#6368E4
Closest named color: Dark Periwinkle (#665FD1). oklch(57.9% 0.184 277.2), rgb(99, 104, 228).
Aa
Black text reads best on this color (4.63:1).
About this color
#6368E4 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.184 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.034 away. Black text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.184) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.63:1 |
| White text | 4.53:1 |
Values
| HEX | #6368E4 |
| RGB | rgb(99, 104, 228) |
| HSL | hsl(238, 70%, 64%) |
| OKLCH | oklch(57.9% 0.184 277.2) |
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 #6368E4 | 4.53:1 | AA | Lc -76.6 | Fine for body text |
| Black text on #6368E4 | 4.63:1 | AA | Lc 32.9 | Non-text elements, placeholder text |
| #6368E4 text on white | 4.53:1 | AA | Lc 71.2 | Content text, not long reading |
| #6368E4 text on black | 4.63:1 | AA | Lc -30.5 | 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 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
#B3BCF6
oklch(80.9% 0.083 277.5)
-
Step 400
400
#8C97F2
oklch(70.6% 0.133 277.2)
-
Step 500
500
#727BEE
oklch(63.2% 0.17 277)
-
Step 600
600 (this color)
#6368E4
oklch(57.9% 0.184 277.2)
-
Step 700
700
#4D4FBF
oklch(49.1% 0.172 277.2)
-
Step 800
800
#3F419A
oklch(42.6% 0.142 277.5)
-
Step 900
900
#35387B
oklch(37.6% 0.112 277.7)
-
Step 950
950
#1F2248
oklch(27.1% 0.07 277.3)
#6368E4 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) | #117CE8 | 0.073 |
| Deuteranopia (no green cones) | #0071E1 | 0.072 |
| Tritanopia (no blue cones) | #15859C | 0.161 |
| Achromatopsia (no color) | #767676 | 0.185 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6368E4
#6368E4
oklch(57.9% 0.184 277.2)
- #8E7900
#8E7900
oklch(57.8% 0.119 96.9)
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 #6368E4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.034
- Medium Slate Blue #7B68EE ΔE 0.038
- Royal Blue #4169E1 ΔE 0.040
- Light Indigo #6D5ACF ΔE 0.045
- Slate Blue #6A5ACD ΔE 0.046
- Neon Blue #4361EE ΔE 0.047
- Cornflower #6A79F7 ΔE 0.050
- Warm Blue #4B57DB ΔE 0.056
Use #6368E4 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.