#636788
Closest named color: Metallic Blue (#4F738E). oklch(52.3% 0.052 279.1), rgb(99, 103, 136).
Aa
White text reads best on this color (5.48:1).
About this color
#636788 is a medium-dark, muted blue. In OKLCH its lightness is 52%, its chroma 0.052 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.040 away. White text reads best on it, at 5.48:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | muted (0.052) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.82:1 |
| White text | 5.48:1 |
Values
| HEX | #636788 |
| RGB | rgb(99, 103, 136) |
| HSL | hsl(234, 16%, 46%) |
| OKLCH | oklch(52.3% 0.052 279.1) |
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 #636788 | 5.48:1 | AA | Lc -82.7 | Fine for body text |
| Black text on #636788 | 3.82:1 | AA large text | Lc 26.7 | Dividers and decoration only |
| #636788 text on white | 5.48:1 | AA | Lc 77.4 | Fine for body text |
| #636788 text on black | 3.82:1 | AA large text | Lc -24.4 | 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
#BDBFD1
oklch(80.9% 0.025 280.8)
-
Step 400
400
#9B9EBA
oklch(70.6% 0.041 280.5)
-
Step 500
500
#8287A9
oklch(63.2% 0.051 278.3)
-
Step 600
600
#6C7094
oklch(55.6% 0.056 279.5)
-
Step 700
700 (this color)
#636788
oklch(52.3% 0.052 279.1)
-
Step 800
800
#4A4D67
oklch(42.8% 0.043 279.3)
-
Step 900
900
#3D4054
oklch(37.7% 0.034 278)
-
Step 950
950
#242531
oklch(26.9% 0.022 281.1)
#636788 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) | #5E6A89 | 0.010 |
| Deuteranopia (no green cones) | #5C6887 | 0.011 |
| Tritanopia (no blue cones) | #5A6D72 | 0.047 |
| Achromatopsia (no color) | #696969 | 0.052 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #636788
#636788
oklch(52.3% 0.052 279.1)
- #716B47
#716B47
oklch(52.4% 0.053 99.9)
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 #636788, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.040
- Slate #516572 ΔE 0.045
- Dull Blue #49759C ΔE 0.050
- Dusty Purple #825F87 ΔE 0.052
- Dim Gray #696969 ΔE 0.052
- Battleship Gray #6C757D ΔE 0.052
- Dusky Blue #475F94 ΔE 0.053
- Grey Purple #826D8C ΔE 0.053
Use #636788 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.