#638ECA
Closest named color: Faded Blue (#658CBB). oklch(64.1% 0.102 256.8), rgb(99, 142, 202).
Aa
Black text reads best on this color (6.25:1).
About this color
#638ECA is a medium-light, moderately saturated blue. In OKLCH its lightness is 64%, its chroma 0.102 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Faded Blue (#658CBB), ΔE 0.022 away. Black text reads best on it, at 6.25:1.
| Hue family | Blues |
| Lightness | medium-light (64%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 6.25:1 |
| White text | 3.35:1 |
Values
| HEX | #638ECA |
| RGB | rgb(99, 142, 202) |
| HSL | hsl(215, 49%, 59%) |
| OKLCH | oklch(64.1% 0.102 256.8) |
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 #638ECA | 3.35:1 | AA large text | Lc -66.4 | Content text, not long reading |
| Black text on #638ECA | 6.25:1 | AA | Lc 43.1 | Non-text elements, placeholder text |
| #638ECA text on white | 3.35:1 | AA large text | Lc 60.9 | Content text, not long reading |
| #638ECA text on black | 6.25:1 | AA | Lc -40.8 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CEDAEC
oklch(88.5% 0.028 258.4)
-
Step 300
300
#ACC2E1
oklch(80.8% 0.05 257)
-
Step 400
400
#80A3D3
oklch(70.8% 0.081 256.4)
-
Step 500
500 (this color)
#638ECA
oklch(64.1% 0.102 256.8)
-
Step 600
600
#4674B3
oklch(55.5% 0.111 256.6)
-
Step 700
700
#38619A
oklch(49% 0.103 256.9)
-
Step 800
800
#2F507D
oklch(42.8% 0.085 256.5)
-
Step 900
900
#2A4265
oklch(37.7% 0.067 257.7)
-
Step 950
950
#19273B
oklch(27% 0.042 257.3)
#638ECA 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) | #7692CD | 0.027 |
| Deuteranopia (no green cones) | #6A88C9 | 0.017 |
| Tritanopia (no blue cones) | #319BA3 | 0.090 |
| Achromatopsia (no color) | #8C8C8C | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638ECA
#638ECA
oklch(64.1% 0.102 256.8)
- #AF843E
#AF843E
oklch(64.1% 0.102 77.3)
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 #638ECA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Faded Blue #658CBB ΔE 0.022
- Dark Sky Blue #448EE4 ΔE 0.047
- Dusty Blue #5A86AD ΔE 0.048
- Cool Blue #4984B8 ΔE 0.048
- Off Blue #5684AE ΔE 0.050
- Cornflower Blue #6495ED ΔE 0.053
- Silver Lake Blue #778DA9 ΔE 0.053
- Soft Blue #6488EA ΔE 0.055
Use #638ECA 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.