#638BE2
Closest named color: Soft Blue (#6488EA). oklch(64.7% 0.138 264.2), rgb(99, 139, 226).
Aa
Black text reads best on this color (6.32:1).
About this color
#638BE2 is a medium-light, moderately saturated blue. In OKLCH its lightness is 65%, its chroma 0.138 and its hue 264°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.016 away. Black text reads best on it, at 6.32:1.
| Hue family | Blues |
| Lightness | medium-light (65%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 6.32:1 |
| White text | 3.32:1 |
Values
| HEX | #638BE2 |
| RGB | rgb(99, 139, 226) |
| HSL | hsl(221, 69%, 64%) |
| OKLCH | oklch(64.7% 0.138 264.2) |
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 #638BE2 | 3.32:1 | AA large text | Lc -65.9 | Content text, not long reading |
| Black text on #638BE2 | 6.32:1 | AA | Lc 43.6 | Non-text elements, placeholder text |
| #638BE2 text on white | 3.32:1 | AA large text | Lc 60.4 | Content text, not long reading |
| #638BE2 text on black | 6.32:1 | AA | Lc -41.3 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CDD9F3
oklch(88.4% 0.038 265.8)
-
Step 300
300
#ABC1ED
oklch(80.9% 0.067 264.1)
-
Step 400
400
#7E9FE4
oklch(70.6% 0.108 264.2)
-
Step 500
500 (this color)
#638BE2
oklch(64.7% 0.138 264.2)
-
Step 600
600
#456ECA
oklch(55.6% 0.15 264.1)
-
Step 700
700
#375BAF
oklch(49% 0.14 264.4)
-
Step 800
800
#2E4B8E
oklch(42.7% 0.116 264.4)
-
Step 900
900
#293F71
oklch(37.7% 0.09 264.6)
-
Step 950
950
#182542
oklch(26.9% 0.057 264.6)
#638BE2 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) | #6793E5 | 0.022 |
| Deuteranopia (no green cones) | #5788E0 | 0.016 |
| Tritanopia (no blue cones) | #039EAC | 0.123 |
| Achromatopsia (no color) | #8D8D8D | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638BE2
#638BE2
oklch(64.7% 0.138 264.2)
- #B48600
#B48600
oklch(64.7% 0.133 84.2)
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 #638BE2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.016
- Dark Sky Blue #448EE4 ΔE 0.029
- Cornflower Blue #6495ED ΔE 0.029
- Chefchaouen Blue #4895EF ΔE 0.035
- Perrywinkle #8F8CE7 ΔE 0.057
- Cornflower #6A79F7 ΔE 0.060
- Faded Blue #658CBB ΔE 0.060
- Dodger Blue #1E90FF ΔE 0.061
Use #638BE2 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.