#505CB5
Closest named color: Iris (#6258C4). oklch(51.1% 0.14 274.6), rgb(80, 92, 181).
Aa
White text reads best on this color (5.93:1).
About this color
#505CB5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.140 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.037 away. White text reads best on it, at 5.93:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.140) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.53:1 |
| White text | 5.93:1 |
Values
| HEX | #505CB5 |
| RGB | rgb(80, 92, 181) |
| HSL | hsl(233, 41%, 51%) |
| OKLCH | oklch(51.1% 0.14 274.6) |
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 #505CB5 | 5.93:1 | AA | Lc -84.7 | Fine for body text |
| Black text on #505CB5 | 3.53:1 | AA large text | Lc 24.6 | Dividers and decoration only |
| #505CB5 text on white | 5.93:1 | AA | Lc 79.4 | Fine for body text |
| #505CB5 text on black | 3.53:1 | AA large text | Lc -22.4 | 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 700.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D1D8F3
oklch(88.5% 0.038 274.1)
-
Step 300
300
#B3BEED
oklch(80.9% 0.068 274.5)
-
Step 400
400
#8C9BE4
oklch(70.7% 0.108 274.4)
-
Step 500
500
#7181DC
oklch(63.2% 0.138 274.3)
-
Step 600
600
#5B68CA
oklch(55.6% 0.151 274.7)
-
Step 700
700 (this color)
#505CB5
oklch(51.1% 0.14 274.6)
-
Step 800
800
#3D478D
oklch(42.7% 0.115 274.4)
-
Step 900
900
#343C71
oklch(37.7% 0.091 274.8)
-
Step 950
950
#1E2442
oklch(27.1% 0.056 273.5)
#505CB5 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) | #3168B8 | 0.042 |
| Deuteranopia (no green cones) | #2260B3 | 0.046 |
| Tritanopia (no blue cones) | #197080 | 0.124 |
| Achromatopsia (no color) | #646464 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #505CB5
#505CB5
oklch(51.1% 0.14 274.6)
- #7A6500
#7A6500
oklch(51.2% 0.105 94.7)
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 #505CB5, closest first.
No curated palette has a color within ΔE 0.04 of #505CB5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.037
- French Blue #436BAD ΔE 0.046
- Mid Blue #276AB3 ΔE 0.051
- Slate Blue #6A5ACD ΔE 0.054
- Dark Periwinkle #665FD1 ΔE 0.055
- Dusky Blue #475F94 ΔE 0.057
- Light Indigo #6D5ACF ΔE 0.060
- Warm Blue #4B57DB ΔE 0.062
Use #505CB5 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.