#636FF4
Closest named color: Cornflower (#6A79F7). oklch(60.4% 0.197 275), rgb(99, 111, 244).
Aa
Black text reads best on this color (5.11:1).
About this color
#636FF4 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.197 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.027 away. Black text reads best on it, at 5.11:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.197) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.11:1 |
| White text | 4.10:1 |
Values
| HEX | #636FF4 |
| RGB | rgb(99, 111, 244) |
| HSL | hsl(235, 87%, 67%) |
| OKLCH | oklch(60.4% 0.197 275) |
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 #636FF4 | 4.10:1 | AA large text | Lc -73.4 | Content text, not long reading |
| Black text on #636FF4 | 5.11:1 | AA | Lc 36.2 | Non-text elements, placeholder text |
| #636FF4 text on white | 4.10:1 | AA large text | Lc 67.9 | Content text, not long reading |
| #636FF4 text on black | 5.11:1 | AA | Lc -33.8 | 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
#E4E9FD
oklch(93.6% 0.028 274.7)
-
Step 200
200
#CED7FD
oklch(88.4% 0.053 274.8)
-
Step 300
300
#AEBCFF
oklch(80.9% 0.096 274.9)
-
Step 400
400
#8696FF
oklch(70.7% 0.154 275.2)
-
Step 500
500 (this color)
#636FF4
oklch(60.4% 0.197 275)
-
Step 600
600
#555CED
oklch(55.6% 0.214 274.9)
-
Step 700
700
#464ACE
oklch(49% 0.199 274.9)
-
Step 800
800
#393EA7
oklch(42.7% 0.165 274.8)
-
Step 900
900
#303684
oklch(37.6% 0.129 275)
-
Step 950
950
#1C214D
oklch(27.1% 0.08 274.8)
#636FF4 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) | #0384F9 | 0.072 |
| Deuteranopia (no green cones) | #0077F1 | 0.067 |
| Tritanopia (no blue cones) | #008EA7 | 0.169 |
| Achromatopsia (no color) | #7D7D7D | 0.197 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #636FF4
#636FF4
oklch(60.4% 0.197 275)
- #997F00
#997F00
oklch(60.3% 0.124 94.5)
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 #636FF4, closest first.
No curated palette has a color within ΔE 0.04 of #636FF4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.027
- Medium Slate Blue #7B68EE ΔE 0.036
- Royal Blue #4169E1 ΔE 0.053
- Neon Blue #4361EE ΔE 0.055
- Clear Blue #247AFD ΔE 0.057
- Dark Periwinkle #665FD1 ΔE 0.062
- Soft Blue #6488EA ΔE 0.066
- Cerulean Blue #056EEE ΔE 0.071
Use #636FF4 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.