#63A1EF
Closest named color: Cornflower Blue (#6495ED). oklch(70.1% 0.132 254.9), rgb(99, 161, 239).
Aa
Black text reads best on this color (7.87:1).
About this color
#63A1EF is a medium-light, moderately saturated blue. In OKLCH its lightness is 70%, its chroma 0.132 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower Blue (#6495ED), ΔE 0.032 away. Black text reads best on it, at 7.87:1.
| Hue family | Blues |
| Lightness | medium-light (70%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Cornflower Blue (#6495ED) |
| Black text | 7.87:1 |
| White text | 2.66:1 |
Values
| HEX | #63A1EF |
| RGB | rgb(99, 161, 239) |
| HSL | hsl(213, 81%, 66%) |
| OKLCH | oklch(70.1% 0.132 254.9) |
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 #63A1EF | 2.66:1 | Fails | Lc -56.8 | Large or bold text, headings |
| Black text on #63A1EF | 7.87:1 | AAA | Lc 52.4 | Large or bold text, headings |
| #63A1EF text on white | 2.66:1 | Fails | Lc 51.7 | Large or bold text, headings |
| #63A1EF text on black | 7.87:1 | AAA | Lc -50.2 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#DFEBFA
oklch(93.6% 0.024 254)
-
Step 200
200
#C5DBF8
oklch(88.4% 0.047 255.4)
-
Step 300
300
#9DC4F6
oklch(81% 0.083 254.9)
-
Step 400
400 (this color)
#63A1EF
oklch(70.1% 0.132 254.9)
-
Step 500
500
#3689EC
oklch(63% 0.169 255.1)
-
Step 600
600
#0071DA
oklch(55.6% 0.182 254.8)
-
Step 700
700
#005FB9
oklch(49.2% 0.161 254.8)
-
Step 800
800
#004D99
oklch(42.7% 0.14 255)
-
Step 900
900
#0E417A
oklch(37.7% 0.11 254.8)
-
Step 950
950
#0B2747
oklch(27.1% 0.068 254.1)
#63A1EF 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) | #80A6F2 | 0.036 |
| Deuteranopia (no green cones) | #6E98ED | 0.024 |
| Tritanopia (no blue cones) | #00B3BD | 0.113 |
| Achromatopsia (no color) | #9E9E9E | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #63A1EF
#63A1EF
oklch(70.1% 0.132 254.9)
- #CE912D
#CE912D
oklch(70% 0.132 74.9)
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 #63A1EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower Blue #6495ED ΔE 0.032
- Chefchaouen Blue #4895EF ΔE 0.043
- Periwinkle Blue #8F99FB ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.063
- Soft Blue #6488EA ΔE 0.065
- Perrywinkle #8F8CE7 ΔE 0.069
- Dodger Blue #1E90FF ΔE 0.076
- Lavender Blue #8B88F8 ΔE 0.078
Use #63A1EF 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.