#63BBF6
Closest named color: Deep Sky Blue (#00BFFF). oklch(76.1% 0.12 240.2), rgb(99, 187, 246).
Aa
Black text reads best on this color (9.96:1).
About this color
#63BBF6 is a medium-light, moderately saturated blue. In OKLCH its lightness is 76%, its chroma 0.120 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.039 away. Black text reads best on it, at 9.96:1.
| Hue family | Blues |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.96:1 |
| White text | 2.10:1 |
Values
| HEX | #63BBF6 |
| RGB | rgb(99, 187, 246) |
| HSL | hsl(204, 89%, 68%) |
| OKLCH | oklch(76.1% 0.12 240.2) |
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 #63BBF6 | 2.10:1 | Fails | Lc -45.6 | Large or bold text, headings |
| Black text on #63BBF6 | 9.96:1 | AAA | Lc 62.9 | Content text, not long reading |
| #63BBF6 text on white | 2.10:1 | Fails | Lc 41.0 | Non-text elements, placeholder text |
| #63BBF6 text on black | 9.96:1 | AAA | Lc -61.2 | 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 300.
-
Step 50
50
#EDF7FF
oklch(97.1% 0.015 241.8)
-
Step 100
100
#D6EEFF
oklch(93.7% 0.034 238.7)
-
Step 200
200
#B4DFFF
oklch(88.4% 0.063 240.6)
-
Step 300
300 (this color)
#63BBF6
oklch(76.1% 0.12 240.2)
-
Step 400
400
#00ABFB
oklch(70.7% 0.163 240.3)
-
Step 500
500
#0092D8
oklch(63% 0.146 240.6)
-
Step 600
600
#007BB6
oklch(55.6% 0.128 240.2)
-
Step 700
700
#00679A
oklch(49.1% 0.113 240.5)
-
Step 800
800
#00547F
oklch(42.6% 0.099 240.7)
-
Step 900
900
#00466B
oklch(37.7% 0.087 240.8)
-
Step 950
950
#002A41
oklch(27.1% 0.061 239)
#63BBF6 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) | #A0BBF9 | 0.064 |
| Deuteranopia (no green cones) | #8CACF5 | 0.053 |
| Tritanopia (no blue cones) | #00CACF | 0.090 |
| Achromatopsia (no color) | #B3B3B3 | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63BBF6
#63BBF6
oklch(76.1% 0.12 240.2)
- #E99E5E
#E99E5E
oklch(76% 0.12 60)
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 #63BBF6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.039
- Carolina Blue #8AB8FE ΔE 0.041
- Vivid Sky Blue #4CC9F0 ΔE 0.043
- Lightblue #7BC8F6 ΔE 0.044
- Bright Sky Blue #02CCFE ΔE 0.052
- Sky #82CAFC ΔE 0.053
- Light Sky Blue #87CEFA ΔE 0.065
- Pastel Blue #A2BFFE ΔE 0.069
Use #63BBF6 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.