#636AE5
Closest named color: Medium Slate Blue (#7B68EE). oklch(58.4% 0.183 276.7), rgb(99, 106, 229).
Aa
Black text reads best on this color (4.72:1).
About this color
#636AE5 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.183 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Medium Slate Blue (#7B68EE), ΔE 0.037 away. Black text reads best on it, at 4.72:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.183) |
| Temperature | cool |
| Nearest name | Medium Slate Blue (#7B68EE) |
| Black text | 4.72:1 |
| White text | 4.44:1 |
Values
| HEX | #636AE5 |
| RGB | rgb(99, 106, 229) |
| HSL | hsl(237, 71%, 64%) |
| OKLCH | oklch(58.4% 0.183 276.7) |
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 #636AE5 | 4.44:1 | AA large text | Lc -76.0 | Fine for body text |
| Black text on #636AE5 | 4.72:1 | AA | Lc 33.6 | Non-text elements, placeholder text |
| #636AE5 text on white | 4.44:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #636AE5 text on black | 4.72:1 | AA | Lc -31.1 | 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 600.
-
Step 50
50
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FA
oklch(93.6% 0.023 275.4)
-
Step 200
200
#D1D7F8
oklch(88.5% 0.046 277.3)
-
Step 300
300
#B2BCF6
oklch(80.8% 0.083 276.8)
-
Step 400
400
#8C98F2
oklch(70.8% 0.132 276.7)
-
Step 500
500
#717BED
oklch(63% 0.169 276.6)
-
Step 600
600 (this color)
#636AE5
oklch(58.4% 0.183 276.7)
-
Step 700
700
#4C50BE
oklch(49.2% 0.169 276.6)
-
Step 800
800
#3E429A
oklch(42.7% 0.141 276.7)
-
Step 900
900
#34397A
oklch(37.7% 0.109 276.5)
-
Step 950
950
#1E2248
oklch(27% 0.07 276.2)
#636AE5 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) | #1A7DE9 | 0.070 |
| Deuteranopia (no green cones) | #0072E2 | 0.071 |
| Tritanopia (no blue cones) | #11869D | 0.160 |
| Achromatopsia (no color) | #787878 | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #636AE5
#636AE5
oklch(58.4% 0.183 276.7)
- #907A00
#907A00
oklch(58.3% 0.12 96.4)
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 #636AE5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Medium Slate Blue #7B68EE ΔE 0.037
- Dark Periwinkle #665FD1 ΔE 0.038
- Royal Blue #4169E1 ΔE 0.041
- Cornflower #6A79F7 ΔE 0.045
- Light Indigo #6D5ACF ΔE 0.049
- Neon Blue #4361EE ΔE 0.049
- Slate Blue #6A5ACD ΔE 0.050
- Warm Blue #4B57DB ΔE 0.060
Use #636AE5 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.