#638FC7
Closest named color: Faded Blue (#658CBB). oklch(64.1% 0.098 254.9), rgb(99, 143, 199).
Aa
Black text reads best on this color (6.28:1).
About this color
#638FC7 is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.098 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.018 away. Black text reads best on it, at 6.28:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.098) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.28:1 |
| White text | 3.34:1 |
Values
| HEX | #638FC7 |
| RGB | rgb(99, 143, 199) |
| HSL | hsl(214, 47%, 58%) |
| OKLCH | oklch(64.1% 0.098 254.9) |
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 #638FC7 | 3.34:1 | AA large text | Lc -66.2 | Content text, not long reading |
| Black text on #638FC7 | 6.28:1 | AA | Lc 43.3 | Non-text elements, placeholder text |
| #638FC7 text on white | 3.34:1 | AA large text | Lc 60.7 | Content text, not long reading |
| #638FC7 text on black | 6.28:1 | AA | Lc -41.0 | 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
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CEDAEB
oklch(88.4% 0.027 257)
-
Step 300
300
#ACC3E0
oklch(80.9% 0.048 254.3)
-
Step 400
400
#80A3D0
oklch(70.6% 0.077 255)
-
Step 500
500 (this color)
#638FC7
oklch(64.1% 0.098 254.9)
-
Step 600
600
#4675B0
oklch(55.6% 0.106 254.9)
-
Step 700
700
#376297
oklch(49.1% 0.098 254.6)
-
Step 800
800
#2E507B
oklch(42.7% 0.082 255.1)
-
Step 900
900
#294363
oklch(37.8% 0.064 254.3)
-
Step 950
950
#19273A
oklch(27% 0.041 256.3)
#638FC7 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) | #7992C9 | 0.029 |
| Deuteranopia (no green cones) | #6D88C6 | 0.021 |
| Tritanopia (no blue cones) | #339CA3 | 0.086 |
| Achromatopsia (no color) | #8C8C8C | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638FC7
#638FC7
oklch(64.1% 0.098 254.9)
- #AF8444
#AF8444
oklch(64.2% 0.097 75.4)
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 #638FC7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.018
- Dusty Blue #5A86AD ΔE 0.045
- Cool Blue #4984B8 ΔE 0.048
- Off Blue #5684AE ΔE 0.048
- Silver Lake Blue #778DA9 ΔE 0.049
- Dark Sky Blue #448EE4 ΔE 0.052
- Steel Blue #4682B4 ΔE 0.056
- Blue Grey #758DA3 ΔE 0.056
Use #638FC7 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.