#645DBB
Closest named color: Iris (#6258C4). oklch(53.2% 0.143 283.8), rgb(100, 93, 187).
Aa
White text reads best on this color (5.48:1).
About this color
#645DBB is a medium-dark, vivid purple. In OKLCH its lightness is 53%, its chroma 0.143 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.020 away. White text reads best on it, at 5.48:1.
| Hue family | Purples |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.82:1 |
| White text | 5.48:1 |
Values
| HEX | #645DBB |
| RGB | rgb(100, 93, 187) |
| HSL | hsl(244, 41%, 55%) |
| OKLCH | oklch(53.2% 0.143 283.8) |
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 #645DBB | 5.48:1 | AA | Lc -82.5 | Fine for body text |
| Black text on #645DBB | 3.82:1 | AA large text | Lc 26.9 | Dividers and decoration only |
| #645DBB text on white | 5.48:1 | AA | Lc 77.2 | Fine for body text |
| #645DBB text on black | 3.82:1 | AA large text | Lc -24.6 | 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
#D5D7F1
oklch(88.6% 0.036 282.1)
-
Step 300
300
#BBBCEA
oklch(81% 0.065 283.9)
-
Step 400
400
#9898DF
oklch(70.7% 0.103 283.5)
-
Step 500
500
#807DD6
oklch(63.1% 0.132 283.5)
-
Step 600
600 (this color)
#645DBB
oklch(53.2% 0.143 283.8)
-
Step 700
700
#5953A8
oklch(49.1% 0.132 283.6)
-
Step 800
800
#494488
oklch(42.7% 0.11 284.1)
-
Step 900
900
#3D3A6D
oklch(37.7% 0.085 284.2)
-
Step 950
950
#232240
oklch(26.9% 0.055 283.6)
#645DBB 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) | #336CBE | 0.064 |
| Deuteranopia (no green cones) | #2E66B9 | 0.065 |
| Tritanopia (no blue cones) | #477183 | 0.122 |
| Achromatopsia (no color) | #696969 | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645DBB
#645DBB
oklch(53.2% 0.143 283.8)
- #786F00
#786F00
oklch(53.3% 0.113 103.9)
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 #645DBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.020
- Slate Blue #6A5ACD ΔE 0.031
- Dark Periwinkle #665FD1 ΔE 0.034
- Light Indigo #6D5ACF ΔE 0.035
- French Blue #436BAD ΔE 0.060
- Warm Blue #4B57DB ΔE 0.064
- Bluey Purple #6241C7 ΔE 0.068
- Deep Lavender #8D5EB7 ΔE 0.068
Use #645DBB 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.