 0.008 216.6)
-
Step 100
100
#DEEDF1
oklch(93.6% 0.017 215.5)
-
Step 200
200
#C3DFE7
oklch(88.6% 0.032 216.8)
-
Step 300
300
#96CAD9
oklch(80.8% 0.058 217.5)
-
Step 400
400 (this color)
#63BDD5
oklch(75.2% 0.093 217.4)
-
Step 500
500
#0099B6
oklch(63% 0.113 217.6)
-
Step 600
600
#008199
oklch(55.6% 0.099 216.9)
-
Step 700
700
#006C81
oklch(49% 0.088 217.4)
-
Step 800
800
#00596A
oklch(42.8% 0.076 216.6)
-
Step 900
900
#004A59
oklch(37.7% 0.067 217.2)
-
Step 950
950
#002C36
oklch(27% 0.048 217.4)
#63BDD5 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) | #ADB8D6 | 0.081 |
| Deuteranopia (no green cones) | #9CABD5 | 0.074 |
| Tritanopia (no blue cones) | #00C6C4 | 0.057 |
| Achromatopsia (no color) | #B1B1B1 | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63BDD5
#63BDD5
oklch(75.2% 0.093 217.4)
- #E29A84
#E29A84
oklch(75.2% 0.093 37.7)
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 #63BDD5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.043
- Light Cornflower Blue #98C1D9 ΔE 0.057
- Lightblue #7BC8F6 ΔE 0.058
- Dark Turquoise #00CED1 ΔE 0.059
- Light Grey Blue #9DBCD4 ΔE 0.060
- Medium Turquoise #48D1CC ΔE 0.063
- Turquoise Blue #06B1C4 ΔE 0.064
- Sky Blue #87CEEB ΔE 0.065
Use #63BDD5 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.