#638FFD
Closest named color: Soft Blue (#6488EA). oklch(67.1% 0.17 265.6), rgb(99, 143, 253).
Aa
Black text reads best on this color (6.87:1).
About this color
#638FFD is a medium-light, vivid blue. In OKLCH its lightness is 67%, its chroma 0.170 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.031 away. Black text reads best on it, at 6.87:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | vivid (0.170) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 6.87:1 |
| White text | 3.05:1 |
Values
| HEX | #638FFD |
| RGB | rgb(99, 143, 253) |
| HSL | hsl(223, 97%, 69%) |
| OKLCH | oklch(67.1% 0.17 265.6) |
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 #638FFD | 3.05:1 | AA large text | Lc -62.5 | Content text, not long reading |
| Black text on #638FFD | 6.87:1 | AA | Lc 46.9 | Large or bold text, headings |
| #638FFD text on white | 3.05:1 | AA large text | Lc 57.1 | Large or bold text, headings |
| #638FFD text on black | 6.87:1 | AA | Lc -44.7 | Non-text elements, placeholder text |
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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E0EAFF
oklch(93.6% 0.03 265.3)
-
Step 200
200
#C8D9FF
oklch(88.5% 0.056 266.2)
-
Step 300
300
#A3C0FF
oklch(80.9% 0.095 265.2)
-
Step 400
400 (this color)
#638FFD
oklch(67.1% 0.17 265.6)
-
Step 500
500
#4F7FFF
oklch(63.1% 0.197 265.6)
-
Step 600
600
#3060FA
oklch(55.7% 0.235 265.6)
-
Step 700
700
#244DDA
oklch(49% 0.219 265.6)
-
Step 800
800
#1E41B0
oklch(42.7% 0.181 265.5)
-
Step 900
900
#1D398B
oklch(37.7% 0.141 265.6)
-
Step 950
950
#112252
oklch(27% 0.091 265.8)
#638FFD 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) | #5C9BFF | 0.030 |
| Deuteranopia (no green cones) | #448DFB | 0.030 |
| Tritanopia (no blue cones) | #00A8BA | 0.145 |
| Achromatopsia (no color) | #939393 | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638FFD
#638FFD
oklch(67.1% 0.17 265.6)
- #BB8E00
#BB8E00
oklch(67.1% 0.137 86)
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 #638FFD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.031
- Cornflower Blue #6495ED ΔE 0.031
- Chefchaouen Blue #4895EF ΔE 0.037
- Dodger Blue #1E90FF ΔE 0.048
- Dark Sky Blue #448EE4 ΔE 0.049
- Lavender Blue #8B88F8 ΔE 0.050
- Cornflower #6A79F7 ΔE 0.054
- Periwinkle #8E82FE ΔE 0.059
Use #638FFD 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.