#63B9FA
Closest named color: Carolina Blue (#8AB8FE). oklch(75.8% 0.126 243.4), rgb(99, 185, 250).
Aa
Black text reads best on this color (9.85:1).
About this color
#63B9FA is a medium-light, moderately saturated blue. In OKLCH its lightness is 76%, its chroma 0.126 and its hue 243°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.039 away. Black text reads best on it, at 9.85:1.
| Hue family | Blues |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 9.85:1 |
| White text | 2.13:1 |
Values
| HEX | #63B9FA |
| RGB | rgb(99, 185, 250) |
| HSL | hsl(206, 94%, 68%) |
| OKLCH | oklch(75.8% 0.126 243.4) |
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 #63B9FA | 2.13:1 | Fails | Lc -46.2 | Large or bold text, headings |
| Black text on #63B9FA | 9.85:1 | AAA | Lc 62.3 | Content text, not long reading |
| #63B9FA text on white | 2.13:1 | Fails | Lc 41.6 | Non-text elements, placeholder text |
| #63B9FA text on black | 9.85:1 | AAA | Lc -60.6 | 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
#D8EDFF
oklch(93.6% 0.033 244)
-
Step 200
200
#B7DFFF
oklch(88.6% 0.061 242.5)
-
Step 300
300 (this color)
#63B9FA
oklch(75.8% 0.126 243.4)
-
Step 400
400
#1AA9FF
oklch(70.7% 0.166 243.4)
-
Step 500
500
#0091DE
oklch(63.1% 0.153 243.2)
-
Step 600
600
#007ABC
oklch(55.7% 0.136 243.3)
-
Step 700
700
#00669F
oklch(49.1% 0.12 243.6)
-
Step 800
800
#005383
oklch(42.6% 0.105 243.8)
-
Step 900
900
#00456E
oklch(37.6% 0.092 243.7)
-
Step 950
950
#002944
oklch(27% 0.066 243.6)
#63B9FA 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) | #9CBAFD | 0.060 |
| Deuteranopia (no green cones) | #88ABF9 | 0.048 |
| Tritanopia (no blue cones) | #00C9CF | 0.097 |
| Achromatopsia (no color) | #B2B2B2 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B9FA
#63B9FA
oklch(75.8% 0.126 243.4)
- #E89E55
#E89E55
oklch(75.8% 0.125 63.5)
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 #63B9FA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.039
- Deep Sky Blue #00BFFF ΔE 0.040
- Lightblue #7BC8F6 ΔE 0.051
- Vivid Sky Blue #4CC9F0 ΔE 0.051
- Bright Sky Blue #02CCFE ΔE 0.057
- Sky #82CAFC ΔE 0.058
- Pastel Blue #A2BFFE ΔE 0.070
- Light Sky Blue #87CEFA ΔE 0.071
Use #63B9FA 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.