#63B4EE
Closest named color: Deep Sky Blue (#00BFFF). oklch(74.2% 0.116 241.8), rgb(99, 180, 238).
Aa
Black text reads best on this color (9.29:1).
About this color
#63B4EE is a medium-light, moderately saturated blue. In OKLCH its lightness is 74%, its chroma 0.116 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.046 away. Black text reads best on it, at 9.29:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.29:1 |
| White text | 2.25:1 |
Values
| HEX | #63B4EE |
| RGB | rgb(99, 180, 238) |
| HSL | hsl(205, 80%, 66%) |
| OKLCH | oklch(74.2% 0.116 241.8) |
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 #63B4EE | 2.25:1 | Fails | Lc -49.2 | Large or bold text, headings |
| Black text on #63B4EE | 9.29:1 | AAA | Lc 59.6 | Large or bold text, headings |
| #63B4EE text on white | 2.25:1 | Fails | Lc 44.3 | Non-text elements, placeholder text |
| #63B4EE text on black | 9.29:1 | AAA | Lc -57.8 | 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
#F0F6FC
oklch(97% 0.01 247.9)
-
Step 100
100
#DEECF7
oklch(93.6% 0.021 241.4)
-
Step 200
200
#C3DDF2
oklch(88.5% 0.04 242.4)
-
Step 300
300
#97C7EC
oklch(80.9% 0.073 241.9)
-
Step 400
400 (this color)
#63B4EE
oklch(74.2% 0.116 241.8)
-
Step 500
500
#0592DA
oklch(63.2% 0.148 241.6)
-
Step 600
600
#007AB9
oklch(55.5% 0.132 242.1)
-
Step 700
700
#00679C
oklch(49.2% 0.116 241.5)
-
Step 800
800
#005481
oklch(42.7% 0.101 241.9)
-
Step 900
900
#00466C
oklch(37.7% 0.089 241.5)
-
Step 950
950
#022941
oklch(26.9% 0.061 241.6)
#63B4EE 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) | #9AB4F1 | 0.059 |
| Deuteranopia (no green cones) | #87A6ED | 0.049 |
| Tritanopia (no blue cones) | #00C2C8 | 0.089 |
| Achromatopsia (no color) | #ACACAC | 0.116 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B4EE
#63B4EE
oklch(74.2% 0.116 241.8)
- #E09A5A
#E09A5A
oklch(74.2% 0.116 61.9)
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 #63B4EE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.046
- Carolina Blue #8AB8FE ΔE 0.049
- Vivid Sky Blue #4CC9F0 ΔE 0.057
- Lightblue #7BC8F6 ΔE 0.061
- Bright Sky Blue #02CCFE ΔE 0.067
- Sky #82CAFC ΔE 0.070
- Light Cornflower Blue #98C1D9 ΔE 0.078
- Light Grey Blue #9DBCD4 ΔE 0.078
Use #63B4EE 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.