#636CFA
Closest named color: Cornflower (#6A79F7). oklch(60.3% 0.208 275.5), rgb(99, 108, 250).
Aa
Black text reads best on this color (5.05:1).
About this color
#636CFA is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.208 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.034 away. Black text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.208) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.05:1 |
| White text | 4.15:1 |
Values
| HEX | #636CFA |
| RGB | rgb(99, 108, 250) |
| HSL | hsl(236, 94%, 68%) |
| OKLCH | oklch(60.3% 0.208 275.5) |
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 #636CFA | 4.15:1 | AA large text | Lc -73.7 | Content text, not long reading |
| Black text on #636CFA | 5.05:1 | AA | Lc 35.9 | Non-text elements, placeholder text |
| #636CFA text on white | 4.15:1 | AA large text | Lc 68.2 | Content text, not long reading |
| #636CFA text on black | 5.05:1 | AA | Lc -33.5 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E9FE
oklch(93.7% 0.029 275.2)
-
Step 200
200
#CED7FF
oklch(88.5% 0.056 275.2)
-
Step 300
300
#AFBCFF
oklch(80.9% 0.096 275.6)
-
Step 400
400
#8796FF
oklch(70.7% 0.154 275.6)
-
Step 500
500 (this color)
#636CFA
oklch(60.3% 0.208 275.5)
-
Step 600
600
#5658F4
oklch(55.6% 0.227 275.5)
-
Step 700
700
#4747D4
oklch(49.1% 0.21 275.4)
-
Step 800
800
#3A3BAB
oklch(42.6% 0.174 275.7)
-
Step 900
900
#303588
oklch(37.7% 0.136 275.1)
-
Step 950
950
#1C204F
oklch(27% 0.085 275.5)
#636CFA 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) | #0083FF | 0.075 |
| Deuteranopia (no green cones) | #0076F7 | 0.068 |
| Tritanopia (no blue cones) | #008EA9 | 0.177 |
| Achromatopsia (no color) | #7C7C7C | 0.209 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #636CFA
#636CFA
oklch(60.3% 0.208 275.5)
- #987F00
#987F00
oklch(60.2% 0.124 95.1)
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 #636CFA, closest first.
No curated palette has a color within ΔE 0.04 of #636CFA.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.034
- Medium Slate Blue #7B68EE ΔE 0.038
- Neon Blue #4361EE ΔE 0.053
- Royal Blue #4169E1 ΔE 0.057
- Clear Blue #247AFD ΔE 0.059
- Dark Periwinkle #665FD1 ΔE 0.067
- Cerulean Blue #056EEE ΔE 0.072
- Purpley #8756E4 ΔE 0.074
Use #636CFA 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.