#665FBB
Closest named color: Iris (#6258C4). oklch(53.7% 0.14 284.1), rgb(102, 95, 187).
Aa
White text reads best on this color (5.35:1).
About this color
#665FBB is a medium-dark, moderately saturated purple. In OKLCH its lightness is 54%, its chroma 0.140 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.025 away. White text reads best on it, at 5.35:1.
| Hue family | Purples |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.140) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.91:1 |
| White text | 5.35:1 |
Values
| HEX | #665FBB |
| RGB | rgb(102, 95, 187) |
| HSL | hsl(245, 40%, 55%) |
| OKLCH | oklch(53.7% 0.14 284.1) |
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 #665FBB | 5.35:1 | AA | Lc -81.8 | Fine for body text |
| Black text on #665FBB | 3.91:1 | AA large text | Lc 27.6 | Dividers and decoration only |
| #665FBB text on white | 5.35:1 | AA | Lc 76.5 | Fine for body text |
| #665FBB text on black | 3.91:1 | AA large text | Lc -25.2 | 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
#E8E8F6
oklch(93.5% 0.019 286)
-
Step 200
200
#D6D7F0
oklch(88.6% 0.034 283.9)
-
Step 300
300
#BBBCE9
oklch(81% 0.063 283.9)
-
Step 400
400
#9998DD
oklch(70.7% 0.1 284.2)
-
Step 500
500
#817DD4
oklch(63.1% 0.129 284.2)
-
Step 600
600 (this color)
#665FBB
oklch(53.7% 0.14 284.1)
-
Step 700
700
#5A53A7
oklch(49.1% 0.13 284.3)
-
Step 800
800
#494487
oklch(42.6% 0.108 284.2)
-
Step 900
900
#3D3A6C
oklch(37.7% 0.084 284.3)
-
Step 950
950
#23223F
oklch(26.9% 0.053 283.8)
#665FBB 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) | #386EBE | 0.062 |
| Deuteranopia (no green cones) | #3468B9 | 0.062 |
| Tritanopia (no blue cones) | #4A7284 | 0.119 |
| Achromatopsia (no color) | #6B6B6B | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665FBB
#665FBB
oklch(53.7% 0.14 284.1)
- #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 #665FBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.025
- Slate Blue #6A5ACD ΔE 0.032
- Dark Periwinkle #665FD1 ΔE 0.034
- Light Indigo #6D5ACF ΔE 0.036
- French Blue #436BAD ΔE 0.059
- Deep Lavender #8D5EB7 ΔE 0.064
- Warm Blue #4B57DB ΔE 0.068
- Royal Blue #4169E1 ΔE 0.073
Use #665FBB 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.