#63B9FC
Closest named color: Carolina Blue (#8AB8FE). oklch(75.9% 0.128 244.2), rgb(99, 185, 252).
Aa
Black text reads best on this color (9.87:1).
About this color
#63B9FC is a medium-light, moderately saturated blue. In OKLCH its lightness is 76%, its chroma 0.128 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Carolina Blue (#8AB8FE), ΔE 0.038 away. Black text reads best on it, at 9.87:1.
| Hue family | Blues |
| Lightness | medium-light (76%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Carolina Blue (#8AB8FE) |
| Black text | 9.87:1 |
| White text | 2.12:1 |
Values
| HEX | #63B9FC |
| RGB | rgb(99, 185, 252) |
| HSL | hsl(206, 96%, 69%) |
| OKLCH | oklch(75.9% 0.128 244.2) |
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 #63B9FC | 2.12:1 | Fails | Lc -46.1 | Large or bold text, headings |
| Black text on #63B9FC | 9.87:1 | AAA | Lc 62.5 | Content text, not long reading |
| #63B9FC text on white | 2.12:1 | Fails | Lc 41.5 | Non-text elements, placeholder text |
| #63B9FC text on black | 9.87:1 | AAA | Lc -60.8 | 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
#B8DEFF
oklch(88.4% 0.061 244.8)
-
Step 300
300 (this color)
#63B9FC
oklch(75.9% 0.128 244.2)
-
Step 400
400
#23A9FF
oklch(70.8% 0.165 244)
-
Step 500
500
#0090E0
oklch(63% 0.157 244.4)
-
Step 600
600
#0079BD
oklch(55.5% 0.138 244.2)
-
Step 700
700
#0066A0
oklch(49.2% 0.121 244)
-
Step 800
800
#005384
oklch(42.6% 0.106 244.3)
-
Step 900
900
#00456F
oklch(37.6% 0.093 244.3)
-
Step 950
950
#002944
oklch(27% 0.066 243.6)
#63B9FC 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) | #9CBAFF | 0.060 |
| Deuteranopia (no green cones) | #87ABFB | 0.047 |
| Tritanopia (no blue cones) | #00C9D0 | 0.098 |
| Achromatopsia (no color) | #B2B2B2 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B9FC
#63B9FC
oklch(75.9% 0.128 244.2)
- #E99E52
#E99E52
oklch(75.9% 0.128 64)
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 #63B9FC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Carolina Blue #8AB8FE ΔE 0.038
- Deep Sky Blue #00BFFF ΔE 0.040
- Lightblue #7BC8F6 ΔE 0.052
- Vivid Sky Blue #4CC9F0 ΔE 0.053
- Sky #82CAFC ΔE 0.058
- Bright Sky Blue #02CCFE ΔE 0.058
- Pastel Blue #A2BFFE ΔE 0.070
- Light Sky Blue #87CEFA ΔE 0.071
Use #63B9FC 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.