#645CF0
Closest named color: Neon Blue (#4361EE). oklch(56.9% 0.215 279.5), rgb(100, 92, 240).
Aa
White text reads best on this color (4.84:1).
About this color
#645CF0 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.215 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.041 away. White text reads best on it, at 4.84:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.215) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.33:1 |
| White text | 4.84:1 |
Values
| HEX | #645CF0 |
| RGB | rgb(100, 92, 240) |
| HSL | hsl(243, 83%, 65%) |
| OKLCH | oklch(56.9% 0.215 279.5) |
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 #645CF0 | 4.84:1 | AA | Lc -78.5 | Fine for body text |
| Black text on #645CF0 | 4.33:1 | AA large text | Lc 31.0 | Non-text elements, placeholder text |
| #645CF0 text on white | 4.84:1 | AA | Lc 73.1 | Content text, not long reading |
| #645CF0 text on black | 4.33:1 | AA large text | Lc -28.6 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E8FD
oklch(93.5% 0.029 279.4)
-
Step 200
200
#D1D6FD
oklch(88.5% 0.054 279.5)
-
Step 300
300
#B3BAFF
oklch(80.8% 0.098 279.5)
-
Step 400
400
#8E93FE
oklch(70.6% 0.155 279.6)
-
Step 500
500
#7574FC
oklch(63% 0.197 279.4)
-
Step 600
600 (this color)
#645CF0
oklch(56.9% 0.215 279.5)
-
Step 700
700
#5146CD
oklch(49.1% 0.2 279.7)
-
Step 800
800
#423BA6
oklch(42.7% 0.166 279.7)
-
Step 900
900
#373483
oklch(37.6% 0.129 279.9)
-
Step 950
950
#201F4D
oklch(26.9% 0.083 280.3)
#645CF0 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) | #0077F5 | 0.085 |
| Deuteranopia (no green cones) | #006CED | 0.078 |
| Tritanopia (no blue cones) | #00819D | 0.185 |
| Achromatopsia (no color) | #717171 | 0.216 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645CF0
#645CF0
oklch(56.9% 0.215 279.5)
- #887700
#887700
oklch(56.8% 0.118 99.3)
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 #645CF0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.041
- Medium Slate Blue #7B68EE ΔE 0.047
- Dark Periwinkle #665FD1 ΔE 0.048
- Warm Blue #4B57DB ΔE 0.050
- Light Indigo #6D5ACF ΔE 0.052
- Royal Blue #4169E1 ΔE 0.054
- Slate Blue #6A5ACD ΔE 0.054
- Purpley #8756E4 ΔE 0.059
Use #645CF0 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.