#504ECB
Closest named color: Warm Blue (#4B57DB). oklch(50.1% 0.188 277.9), rgb(80, 78, 203).
Aa
White text reads best on this color (6.37:1).
About this color
#504ECB is a medium-dark, vivid blue. In OKLCH its lightness is 50%, its chroma 0.188 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.032 away. White text reads best on it, at 6.37:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.188) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.29:1 |
| White text | 6.37:1 |
Values
| HEX | #504ECB |
| RGB | rgb(80, 78, 203) |
| HSL | hsl(241, 55%, 55%) |
| OKLCH | oklch(50.1% 0.188 277.9) |
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 #504ECB | 6.37:1 | AA | Lc -86.3 | Fine for body text |
| Black text on #504ECB | 3.29:1 | AA large text | Lc 22.8 | Dividers and decoration only |
| #504ECB text on white | 6.37:1 | AA | Lc 81.2 | Fine for body text |
| #504ECB text on black | 3.29:1 | AA large text | Lc -20.6 | 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 700.
-
Step 50
50
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FC
oklch(93.7% 0.026 276.4)
-
Step 200
200
#D1D7FB
oklch(88.6% 0.05 277.9)
-
Step 300
300
#B2BBFB
oklch(80.8% 0.091 278)
-
Step 400
400
#8C96FA
oklch(70.8% 0.146 277.7)
-
Step 500
500
#7278F7
oklch(63.2% 0.186 277.6)
-
Step 600
600
#5D5CE6
oklch(55.6% 0.203 277.8)
-
Step 700
700 (this color)
#504ECB
oklch(50.1% 0.188 277.9)
-
Step 800
800
#3F3EA1
oklch(42.6% 0.156 277.9)
-
Step 900
900
#353680
oklch(37.6% 0.122 278.2)
-
Step 950
950
#1F214B
oklch(27.1% 0.076 278)
#504ECB 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) | #0064CF | 0.071 |
| Deuteranopia (no green cones) | #005AC9 | 0.063 |
| Tritanopia (no blue cones) | #006D85 | 0.160 |
| Achromatopsia (no color) | #5F5F5F | 0.189 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #504ECB
#504ECB
oklch(50.1% 0.188 277.9)
- #746300
#746300
oklch(50.1% 0.103 97.4)
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 #504ECB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.032
- Bluey Purple #6241C7 ΔE 0.037
- Blue With A Hint Of Purple #533CC6 ΔE 0.038
- Iris #6258C4 ΔE 0.040
- Blurple #5539CC ΔE 0.042
- Slate Blue #6A5ACD ΔE 0.052
- Dark Periwinkle #665FD1 ΔE 0.055
- Light Indigo #6D5ACF ΔE 0.056
Use #504ECB 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.