#636588
Closest named color: Metallic Blue (#4F738E). oklch(51.9% 0.055 281.7), rgb(99, 101, 136).
Aa
White text reads best on this color (5.60:1).
About this color
#636588 is a medium-dark, muted purple. In OKLCH its lightness is 52%, its chroma 0.055 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.044 away. White text reads best on it, at 5.60:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | muted (0.055) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.74:1 |
| White text | 5.60:1 |
Values
| HEX | #636588 |
| RGB | rgb(99, 101, 136) |
| HSL | hsl(237, 16%, 46%) |
| OKLCH | oklch(51.9% 0.055 281.7) |
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 #636588 | 5.60:1 | AA | Lc -83.3 | Fine for body text |
| Black text on #636588 | 3.74:1 | AA large text | Lc 26.1 | Dividers and decoration only |
| #636588 text on white | 5.60:1 | AA | Lc 78.0 | Fine for body text |
| #636588 text on black | 3.74:1 | AA large text | Lc -23.8 | Dividers and decoration only |
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 700.
-
Step 50
50
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E9E9EF
oklch(93.6% 0.008 286.2)
-
Step 200
200
#D7D8E3
oklch(88.5% 0.015 281.9)
-
Step 300
300
#BDBFD2
oklch(80.9% 0.027 281)
-
Step 400
400
#9C9EBB
oklch(70.7% 0.042 282.1)
-
Step 500
500
#8486AA
oklch(63.1% 0.054 282.2)
-
Step 600
600
#6D6F96
oklch(55.5% 0.06 282)
-
Step 700
700 (this color)
#636588
oklch(51.9% 0.055 281.7)
-
Step 800
800
#4B4C68
oklch(42.7% 0.046 282.7)
-
Step 900
900
#3E3F54
oklch(37.6% 0.036 282.4)
-
Step 950
950
#242531
oklch(26.9% 0.022 281.1)
#636588 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) | #5B698A | 0.015 |
| Deuteranopia (no green cones) | #5A6687 | 0.013 |
| Tritanopia (no blue cones) | #5A6B71 | 0.048 |
| Achromatopsia (no color) | #686868 | 0.055 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #636588
#636588
oklch(51.9% 0.055 281.7)
- #6F6A44
#6F6A44
oklch(51.9% 0.055 101.7)
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 #636588, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.044
- Slate #516572 ΔE 0.046
- Dusky Blue #475F94 ΔE 0.050
- Dusty Purple #825F87 ΔE 0.051
- Muted Purple #805B87 ΔE 0.052
- Dusty Grape #545775 ΔE 0.053
- Denim #3B638C ΔE 0.053
- Dull Blue #49759C ΔE 0.054
Use #636588 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.