#638EE8
Closest named color: Soft Blue (#6488EA). oklch(65.7% 0.143 263.6), rgb(99, 142, 232).
Aa
Black text reads best on this color (6.56:1).
About this color
#638EE8 is a medium-light, vivid blue. In OKLCH its lightness is 66%, its chroma 0.143 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.017 away. Black text reads best on it, at 6.56:1.
| Hue family | Blues |
| Lightness | medium-light (66%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 6.56:1 |
| White text | 3.19:1 |
Values
| HEX | #638EE8 |
| RGB | rgb(99, 142, 232) |
| HSL | hsl(221, 74%, 65%) |
| OKLCH | oklch(65.7% 0.143 263.6) |
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 #638EE8 | 3.19:1 | AA large text | Lc -64.4 | Content text, not long reading |
| Black text on #638EE8 | 6.56:1 | AA | Lc 45.1 | Large or bold text, headings |
| #638EE8 text on white | 3.19:1 | AA large text | Lc 59.0 | Large or bold text, headings |
| #638EE8 text on black | 6.56:1 | AA | Lc -42.7 | 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 500.
-
Step 50
50
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF4
oklch(88.6% 0.039 262.9)
-
Step 300
300
#AAC1EF
oklch(81% 0.07 264.1)
-
Step 400
400
#7CA0E7
oklch(70.8% 0.112 263.2)
-
Step 500
500 (this color)
#638EE8
oklch(65.7% 0.143 263.6)
-
Step 600
600
#426ECD
oklch(55.6% 0.155 263.5)
-
Step 700
700
#345BB1
oklch(49% 0.144 263.6)
-
Step 800
800
#2C4B90
oklch(42.8% 0.12 263.9)
-
Step 900
900
#273F73
oklch(37.7% 0.094 263.8)
-
Step 950
950
#172543
oklch(26.9% 0.059 264)
#638EE8 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) | #6896EC | 0.023 |
| Deuteranopia (no green cones) | #578AE6 | 0.018 |
| Tritanopia (no blue cones) | #00A2B0 | 0.126 |
| Achromatopsia (no color) | #909090 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638EE8
#638EE8
oklch(65.7% 0.143 263.6)
- #B88800
#B88800
oklch(65.6% 0.135 83.5)
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 #638EE8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.017
- Cornflower Blue #6495ED ΔE 0.019
- Chefchaouen Blue #4895EF ΔE 0.028
- Dark Sky Blue #448EE4 ΔE 0.030
- Perrywinkle #8F8CE7 ΔE 0.055
- Dodger Blue #1E90FF ΔE 0.056
- Lavender Blue #8B88F8 ΔE 0.058
- Cornflower #6A79F7 ΔE 0.061
Use #638EE8 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.