#645DF8
Closest named color: Neon Blue (#4361EE). oklch(57.7% 0.224 278.8), rgb(100, 93, 248).
Aa
White text reads best on this color (4.70:1).
About this color
#645DF8 is a medium-dark, vivid blue. In OKLCH its lightness is 58%, its chroma 0.224 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.044 away. White text reads best on it, at 4.70:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.224) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.46:1 |
| White text | 4.70:1 |
Values
| HEX | #645DF8 |
| RGB | rgb(100, 93, 248) |
| HSL | hsl(243, 92%, 67%) |
| OKLCH | oklch(57.7% 0.224 278.8) |
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 #645DF8 | 4.70:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #645DF8 | 4.46:1 | AA large text | Lc 32.0 | Non-text elements, placeholder text |
| #645DF8 text on white | 4.70:1 | AA | Lc 72.1 | Content text, not long reading |
| #645DF8 text on black | 4.46:1 | AA large text | Lc -29.6 | Dividers and decoration only |
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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E5E8FE
oklch(93.5% 0.03 279.6)
-
Step 200
200
#D0D6FE
oklch(88.4% 0.055 278.5)
-
Step 300
300
#B2BBFF
oklch(81% 0.097 278.2)
-
Step 400
400
#8D94FF
oklch(70.8% 0.155 278.8)
-
Step 500
500
#7374FF
oklch(63.1% 0.202 278.6)
-
Step 600
600 (this color)
#645DF8
oklch(57.7% 0.224 278.8)
-
Step 700
700
#4F45D2
oklch(49.2% 0.208 278.7)
-
Step 800
800
#403AA9
oklch(42.7% 0.171 278.7)
-
Step 900
900
#353486
oklch(37.7% 0.134 278.4)
-
Step 950
950
#1F1F4E
oklch(26.9% 0.084 279.1)
#645DF8 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) | #007AFD | 0.086 |
| Deuteranopia (no green cones) | #006DF5 | 0.077 |
| Tritanopia (no blue cones) | #0084A2 | 0.189 |
| Achromatopsia (no color) | #747474 | 0.224 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645DF8
#645DF8
oklch(57.7% 0.224 278.8)
- #8B7900
#8B7900
oklch(57.5% 0.119 98.8)
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 #645DF8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.044
- Medium Slate Blue #7B68EE ΔE 0.048
- Warm Blue #4B57DB ΔE 0.059
- Royal Blue #4169E1 ΔE 0.059
- Dark Periwinkle #665FD1 ΔE 0.060
- Purpley #8756E4 ΔE 0.064
- Light Indigo #6D5ACF ΔE 0.064
- Cornflower #6A79F7 ΔE 0.065
Use #645DF8 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.