#63B1EF
Closest named color: Deep Sky Blue (#00BFFF). oklch(73.6% 0.119 244.4), rgb(99, 177, 239).
Aa
Black text reads best on this color (9.06:1).
About this color
#63B1EF is a medium-light, moderately saturated blue. In OKLCH its lightness is 74%, its chroma 0.119 and its hue 244°. Its hue sits on the cool side of the wheel. The nearest named color is Deep Sky Blue (#00BFFF), ΔE 0.050 away. Black text reads best on it, at 9.06:1.
| Hue family | Blues |
| Lightness | medium-light (74%) |
| Chroma | moderately saturated (0.119) |
| Temperature | cool |
| Nearest name | Deep Sky Blue (#00BFFF) |
| Black text | 9.06:1 |
| White text | 2.31:1 |
Values
| HEX | #63B1EF |
| RGB | rgb(99, 177, 239) |
| HSL | hsl(207, 81%, 66%) |
| OKLCH | oklch(73.6% 0.119 244.4) |
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 #63B1EF | 2.31:1 | Fails | Lc -50.4 | Large or bold text, headings |
| Black text on #63B1EF | 9.06:1 | AAA | Lc 58.5 | Large or bold text, headings |
| #63B1EF text on white | 2.31:1 | Fails | Lc 45.5 | Large or bold text, headings |
| #63B1EF text on black | 9.06:1 | AAA | Lc -56.6 | 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
#DEECF8
oklch(93.6% 0.022 243.8)
-
Step 200
200
#C3DDF3
oklch(88.5% 0.041 243.7)
-
Step 300
300
#98C6EE
oklch(80.8% 0.075 245.2)
-
Step 400
400 (this color)
#63B1EF
oklch(73.6% 0.119 244.4)
-
Step 500
500
#1490DE
oklch(63% 0.152 244.6)
-
Step 600
600
#0079BE
oklch(55.6% 0.139 244.6)
-
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
#042943
oklch(27.1% 0.063 244.6)
#63B1EF 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) | #96B2F2 | 0.055 |
| Deuteranopia (no green cones) | #83A4EE | 0.044 |
| Tritanopia (no blue cones) | #00C0C6 | 0.095 |
| Achromatopsia (no color) | #AAAAAA | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63B1EF
#63B1EF
oklch(73.6% 0.119 244.4)
- #DD9953
#DD9953
oklch(73.6% 0.119 64.9)
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 #63B1EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Deep Sky Blue #00BFFF ΔE 0.050
- Carolina Blue #8AB8FE ΔE 0.051
- Vivid Sky Blue #4CC9F0 ΔE 0.065
- Lightblue #7BC8F6 ΔE 0.069
- Bright Sky Blue #02CCFE ΔE 0.074
- Cornflower Blue #6495ED ΔE 0.075
- Sky #82CAFC ΔE 0.077
- Periwinkle Blue #8F99FB ΔE 0.081
Use #63B1EF 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.