#665BBF
Closest named color: Iris (#6258C4). oklch(53.2% 0.151 285), rgb(102, 91, 191).
Aa
White text reads best on this color (5.50:1).
About this color
#665BBF is a medium-dark, vivid purple. In OKLCH its lightness is 53%, its chroma 0.151 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.013 away. White text reads best on it, at 5.50:1.
| Hue family | Purples |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.81:1 |
| White text | 5.50:1 |
Values
| HEX | #665BBF |
| RGB | rgb(102, 91, 191) |
| HSL | hsl(247, 44%, 55%) |
| OKLCH | oklch(53.2% 0.151 285) |
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 #665BBF | 5.50:1 | AA | Lc -82.6 | Fine for body text |
| Black text on #665BBF | 3.81:1 | AA large text | Lc 26.8 | Dividers and decoration only |
| #665BBF text on white | 5.50:1 | AA | Lc 77.3 | Fine for body text |
| #665BBF text on black | 3.81:1 | AA large text | Lc -24.5 | 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
#F5F5FC
oklch(97.2% 0.009 286.2)
-
Step 100
100
#E8E8F7
oklch(93.5% 0.02 286)
-
Step 200
200
#D6D6F2
oklch(88.5% 0.038 285.6)
-
Step 300
300
#BBBBEC
oklch(80.9% 0.069 284.8)
-
Step 400
400
#9A97E2
oklch(70.8% 0.109 285.1)
-
Step 500
500
#827BD9
oklch(63.1% 0.139 285.1)
-
Step 600
600 (this color)
#665BBF
oklch(53.2% 0.151 285)
-
Step 700
700
#5B51AC
oklch(49.2% 0.14 285)
-
Step 800
800
#4A438B
oklch(42.8% 0.116 284.8)
-
Step 900
900
#3D396F
oklch(37.7% 0.09 284.6)
-
Step 950
950
#242241
oklch(27.1% 0.057 284.9)
#665BBF 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) | #2A6CC2 | 0.074 |
| Deuteranopia (no green cones) | #2766BD | 0.073 |
| Tritanopia (no blue cones) | #487184 | 0.129 |
| Achromatopsia (no color) | #696969 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665BBF
#665BBF
oklch(53.2% 0.151 285)
- #776F00
#776F00
oklch(53.2% 0.113 104.6)
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 #665BBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.013
- Slate Blue #6A5ACD ΔE 0.023
- Light Indigo #6D5ACF ΔE 0.027
- Dark Periwinkle #665FD1 ΔE 0.029
- Warm Blue #4B57DB ΔE 0.060
- Bluey Purple #6241C7 ΔE 0.061
- Deep Lavender #8D5EB7 ΔE 0.068
- French Blue #436BAD ΔE 0.068
Use #665BBF 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.