#63B9DB
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(74.5% 0.096 226.1), rgb(99, 185, 219).
Aa
Black text reads best on this color (9.49:1).
About this color
#63B9DB is a medium-light, moderately saturated teal or cyan. In OKLCH its lightness is 74%, its chroma 0.096 and its hue 226°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.046 away. Black text reads best on it, at 9.49:1.
| Hue family | Teals and cyans |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 9.49:1 |
| White text | 2.21:1 |
Values
| HEX | #63B9DB |
| RGB | rgb(99, 185, 219) |
| HSL | hsl(197, 62%, 62%) |
| OKLCH | oklch(74.5% 0.096 226.1) |
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 #63B9DB | 2.21:1 | Fails | Lc -48.1 | Large or bold text, headings |
| Black text on #63B9DB | 9.49:1 | AAA | Lc 60.6 | Content text, not long reading |
| #63B9DB text on white | 2.21:1 | Fails | Lc 43.4 | Non-text elements, placeholder text |
| #63B9DB text on black | 9.49:1 | 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
#F0F7FA
oklch(97.2% 0.008 225.1)
-
Step 100
100
#DEEDF3
oklch(93.7% 0.018 223.6)
-
Step 200
200
#C3DEEA
oklch(88.4% 0.033 226.4)
-
Step 300
300
#97C9DF
oklch(80.8% 0.061 226.8)
-
Step 400
400 (this color)
#63B9DB
oklch(74.5% 0.096 226.1)
-
Step 500
500
#0097C1
oklch(63% 0.121 226.4)
-
Step 600
600
#007FA3
oklch(55.6% 0.107 226.4)
-
Step 700
700
#006B89
oklch(49.1% 0.094 225.7)
-
Step 800
800
#005771
oklch(42.6% 0.082 226.6)
-
Step 900
900
#00495F
oklch(37.8% 0.072 226.2)
-
Step 950
950
#012B39
oklch(26.9% 0.051 225.9)
#63B9DB 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) | #A7B6DD | 0.074 |
| Deuteranopia (no green cones) | #95A9DB | 0.064 |
| Tritanopia (no blue cones) | #00C3C4 | 0.066 |
| Achromatopsia (no color) | #AEAEAE | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B9DB
#63B9DB
oklch(74.5% 0.096 226.1)
- #DF9978
#DF9978
oklch(74.4% 0.096 46)
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 #63B9DB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.046
- Lightblue #7BC8F6 ΔE 0.058
- Deep Sky Blue #00BFFF ΔE 0.059
- Light Cornflower Blue #98C1D9 ΔE 0.061
- Light Grey Blue #9DBCD4 ΔE 0.063
- Turquoise Blue #06B1C4 ΔE 0.063
- Bright Sky Blue #02CCFE ΔE 0.065
- Carolina Blue #8AB8FE ΔE 0.068
Use #63B9DB 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.