#638BDB
Closest named color: Soft Blue (#6488EA). oklch(64.3% 0.129 263.1), rgb(99, 139, 219).
Aa
Black text reads best on this color (6.24:1).
About this color
#638BDB is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.129 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.026 away. Black text reads best on it, at 6.24:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 6.24:1 |
| White text | 3.36:1 |
Values
| HEX | #638BDB |
| RGB | rgb(99, 139, 219) |
| HSL | hsl(220, 62%, 62%) |
| OKLCH | oklch(64.3% 0.129 263.1) |
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 #638BDB | 3.36:1 | AA large text | Lc -66.4 | Content text, not long reading |
| Black text on #638BDB | 6.24:1 | AA | Lc 43.2 | Non-text elements, placeholder text |
| #638BDB text on white | 3.36:1 | AA large text | Lc 60.9 | Content text, not long reading |
| #638BDB text on black | 6.24:1 | AA | Lc -40.8 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EAF6
oklch(93.5% 0.018 261.3)
-
Step 200
200
#CDDAF1
oklch(88.6% 0.035 262)
-
Step 300
300
#ABC1EA
oklch(80.8% 0.063 262.8)
-
Step 400
400
#7FA0E0
oklch(70.6% 0.101 263.1)
-
Step 500
500 (this color)
#638BDB
oklch(64.3% 0.129 263.1)
-
Step 600
600
#4670C4
oklch(55.7% 0.139 262.7)
-
Step 700
700
#385DAA
oklch(49.2% 0.13 263.1)
-
Step 800
800
#2F4C89
oklch(42.6% 0.107 263.4)
-
Step 900
900
#29406E
oklch(37.7% 0.084 262.9)
-
Step 950
950
#182640
oklch(27% 0.052 262)
#638BDB 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) | #6B92DE | 0.022 |
| Deuteranopia (no green cones) | #5C87D9 | 0.014 |
| Tritanopia (no blue cones) | #1A9DA9 | 0.115 |
| Achromatopsia (no color) | #8C8C8C | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638BDB
#638BDB
oklch(64.3% 0.129 263.1)
- #B38510
#B38510
oklch(64.5% 0.129 83.2)
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 #638BDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.026
- Dark Sky Blue #448EE4 ΔE 0.030
- Cornflower Blue #6495ED ΔE 0.034
- Chefchaouen Blue #4895EF ΔE 0.040
- Faded Blue #658CBB ΔE 0.050
- Perrywinkle #8F8CE7 ΔE 0.060
- Cool Blue #4984B8 ΔE 0.063
- Water Blue #0E87CC ΔE 0.066
Use #638BDB 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.