#636DEE
Closest named color: Cornflower (#6A79F7). oklch(59.6% 0.191 275.6), rgb(99, 109, 238).
Aa
Black text reads best on this color (4.95:1).
About this color
#636DEE is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.191 and its hue 276°. 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 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.191) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 4.95:1 |
| White text | 4.24:1 |
Values
| HEX | #636DEE |
| RGB | rgb(99, 109, 238) |
| HSL | hsl(236, 80%, 66%) |
| OKLCH | oklch(59.6% 0.191 275.6) |
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 #636DEE | 4.24:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #636DEE | 4.95:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #636DEE text on white | 4.24:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #636DEE text on black | 4.95:1 | AA | Lc -32.7 | 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
#CFD7FC
oklch(88.5% 0.052 275.7)
-
Step 300
300
#AFBCFD
oklch(80.9% 0.093 275.4)
-
Step 400
400
#8796FD
oklch(70.6% 0.151 275.6)
-
Step 500
500 (this color)
#636DEE
oklch(59.6% 0.191 275.6)
-
Step 600
600
#575DE9
oklch(55.6% 0.207 275.5)
-
Step 700
700
#484BCB
oklch(49.1% 0.194 275.6)
-
Step 800
800
#3B3FA4
oklch(42.8% 0.16 275.6)
-
Step 900
900
#313782
oklch(37.7% 0.125 275.2)
-
Step 950
950
#1D214C
oklch(27.1% 0.078 275.8)
#636DEE 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) | #0F81F2 | 0.071 |
| Deuteranopia (no green cones) | #0075EB | 0.069 |
| Tritanopia (no blue cones) | #008BA3 | 0.166 |
| Achromatopsia (no color) | #7B7B7B | 0.192 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #636DEE
#636DEE
oklch(59.6% 0.191 275.6)
- #957D00
#957D00
oklch(59.5% 0.122 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 #636DEE, closest first.
No curated palette has a color within ΔE 0.04 of #636DEE.
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 0.034
- Royal Blue #4169E1 ΔE 0.047
- Neon Blue #4361EE ΔE 0.051
- Dark Periwinkle #665FD1 ΔE 0.053
- Clear Blue #247AFD ΔE 0.061
- Light Indigo #6D5ACF ΔE 0.062
- Slate Blue #6A5ACD ΔE 0.064
Use #636DEE 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.