#638DC0
Closest named color: Faded Blue (#658CBB). oklch(63.4% 0.09 253.8), rgb(99, 141, 192).
Aa
Black text reads best on this color (6.10:1).
About this color
#638DC0 is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.090 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.007 away. Black text reads best on it, at 6.10:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.090) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.10:1 |
| White text | 3.44:1 |
Values
| HEX | #638DC0 |
| RGB | rgb(99, 141, 192) |
| HSL | hsl(213, 42%, 57%) |
| OKLCH | oklch(63.4% 0.09 253.8) |
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 #638DC0 | 3.44:1 | AA large text | Lc -67.3 | Content text, not long reading |
| Black text on #638DC0 | 6.10:1 | AA | Lc 42.2 | Non-text elements, placeholder text |
| #638DC0 text on white | 3.44:1 | AA large text | Lc 61.9 | Content text, not long reading |
| #638DC0 text on black | 6.10:1 | AA | Lc -39.8 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EAF2
oklch(93.5% 0.013 255.5)
-
Step 200
200
#CEDAE9
oklch(88.4% 0.024 254)
-
Step 300
300
#ADC3DD
oklch(80.9% 0.044 252.7)
-
Step 400
400
#82A3CC
oklch(70.6% 0.071 254.1)
-
Step 500
500 (this color)
#638DC0
oklch(63.4% 0.09 253.8)
-
Step 600
600
#4976AB
oklch(55.7% 0.097 253.4)
-
Step 700
700
#3A6393
oklch(49.2% 0.09 253.4)
-
Step 800
800
#305177
oklch(42.8% 0.075 253)
-
Step 900
900
#2B4360
oklch(37.7% 0.058 253.8)
-
Step 950
950
#192738
oklch(26.9% 0.037 253.8)
#638DC0 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) | #798FC2 | 0.028 |
| Deuteranopia (no green cones) | #6E86BF | 0.022 |
| Tritanopia (no blue cones) | #3A989F | 0.078 |
| Achromatopsia (no color) | #8A8A8A | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638DC0
#638DC0
oklch(63.4% 0.09 253.8)
- #AB8249
#AB8249
oklch(63.4% 0.09 74)
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 #638DC0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.007
- Dusty Blue #5A86AD ΔE 0.034
- Off Blue #5684AE ΔE 0.038
- Cool Blue #4984B8 ΔE 0.041
- Silver Lake Blue #778DA9 ΔE 0.041
- Blue Grey #758DA3 ΔE 0.048
- Steel Blue #4682B4 ΔE 0.048
- Dark Sky Blue #448EE4 ΔE 0.059
Use #638DC0 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.