#638CD7
Closest named color: Dark Sky Blue (#448EE4). oklch(64.3% 0.122 261.8), rgb(99, 140, 215).
Aa
Black text reads best on this color (6.26:1).
About this color
#638CD7 is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.122 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.033 away. Black text reads best on it, at 6.26:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 6.26:1 |
| White text | 3.35:1 |
Values
| HEX | #638CD7 |
| RGB | rgb(99, 140, 215) |
| HSL | hsl(219, 59%, 62%) |
| OKLCH | oklch(64.3% 0.122 261.8) |
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 #638CD7 | 3.35:1 | AA large text | Lc -66.3 | Content text, not long reading |
| Black text on #638CD7 | 6.26:1 | AA | Lc 43.2 | Non-text elements, placeholder text |
| #638CD7 text on white | 3.35:1 | AA large text | Lc 60.8 | Content text, not long reading |
| #638CD7 text on black | 6.26:1 | AA | Lc -40.9 | 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
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CDDAF0
oklch(88.5% 0.033 261)
-
Step 300
300
#ACC1E8
oklch(80.8% 0.06 262.8)
-
Step 400
400
#80A1DC
oklch(70.7% 0.094 261.7)
-
Step 500
500 (this color)
#638CD7
oklch(64.3% 0.122 261.8)
-
Step 600
600
#4671C0
oklch(55.6% 0.132 261.5)
-
Step 700
700
#385EA6
oklch(49.1% 0.123 261.9)
-
Step 800
800
#2E4D86
oklch(42.6% 0.102 261.6)
-
Step 900
900
#29416C
oklch(37.8% 0.08 261.3)
-
Step 950
950
#18263F
oklch(27% 0.051 261.4)
#638CD7 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) | #6E92DA | 0.022 |
| Deuteranopia (no green cones) | #6087D5 | 0.014 |
| Tritanopia (no blue cones) | #219CA7 | 0.109 |
| Achromatopsia (no color) | #8C8C8C | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638CD7
#638CD7
oklch(64.3% 0.122 261.8)
- #B28421
#B28421
oklch(64.2% 0.122 81.4)
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 #638CD7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.033
- Soft Blue #6488EA ΔE 0.033
- Cornflower Blue #6495ED ΔE 0.037
- Chefchaouen Blue #4895EF ΔE 0.043
- Faded Blue #658CBB ΔE 0.043
- Cool Blue #4984B8 ΔE 0.059
- Perrywinkle #8F8CE7 ΔE 0.062
- Water Blue #0E87CC ΔE 0.065
Use #638CD7 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.