#603F9C
Closest named color: Rebecca Purple (#663399). oklch(45.4% 0.145 296.5), rgb(96, 63, 156).
Aa
White text reads best on this color (7.81:1).
About this color
#603F9C is a medium-dark, vivid purple. In OKLCH its lightness is 45%, its chroma 0.145 and its hue 297°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.027 away. White text reads best on it, at 7.81:1.
| Hue family | Purples |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.145) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.68:1 |
| White text | 7.81:1 |
Values
| HEX | #603F9C |
| RGB | rgb(96, 63, 156) |
| HSL | hsl(261, 42%, 43%) |
| OKLCH | oklch(45.4% 0.145 296.5) |
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 #603F9C | 7.81:1 | AAA | Lc -91.5 | Preferred for body text |
| Black text on #603F9C | 2.68:1 | Fails | Lc 17.2 | Dividers and decoration only |
| #603F9C text on white | 7.81:1 | AAA | Lc 86.8 | Fine for body text |
| #603F9C text on black | 2.68:1 | Fails | Lc -15.3 | 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 800.
-
Step 50
50
#F6F4FC
oklch(97.1% 0.011 297.6)
-
Step 100
100
#EBE7F9
oklch(93.6% 0.024 296.1)
-
Step 200
200
#DCD3F5
oklch(88.5% 0.047 297.5)
-
Step 300
300
#C5B6F2
oklch(80.9% 0.085 295.9)
-
Step 400
400
#A98DEB
oklch(70.6% 0.137 296.5)
-
Step 500
500
#956EE4
oklch(63.1% 0.173 296.4)
-
Step 600
600
#8152D2
oklch(55.6% 0.189 296.7)
-
Step 700
700
#6D42B6
oklch(49.1% 0.175 296.4)
-
Step 800
800 (this color)
#603F9C
oklch(45.4% 0.145 296.5)
-
Step 900
900
#493176
oklch(37.8% 0.114 296.6)
-
Step 950
950
#2A1D45
oklch(26.9% 0.073 296.2)
#603F9C 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) | #07539F | 0.103 |
| Deuteranopia (no green cones) | #19519A | 0.096 |
| Tritanopia (no blue cones) | #525367 | 0.114 |
| Achromatopsia (no color) | #525252 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #603F9C
#603F9C
oklch(45.4% 0.145 296.5)
- #535D00
#535D00
oklch(45.4% 0.104 116.8)
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 #603F9C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.027
- Blueberry #464196 ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.051
- Twilight #4E518B ΔE 0.062
- Bluey Purple #6241C7 ΔE 0.068
- Blue With A Hint Of Purple #533CC6 ΔE 0.072
- Dusk #4E5481 ΔE 0.080
- Blurple #5539CC ΔE 0.081
Use #603F9C 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.