#638DCF
Closest named color: Faded Blue (#658CBB). oklch(64.1% 0.11 259.2), rgb(99, 141, 207).
Aa
Black text reads best on this color (6.24:1).
About this color
#638DCF is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.110 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.030 away. Black text reads best on it, at 6.24:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.24:1 |
| White text | 3.36:1 |
Values
| HEX | #638DCF |
| RGB | rgb(99, 141, 207) |
| HSL | hsl(217, 53%, 60%) |
| OKLCH | oklch(64.1% 0.11 259.2) |
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 #638DCF | 3.36:1 | AA large text | Lc -66.4 | Content text, not long reading |
| Black text on #638DCF | 6.24:1 | AA | Lc 43.1 | Non-text elements, placeholder text |
| #638DCF text on white | 3.36:1 | AA large text | Lc 61.0 | Content text, not long reading |
| #638DCF text on black | 6.24:1 | AA | Lc -40.7 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CEDAED
oklch(88.5% 0.029 259.6)
-
Step 300
300
#ACC2E4
oklch(80.9% 0.054 259)
-
Step 400
400
#80A2D7
oklch(70.7% 0.087 259.1)
-
Step 500
500 (this color)
#638DCF
oklch(64.1% 0.11 259.2)
-
Step 600
600
#4673B9
oklch(55.7% 0.12 258.9)
-
Step 700
700
#38609F
oklch(49.1% 0.111 259.1)
-
Step 800
800
#2F4F81
oklch(42.8% 0.092 259)
-
Step 900
900
#2A4267
oklch(37.8% 0.07 258.8)
-
Step 950
950
#19273D
oklch(27.2% 0.046 259.2)
#638DCF 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) | #7392D2 | 0.025 |
| Deuteranopia (no green cones) | #6687CE | 0.016 |
| Tritanopia (no blue cones) | #2B9CA5 | 0.098 |
| Achromatopsia (no color) | #8C8C8C | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638DCF
#638DCF
oklch(64.1% 0.11 259.2)
- #B08434
#B08434
oklch(64.1% 0.11 79.3)
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 #638DCF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.030
- Dark Sky Blue #448EE4 ΔE 0.041
- Soft Blue #6488EA ΔE 0.046
- Cornflower Blue #6495ED ΔE 0.046
- Cool Blue #4984B8 ΔE 0.051
- Chefchaouen Blue #4895EF ΔE 0.051
- Dusty Blue #5A86AD ΔE 0.054
- Off Blue #5684AE ΔE 0.055
Use #638DCF 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.