#6570DA
Closest named color: Dark Periwinkle (#665FD1). oklch(58.9% 0.16 275.9), rgb(101, 112, 218).
Aa
Black text reads best on this color (4.88:1).
About this color
#6570DA is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.160 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.042 away. Black text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.88:1 |
| White text | 4.30:1 |
Values
| HEX | #6570DA |
| RGB | rgb(101, 112, 218) |
| HSL | hsl(234, 61%, 63%) |
| OKLCH | oklch(58.9% 0.16 275.9) |
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 #6570DA | 4.30:1 | AA large text | Lc -75.0 | Fine for body text |
| Black text on #6570DA | 4.88:1 | AA | Lc 34.6 | Non-text elements, placeholder text |
| #6570DA text on white | 4.30:1 | AA large text | Lc 69.5 | Content text, not long reading |
| #6570DA text on black | 4.88:1 | AA | Lc -32.1 | Non-text elements, placeholder text |
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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D1D8F4
oklch(88.6% 0.039 274.4)
-
Step 300
300
#B3BDF0
oklch(80.8% 0.073 276)
-
Step 400
400
#8D9AE8
oklch(70.7% 0.115 275.8)
-
Step 500
500
#727FE1
oklch(63.1% 0.147 275.7)
-
Step 600
600 (this color)
#6570DA
oklch(58.9% 0.16 275.9)
-
Step 700
700
#4C54B3
oklch(49.1% 0.149 275.8)
-
Step 800
800
#3E4591
oklch(42.6% 0.124 275.9)
-
Step 900
900
#343B74
oklch(37.7% 0.097 275.5)
-
Step 950
950
#1F2344
oklch(27.1% 0.061 276.3)
#6570DA 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) | #3D7FDE | 0.052 |
| Deuteranopia (no green cones) | #2E75D8 | 0.055 |
| Tritanopia (no blue cones) | #2C879B | 0.140 |
| Achromatopsia (no color) | #7A7A7A | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6570DA
#6570DA
oklch(58.9% 0.16 275.9)
- #937C00
#937C00
oklch(59% 0.121 96)
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 #6570DA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.042
- Medium Slate Blue #7B68EE ΔE 0.048
- Cornflower #6A79F7 ΔE 0.048
- Royal Blue #4169E1 ΔE 0.050
- Light Indigo #6D5ACF ΔE 0.054
- Slate Blue #6A5ACD ΔE 0.054
- Soft Blue #6488EA ΔE 0.062
- Iris #6258C4 ΔE 0.065
Use #6570DA 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.