#636FE9
Closest named color: Cornflower (#6A79F7). oklch(59.6% 0.182 275.2), rgb(99, 111, 233).
Aa
Black text reads best on this color (4.98:1).
About this color
#636FE9 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.182 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.033 away. Black text reads best on it, at 4.98:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.182) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 4.98:1 |
| White text | 4.21:1 |
Values
| HEX | #636FE9 |
| RGB | rgb(99, 111, 233) |
| HSL | hsl(235, 75%, 65%) |
| OKLCH | oklch(59.6% 0.182 275.2) |
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 #636FE9 | 4.21:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #636FE9 | 4.98:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #636FE9 text on white | 4.21:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #636FE9 text on black | 4.98:1 | AA | Lc -32.9 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FC
oklch(93.6% 0.026 274.1)
-
Step 200
200
#CFD7FB
oklch(88.5% 0.05 275.4)
-
Step 300
300
#B0BCFB
oklch(80.9% 0.09 275.9)
-
Step 400
400
#8897F8
oklch(70.6% 0.142 275.5)
-
Step 500
500 (this color)
#636FE9
oklch(59.6% 0.182 275.2)
-
Step 600
600
#575FE4
oklch(55.5% 0.198 275.3)
-
Step 700
700
#484EC6
oklch(49.2% 0.183 275.2)
-
Step 800
800
#3B41A0
oklch(42.8% 0.151 275.2)
-
Step 900
900
#31387F
oklch(37.7% 0.119 274.9)
-
Step 950
950
#1D214A
oklch(26.9% 0.075 275.9)
#636FE9 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) | #2681ED | 0.063 |
| Deuteranopia (no green cones) | #0076E6 | 0.068 |
| Tritanopia (no blue cones) | #008BA1 | 0.161 |
| Achromatopsia (no color) | #7B7B7B | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #636FE9
#636FE9
oklch(59.6% 0.182 275.2)
- #967D00
#967D00
oklch(59.6% 0.122 94.9)
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 #636FE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.033
- Medium Slate Blue #7B68EE ΔE 0.037
- Royal Blue #4169E1 ΔE 0.046
- Dark Periwinkle #665FD1 ΔE 0.050
- Neon Blue #4361EE ΔE 0.055
- Light Indigo #6D5ACF ΔE 0.061
- Clear Blue #247AFD ΔE 0.062
- Slate Blue #6A5ACD ΔE 0.062
Use #636FE9 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.