#638CD2
Closest named color: Faded Blue (#658CBB). oklch(64% 0.115 260.6), rgb(99, 140, 210).
Aa
Black text reads best on this color (6.21:1).
About this color
#638CD2 is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.115 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.035 away. Black text reads best on it, at 6.21:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.21:1 |
| White text | 3.38:1 |
Values
| HEX | #638CD2 |
| RGB | rgb(99, 140, 210) |
| HSL | hsl(218, 55%, 61%) |
| OKLCH | oklch(64% 0.115 260.6) |
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 #638CD2 | 3.38:1 | AA large text | Lc -66.6 | Content text, not long reading |
| Black text on #638CD2 | 6.21:1 | AA | Lc 42.9 | Non-text elements, placeholder text |
| #638CD2 text on white | 3.38:1 | AA large text | Lc 61.1 | Content text, not long reading |
| #638CD2 text on black | 6.21:1 | AA | Lc -40.6 | 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
#F3F6FB
oklch(97.2% 0.007 260.7)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CEDAEE
oklch(88.5% 0.03 260.7)
-
Step 300
300
#ACC2E6
oklch(81% 0.056 260.2)
-
Step 400
400
#80A1D9
oklch(70.6% 0.09 260.7)
-
Step 500
500 (this color)
#638CD2
oklch(64% 0.115 260.6)
-
Step 600
600
#4772BC
oklch(55.7% 0.125 260.6)
-
Step 700
700
#385FA2
oklch(49.1% 0.117 260.5)
-
Step 800
800
#2F4E83
oklch(42.7% 0.096 260.5)
-
Step 900
900
#2A4169
oklch(37.7% 0.075 260.9)
-
Step 950
950
#19263E
oklch(27% 0.049 262)
#638CD2 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) | #7091D5 | 0.022 |
| Deuteranopia (no green cones) | #6387D1 | 0.013 |
| Tritanopia (no blue cones) | #289BA5 | 0.103 |
| Achromatopsia (no color) | #8C8C8C | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638CD2
#638CD2
oklch(64% 0.115 260.6)
- #B0842C
#B0842C
oklch(64.1% 0.115 80.9)
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 #638CD2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.035
- Dark Sky Blue #448EE4 ΔE 0.037
- Soft Blue #6488EA ΔE 0.040
- Cornflower Blue #6495ED ΔE 0.043
- Chefchaouen Blue #4895EF ΔE 0.048
- Cool Blue #4984B8 ΔE 0.053
- Dusty Blue #5A86AD ΔE 0.058
- Off Blue #5684AE ΔE 0.059
Use #638CD2 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.