#63A8DF
Closest named color: Cornflower Blue (#6495ED). oklch(70.8% 0.107 244.2), rgb(99, 168, 223).
Aa
Black text reads best on this color (8.19:1).
About this color
#63A8DF is a medium-light, moderately saturated blue. In OKLCH its lightness is 71%, its chroma 0.107 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.060 away. Black text reads best on it, at 8.19:1.
| Hue family | Blues |
| Lightness | medium-light (71%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 8.19:1 |
| White text | 2.56:1 |
Values
| HEX | #63A8DF |
| RGB | rgb(99, 168, 223) |
| HSL | hsl(207, 66%, 63%) |
| OKLCH | oklch(70.8% 0.107 244.2) |
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 #63A8DF | 2.56:1 | Fails | Lc -55.1 | Large or bold text, headings |
| Black text on #63A8DF | 8.19:1 | AAA | Lc 54.0 | Large or bold text, headings |
| #63A8DF text on white | 2.56:1 | Fails | Lc 50.0 | Large or bold text, headings |
| #63A8DF text on black | 8.19:1 | AAA | Lc -52.0 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C5DCF0
oklch(88.4% 0.037 244.4)
-
Step 300
300
#9CC6E9
oklch(80.9% 0.067 243.9)
-
Step 400
400 (this color)
#63A8DF
oklch(70.8% 0.107 244.2)
-
Step 500
500
#2E90D6
oklch(63% 0.137 244.6)
-
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
#07456D
oklch(37.7% 0.089 244.4)
-
Step 950
950
#092940
oklch(27.1% 0.056 244.1)
#63A8DF 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) | #90A9E2 | 0.051 |
| Deuteranopia (no green cones) | #809CDE | 0.042 |
| Tritanopia (no blue cones) | #00B5BB | 0.088 |
| Achromatopsia (no color) | #A2A2A2 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63A8DF
#63A8DF
oklch(70.8% 0.107 244.2)
- #CF9256
#CF9256
oklch(70.8% 0.106 64.2)
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 #63A8DF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.060
- Greyblue #77A1B5 ΔE 0.061
- Chefchaouen Blue #4895EF ΔE 0.069
- Bluegrey #85A3B2 ΔE 0.070
- Turquoise Blue #06B1C4 ΔE 0.072
- Deep Sky Blue #00BFFF ΔE 0.072
- Bluey Grey #89A0B0 ΔE 0.074
- Carolina Blue #8AB8FE ΔE 0.074
Use #63A8DF 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.