#636FB2
Closest named color: French Blue (#436BAD). oklch(56.1% 0.105 274.8), rgb(99, 111, 178).
Aa
White text reads best on this color (4.72:1).
About this color
#636FB2 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.105 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.043 away. White text reads best on it, at 4.72:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.44:1 |
| White text | 4.72:1 |
Values
| HEX | #636FB2 |
| RGB | rgb(99, 111, 178) |
| HSL | hsl(231, 34%, 54%) |
| OKLCH | oklch(56.1% 0.105 274.8) |
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 #636FB2 | 4.72:1 | AA | Lc -78.1 | Fine for body text |
| Black text on #636FB2 | 4.44:1 | AA large text | Lc 31.4 | Non-text elements, placeholder text |
| #636FB2 text on white | 4.72:1 | AA | Lc 72.7 | Content text, not long reading |
| #636FB2 text on black | 4.44:1 | AA large text | Lc -29.0 | 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 600.
-
Step 50
50
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EB
oklch(88.5% 0.026 276.4)
-
Step 300
300
#B7BFE0
oklch(80.9% 0.047 274.6)
-
Step 400
400
#929DD0
oklch(70.6% 0.076 274.9)
-
Step 500
500
#7885C4
oklch(63.2% 0.096 274.4)
-
Step 600
600 (this color)
#636FB2
oklch(56.1% 0.105 274.8)
-
Step 700
700
#515B98
oklch(49.1% 0.098 275.1)
-
Step 800
800
#424B7B
oklch(42.8% 0.08 274.5)
-
Step 900
900
#383F63
oklch(37.8% 0.062 274.7)
-
Step 950
950
#21253A
oklch(27.1% 0.04 275.2)
#636FB2 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) | #5777B5 | 0.024 |
| Deuteranopia (no green cones) | #5070B0 | 0.024 |
| Tritanopia (no blue cones) | #487D88 | 0.093 |
| Achromatopsia (no color) | #737373 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #636FB2
#636FB2
oklch(56.1% 0.105 274.8)
- #88741C
#88741C
oklch(56.2% 0.105 95.5)
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 #636FB2, closest first.
No curated palette has a color within ΔE 0.04 of #636FB2.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.043
- Flat Blue #3C73A8 ΔE 0.049
- Windows Blue #3778BF ΔE 0.051
- Dull Blue #49759C ΔE 0.053
- Muted Blue #3B719F ΔE 0.058
- Steel Blue #4682B4 ΔE 0.058
- Stormy Blue #507B9C ΔE 0.059
- Cool Blue #4984B8 ΔE 0.060
Use #636FB2 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.