#515BCC
Closest named color: Warm Blue (#4B57DB). oklch(52.6% 0.173 275), rgb(81, 91, 204).
Aa
White text reads best on this color (5.64:1).
About this color
#515BCC is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.173 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.027 away. White text reads best on it, at 5.64:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.173) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.71:1 |
| White text | 5.64:1 |
Values
| HEX | #515BCC |
| RGB | rgb(81, 91, 204) |
| HSL | hsl(235, 55%, 56%) |
| OKLCH | oklch(52.6% 0.173 275) |
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 #515BCC | 5.64:1 | AA | Lc -83.2 | Fine for body text |
| Black text on #515BCC | 3.71:1 | AA large text | Lc 26.2 | Dividers and decoration only |
| #515BCC text on white | 5.64:1 | AA | Lc 77.9 | Fine for body text |
| #515BCC text on black | 3.71:1 | AA large text | Lc -23.9 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9F9
oklch(93.6% 0.022 274.7)
-
Step 200
200
#D0D8F6
oklch(88.6% 0.042 273.7)
-
Step 300
300
#B1BDF3
oklch(80.8% 0.078 274.8)
-
Step 400
400
#8A99EE
oklch(70.6% 0.125 275.1)
-
Step 500
500
#6F7EE8
oklch(63.2% 0.159 274.9)
-
Step 600
600 (this color)
#515BCC
oklch(52.6% 0.173 275)
-
Step 700
700
#4952BA
oklch(49% 0.162 275)
-
Step 800
800
#3C4496
oklch(42.7% 0.133 275.1)
-
Step 900
900
#333A78
oklch(37.7% 0.105 275.3)
-
Step 950
950
#1D2346
oklch(27.1% 0.065 273.9)
#515BCC 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) | #006DD0 | 0.064 |
| Deuteranopia (no green cones) | #0062CA | 0.058 |
| Tritanopia (no blue cones) | #00768B | 0.149 |
| Achromatopsia (no color) | #676767 | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515BCC
#515BCC
oklch(52.6% 0.173 275)
- #7E6900
#7E6900
oklch(52.6% 0.108 95.2)
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 #515BCC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.027
- Iris #6258C4 ΔE 0.027
- Dark Periwinkle #665FD1 ΔE 0.034
- Slate Blue #6A5ACD ΔE 0.036
- Light Indigo #6D5ACF ΔE 0.041
- Royal Blue #4169E1 ΔE 0.046
- Neon Blue #4361EE ΔE 0.055
- Bluey Purple #6241C7 ΔE 0.059
Use #515BCC 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.