#63B2E4
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.3% 0.107 238.3), rgb(99, 178, 228).
Aa
Black text reads best on this color (9.01:1).
About this color
#63B2E4 is a medium-light, moderately saturated blue. In OKLCH its lightness is 73%, its chroma 0.107 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.054 away. Black text reads best on it, at 9.01:1.
| Hue family | Blues |
| Lightness | medium-light (73%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.01:1 |
| White text | 2.32:1 |
Values
| HEX | #63B2E4 |
| RGB | rgb(99, 178, 228) |
| HSL | hsl(203, 70%, 64%) |
| OKLCH | oklch(73.3% 0.107 238.3) |
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 #63B2E4 | 2.32:1 | Fails | Lc -50.6 | Large or bold text, headings |
| Black text on #63B2E4 | 9.01:1 | AAA | Lc 58.2 | Large or bold text, headings |
| #63B2E4 text on white | 2.32:1 | Fails | Lc 45.7 | Large or bold text, headings |
| #63B2E4 text on black | 9.01:1 | AAA | Lc -56.3 | 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
#DFECF6
oklch(93.6% 0.019 240.7)
-
Step 200
200
#C4DDEF
oklch(88.5% 0.036 239.2)
-
Step 300
300
#99C7E7
oklch(80.8% 0.066 239)
-
Step 400
400 (this color)
#63B2E4
oklch(73.3% 0.107 238.3)
-
Step 500
500
#1493D2
oklch(63.1% 0.137 238.6)
-
Step 600
600
#007CB3
oklch(55.7% 0.124 238.2)
-
Step 700
700
#006897
oklch(49.1% 0.109 238.1)
-
Step 800
800
#00557D
oklch(42.7% 0.096 238.5)
-
Step 900
900
#004769
oklch(37.8% 0.084 238.3)
-
Step 950
950
#042A3F
oklch(27.1% 0.056 238.5)
#63B2E4 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) | #9BB1E6 | 0.061 |
| Deuteranopia (no green cones) | #89A4E3 | 0.051 |
| Tritanopia (no blue cones) | #00BFC3 | 0.082 |
| Achromatopsia (no color) | #AAAAAA | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B2E4
#63B2E4
oklch(73.3% 0.107 238.3)
- #DB9762
#DB9762
oklch(73.2% 0.107 58)
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 #63B2E4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.054
- Carolina Blue #8AB8FE ΔE 0.059
- Vivid Sky Blue #4CC9F0 ΔE 0.060
- Lightblue #7BC8F6 ΔE 0.068
- Turquoise Blue #06B1C4 ΔE 0.070
- Greyblue #77A1B5 ΔE 0.072
- Bright Sky Blue #02CCFE ΔE 0.073
- Light Grey Blue #9DBCD4 ΔE 0.075
Use #63B2E4 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.