#6171CB
Closest named color: Dark Periwinkle (#665FD1). oklch(57.9% 0.139 273.7), rgb(97, 113, 203).
Aa
Black text reads best on this color (4.73:1).
About this color
#6171CB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.139 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.047 away. Black text reads best on it, at 4.73:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.139) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.73:1 |
| White text | 4.43:1 |
Values
| HEX | #6171CB |
| RGB | rgb(97, 113, 203) |
| HSL | hsl(231, 50%, 59%) |
| OKLCH | oklch(57.9% 0.139 273.7) |
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 #6171CB | 4.43:1 | AA large text | Lc -76.1 | Fine for body text |
| Black text on #6171CB | 4.73:1 | AA | Lc 33.5 | Non-text elements, placeholder text |
| #6171CB text on white | 4.43:1 | AA large text | Lc 70.6 | Content text, not long reading |
| #6171CB text on black | 4.73:1 | AA | Lc -31.1 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E6E9F6
oklch(93.6% 0.018 275.6)
-
Step 200
200
#D1D8F1
oklch(88.5% 0.035 273.2)
-
Step 300
300
#B3BEEA
oklch(80.8% 0.063 273.9)
-
Step 400
400
#8D9CDF
oklch(70.7% 0.1 273.9)
-
Step 500
500
#7182D6
oklch(63% 0.128 273.5)
-
Step 600
600 (this color)
#6171CB
oklch(57.9% 0.139 273.7)
-
Step 700
700
#4B58A9
oklch(49.1% 0.129 273.8)
-
Step 800
800
#3D4889
oklch(42.6% 0.108 273.7)
-
Step 900
900
#343D6D
oklch(37.7% 0.083 273.8)
-
Step 950
950
#1E2440
oklch(27% 0.053 273.2)
#6171CB 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) | #4B7CCE | 0.035 |
| Deuteranopia (no green cones) | #3F73C9 | 0.038 |
| Tritanopia (no blue cones) | #318494 | 0.122 |
| Achromatopsia (no color) | #787878 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6171CB
#6171CB
oklch(57.9% 0.139 273.7)
- #917800
#917800
oklch(57.9% 0.119 94.3)
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 #6171CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.047
- Windows Blue #3778BF ΔE 0.051
- Royal Blue #4169E1 ΔE 0.057
- Slate Blue #6A5ACD ΔE 0.057
- Light Indigo #6D5ACF ΔE 0.058
- French Blue #436BAD ΔE 0.062
- Iris #6258C4 ΔE 0.062
- Cool Blue #4984B8 ΔE 0.069
Use #6171CB 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.