#665EBF
Closest named color: Iris (#6258C4). oklch(53.8% 0.147 284), rgb(102, 94, 191).
Aa
White text reads best on this color (5.35:1).
About this color
#665EBF is a medium-dark, vivid purple. In OKLCH its lightness is 54%, its chroma 0.147 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.019 away. White text reads best on it, at 5.35:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.91:1 |
| White text | 5.35:1 |
Values
| HEX | #665EBF |
| RGB | rgb(102, 94, 191) |
| HSL | hsl(245, 43%, 56%) |
| OKLCH | oklch(53.8% 0.147 284) |
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 #665EBF | 5.35:1 | AA | Lc -81.8 | Fine for body text |
| Black text on #665EBF | 3.91:1 | AA large text | Lc 27.6 | Dividers and decoration only |
| #665EBF text on white | 5.35:1 | AA | Lc 76.5 | Fine for body text |
| #665EBF text on black | 3.91:1 | AA large text | Lc -25.3 | 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 600.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E8E8F7
oklch(93.5% 0.02 286)
-
Step 200
200
#D5D6F1
oklch(88.4% 0.037 283.9)
-
Step 300
300
#BBBCEB
oklch(81% 0.066 283.9)
-
Step 400
400
#9897E0
oklch(70.6% 0.106 284)
-
Step 500
500
#817CD8
oklch(63.1% 0.136 284.3)
-
Step 600
600 (this color)
#665EBF
oklch(53.8% 0.147 284)
-
Step 700
700
#5952AA
oklch(49.1% 0.136 283.8)
-
Step 800
800
#49448A
oklch(42.8% 0.113 283.8)
-
Step 900
900
#3D3A6E
oklch(37.8% 0.087 284)
-
Step 950
950
#232241
oklch(27% 0.057 283.4)
#665EBF 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) | #326EC2 | 0.067 |
| Deuteranopia (no green cones) | #2D68BD | 0.068 |
| Tritanopia (no blue cones) | #487385 | 0.126 |
| Achromatopsia (no color) | #6B6B6B | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665EBF
#665EBF
oklch(53.8% 0.147 284)
- #797000
#797000
oklch(53.6% 0.113 104)
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 #665EBF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.019
- Slate Blue #6A5ACD ΔE 0.025
- Dark Periwinkle #665FD1 ΔE 0.028
- Light Indigo #6D5ACF ΔE 0.029
- Warm Blue #4B57DB ΔE 0.062
- French Blue #436BAD ΔE 0.064
- Deep Lavender #8D5EB7 ΔE 0.066
- Bluey Purple #6241C7 ΔE 0.069
Use #665EBF 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.