#635DE9
Closest named color: Dark Periwinkle (#665FD1). oklch(56.4% 0.205 279.5), rgb(99, 93, 233).
Aa
White text reads best on this color (4.91:1).
About this color
#635DE9 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.205 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.038 away. White text reads best on it, at 4.91:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.205) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.27:1 |
| White text | 4.91:1 |
Values
| HEX | #635DE9 |
| RGB | rgb(99, 93, 233) |
| HSL | hsl(243, 76%, 64%) |
| OKLCH | oklch(56.4% 0.205 279.5) |
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 #635DE9 | 4.91:1 | AA | Lc -79.0 | Fine for body text |
| Black text on #635DE9 | 4.27:1 | AA large text | Lc 30.5 | Non-text elements, placeholder text |
| #635DE9 text on white | 4.91:1 | AA | Lc 73.6 | Content text, not long reading |
| #635DE9 text on black | 4.27:1 | AA large text | Lc -28.1 | 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
#E6E8FC
oklch(93.5% 0.027 281.3)
-
Step 200
200
#D1D6FB
oklch(88.4% 0.051 279.2)
-
Step 300
300
#B4BBFC
oklch(81% 0.092 279.4)
-
Step 400
400
#8F94FA
oklch(70.6% 0.148 279.8)
-
Step 500
500
#7676F7
oklch(63.1% 0.188 279.6)
-
Step 600
600 (this color)
#635DE9
oklch(56.4% 0.205 279.5)
-
Step 700
700
#5149C8
oklch(49.1% 0.19 279.6)
-
Step 800
800
#423DA2
oklch(42.7% 0.158 279.6)
-
Step 900
900
#373580
oklch(37.6% 0.123 279.9)
-
Step 950
950
#20204B
oklch(27% 0.078 279.9)
#635DE9 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) | #0076EE | 0.083 |
| Deuteranopia (no green cones) | #006BE6 | 0.077 |
| Tritanopia (no blue cones) | #087F9A | 0.177 |
| Achromatopsia (no color) | #717171 | 0.205 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #635DE9
#635DE9
oklch(56.4% 0.205 279.5)
- #877600
#877600
oklch(56.4% 0.117 99.2)
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 #635DE9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.038
- Neon Blue #4361EE ΔE 0.040
- Light Indigo #6D5ACF ΔE 0.042
- Warm Blue #4B57DB ΔE 0.043
- Slate Blue #6A5ACD ΔE 0.044
- Medium Slate Blue #7B68EE ΔE 0.047
- Royal Blue #4169E1 ΔE 0.048
- Iris #6258C4 ΔE 0.057
Use #635DE9 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.