#638ABC
Closest named color: Faded Blue (#658CBB). oklch(62.5% 0.088 255), rgb(99, 138, 188).
Aa
Black text reads best on this color (5.89:1).
About this color
#638ABC is a medium-light, moderately saturated blue. In OKLCH its lightness is 63%, its chroma 0.088 and its hue 255°. 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 5.89:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Faded Blue (#658CBB) |
| Black text | 5.89:1 |
| White text | 3.56:1 |
Values
| HEX | #638ABC |
| RGB | rgb(99, 138, 188) |
| HSL | hsl(214, 40%, 56%) |
| OKLCH | oklch(62.5% 0.088 255) |
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 #638ABC | 3.56:1 | AA large text | Lc -68.6 | Content text, not long reading |
| Black text on #638ABC | 5.89:1 | AA | Lc 40.9 | Non-text elements, placeholder text |
| #638ABC text on white | 3.56:1 | AA large text | Lc 63.1 | Content text, not long reading |
| #638ABC text on black | 5.89:1 | AA | Lc -38.5 | 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
#CFDAE9
oklch(88.5% 0.024 256.1)
-
Step 300
300
#AFC3DD
oklch(81% 0.043 255)
-
Step 400
400
#84A3CB
oklch(70.7% 0.068 255)
-
Step 500
500 (this color)
#638ABC
oklch(62.5% 0.088 255)
-
Step 600
600
#4B75AA
oklch(55.5% 0.095 254.9)
-
Step 700
700
#3C6292
oklch(49% 0.089 254.9)
-
Step 800
800
#325077
oklch(42.6% 0.075 255.5)
-
Step 900
900
#2C4360
oklch(37.8% 0.058 254.7)
-
Step 950
950
#1A2738
oklch(26.9% 0.037 255.4)
#638ABC 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) | #778CBE | 0.026 |
| Deuteranopia (no green cones) | #6C84BB | 0.018 |
| Tritanopia (no blue cones) | #3D959B | 0.077 |
| Achromatopsia (no color) | #888888 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638ABC
#638ABC
oklch(62.5% 0.088 255)
- #A78048
#A78048
oklch(62.6% 0.088 75)
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 #638ABC, 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 0.027
- Off Blue #5684AE ΔE 0.030
- Cool Blue #4984B8 ΔE 0.035
- Silver Lake Blue #778DA9 ΔE 0.040
- Steel Blue #4682B4 ΔE 0.042
- Blue Grey #758DA3 ΔE 0.046
- Light Slate Gray #778899 ΔE 0.056
Use #638ABC 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.