#63B7EB
Closest named color: Deep Sky Blue (#00BFFF). oklch(74.7% 0.111 237.9), rgb(99, 183, 235).
Aa
Black text reads best on this color (9.50:1).
About this color
#63B7EB is a medium-light, moderately saturated blue. In OKLCH its lightness is 75%, its chroma 0.111 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.045 away. Black text reads best on it, at 9.50:1.
| Hue family | Blues |
| Lightness | medium-light (75%) |
| Chroma | moderately saturated (0.111) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.50:1 |
| White text | 2.20:1 |
Values
| HEX | #63B7EB |
| RGB | rgb(99, 183, 235) |
| HSL | hsl(203, 77%, 65%) |
| OKLCH | oklch(74.7% 0.111 237.9) |
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 #63B7EB | 2.20:1 | Fails | Lc -48.1 | Large or bold text, headings |
| Black text on #63B7EB | 9.50:1 | AAA | Lc 60.6 | Content text, not long reading |
| #63B7EB text on white | 2.20:1 | Fails | Lc 43.3 | Non-text elements, placeholder text |
| #63B7EB text on black | 9.50:1 | AAA | Lc -58.9 | 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
#F0F6FB
oklch(97% 0.009 242.8)
-
Step 100
100
#DEECF6
oklch(93.6% 0.02 238.7)
-
Step 200
200
#C2DDF0
oklch(88.4% 0.039 238.6)
-
Step 300
300
#97C8E9
oklch(81% 0.069 238.2)
-
Step 400
400 (this color)
#63B7EB
oklch(74.7% 0.111 237.9)
-
Step 500
500
#0093D3
oklch(63% 0.14 238.1)
-
Step 600
600
#007CB2
oklch(55.6% 0.123 237.7)
-
Step 700
700
#006897
oklch(49.1% 0.109 238.1)
-
Step 800
800
#00557C
oklch(42.7% 0.094 237.9)
-
Step 900
900
#004768
oklch(37.7% 0.083 237.5)
-
Step 950
950
#012A3F
oklch(27% 0.058 237)
#63B7EB 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) | #9FB6ED | 0.064 |
| Deuteranopia (no green cones) | #8CA8EA | 0.054 |
| Tritanopia (no blue cones) | #00C4C8 | 0.084 |
| Achromatopsia (no color) | #AEAEAE | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B7EB
#63B7EB
oklch(74.7% 0.111 237.9)
- #E29B64
#E29B64
oklch(74.8% 0.111 57.8)
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 #63B7EB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.045
- Vivid Sky Blue #4CC9F0 ΔE 0.048
- Carolina Blue #8AB8FE ΔE 0.050
- Lightblue #7BC8F6 ΔE 0.054
- Bright Sky Blue #02CCFE ΔE 0.061
- Sky #82CAFC ΔE 0.064
- Light Cornflower Blue #98C1D9 ΔE 0.070
- Light Grey Blue #9DBCD4 ΔE 0.071
Use #63B7EB 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.