#635FD1
Closest named color: Dark Periwinkle (#665FD1). oklch(55% 0.171 280.8), rgb(99, 95, 209).
Aa
White text reads best on this color (5.13:1).
About this color
#635FD1 is a medium-dark, vivid purple. In OKLCH its lightness is 55%, its chroma 0.171 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.004 away. White text reads best on it, at 5.13:1.
| Hue family | Purples |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.08:1 |
| White text | 5.13:1 |
Values
| HEX | #635FD1 |
| RGB | rgb(99, 95, 209) |
| HSL | hsl(242, 55%, 60%) |
| OKLCH | oklch(55% 0.171 280.8) |
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 #635FD1 | 5.13:1 | AA | Lc -80.5 | Fine for body text |
| Black text on #635FD1 | 4.08:1 | AA large text | Lc 29.0 | Dividers and decoration only |
| #635FD1 text on white | 5.13:1 | AA | Lc 75.1 | Fine for body text |
| #635FD1 text on black | 4.08:1 | AA large text | Lc -26.6 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F9
oklch(93.7% 0.022 280.3)
-
Step 200
200
#D3D7F6
oklch(88.6% 0.043 279.7)
-
Step 300
300
#B7BCF2
oklch(81% 0.076 280.4)
-
Step 400
400
#9397EB
oklch(70.7% 0.122 280.7)
-
Step 500
500
#7A7BE5
oklch(63.2% 0.156 280.5)
-
Step 600
600 (this color)
#635FD1
oklch(55% 0.171 280.8)
-
Step 700
700
#544FB7
oklch(49% 0.159 280.9)
-
Step 800
800
#444294
oklch(42.7% 0.131 280.4)
-
Step 900
900
#393876
oklch(37.6% 0.103 280.9)
-
Step 950
950
#212245
oklch(27.1% 0.064 280)
#635FD1 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) | #1772D5 | 0.077 |
| Deuteranopia (no green cones) | #0069CF | 0.079 |
| Tritanopia (no blue cones) | #34798F | 0.147 |
| Achromatopsia (no color) | #6D6D6D | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #635FD1
#635FD1
oklch(55% 0.171 280.8)
- #817200
#817200
oklch(54.9% 0.114 100.2)
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 #635FD1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.004
- Slate Blue #6A5ACD ΔE 0.016
- Light Indigo #6D5ACF ΔE 0.018
- Iris #6258C4 ΔE 0.025
- Warm Blue #4B57DB ΔE 0.044
- Royal Blue #4169E1 ΔE 0.049
- Neon Blue #4361EE ΔE 0.059
- Medium Slate Blue #7B68EE ΔE 0.061
Use #635FD1 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.