#515BD3
Closest named color: Warm Blue (#4B57DB). oklch(53.1% 0.182 274.7), rgb(81, 91, 211).
Aa
White text reads best on this color (5.54:1).
About this color
#515BD3 is a medium-dark, vivid blue. In OKLCH its lightness is 53%, its chroma 0.182 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Warm Blue (#4B57DB), ΔE 0.018 away. White text reads best on it, at 5.54:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.182) |
| Temperature | cool |
| Nearest name | Warm Blue (#4B57DB) |
| Black text | 3.78:1 |
| White text | 5.54:1 |
Values
| HEX | #515BD3 |
| RGB | rgb(81, 91, 211) |
| HSL | hsl(235, 60%, 57%) |
| OKLCH | oklch(53.1% 0.182 274.7) |
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 #515BD3 | 5.54:1 | AA | Lc -82.6 | Fine for body text |
| Black text on #515BD3 | 3.78:1 | AA large text | Lc 26.8 | Dividers and decoration only |
| #515BD3 text on white | 5.54:1 | AA | Lc 77.3 | Fine for body text |
| #515BD3 text on black | 3.78:1 | AA large text | Lc -24.5 | 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
#E5E9FA
oklch(93.6% 0.023 275.4)
-
Step 200
200
#D0D8F8
oklch(88.6% 0.045 274.4)
-
Step 300
300
#B0BDF6
oklch(80.8% 0.082 274.5)
-
Step 400
400
#8999F2
oklch(70.8% 0.131 274.8)
-
Step 500
500
#6D7DED
oklch(63.1% 0.167 274.5)
-
Step 600
600 (this color)
#515BD3
oklch(53.1% 0.182 274.7)
-
Step 700
700
#4851BE
oklch(49.1% 0.169 274.7)
-
Step 800
800
#3B439A
oklch(42.7% 0.14 274.8)
-
Step 900
900
#323A7A
oklch(37.8% 0.108 274.7)
-
Step 950
950
#1D2248
oklch(27% 0.07 275)
#515BD3 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) | #006ED7 | 0.064 |
| Deuteranopia (no green cones) | #0063D1 | 0.057 |
| Tritanopia (no blue cones) | #00788E | 0.155 |
| Achromatopsia (no color) | #686868 | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #515BD3
#515BD3
oklch(53.1% 0.182 274.7)
- #806A00
#806A00
oklch(53% 0.109 94.6)
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 #515BD3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Warm Blue #4B57DB ΔE 0.018
- Dark Periwinkle #665FD1 ΔE 0.033
- Iris #6258C4 ΔE 0.033
- Slate Blue #6A5ACD ΔE 0.037
- Royal Blue #4169E1 ΔE 0.040
- Light Indigo #6D5ACF ΔE 0.041
- Neon Blue #4361EE ΔE 0.045
- Azul #1D5DEC ΔE 0.060
Use #515BD3 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.