#517DE4
Closest named color: Soft Blue (#6488EA). oklch(61% 0.163 264.6), rgb(81, 125, 228).
Aa
Black text reads best on this color (5.40:1).
About this color
#517DE4 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.163 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Soft Blue (#6488EA), ΔE 0.038 away. Black text reads best on it, at 5.40:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Soft Blue (#6488EA) |
| Black text | 5.40:1 |
| White text | 3.88:1 |
Values
| HEX | #517DE4 |
| RGB | rgb(81, 125, 228) |
| HSL | hsl(222, 73%, 61%) |
| OKLCH | oklch(61% 0.163 264.6) |
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 #517DE4 | 3.88:1 | AA large text | Lc -71.5 | Content text, not long reading |
| Black text on #517DE4 | 5.40:1 | AA | Lc 38.1 | Non-text elements, placeholder text |
| #517DE4 text on white | 3.88:1 | AA large text | Lc 66.0 | Content text, not long reading |
| #517DE4 text on black | 5.40:1 | AA | Lc -35.6 | 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 500.
-
Step 50
50
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CBD9F7
oklch(88.4% 0.044 265.6)
-
Step 300
300
#A7C0F5
oklch(80.8% 0.08 265)
-
Step 400
400
#799EF0
oklch(70.7% 0.128 264.9)
-
Step 500
500 (this color)
#517DE4
oklch(61% 0.163 264.6)
-
Step 600
600
#3D6BDA
oklch(55.7% 0.178 264.4)
-
Step 700
700
#3058BD
oklch(49.1% 0.166 264.7)
-
Step 800
800
#284999
oklch(42.8% 0.137 264.5)
-
Step 900
900
#243E79
oklch(37.7% 0.106 264.1)
-
Step 950
950
#162547
oklch(27.1% 0.066 264.5)
#517DE4 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) | #4B88E8 | 0.028 |
| Deuteranopia (no green cones) | #307BE2 | 0.030 |
| Tritanopia (no blue cones) | #0095A5 | 0.137 |
| Achromatopsia (no color) | #818181 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517DE4
#517DE4
oklch(61% 0.163 264.6)
- #A67C00
#A67C00
oklch(61.1% 0.125 84.7)
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 #517DE4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Soft Blue #6488EA ΔE 0.038
- Cornflower #6A79F7 ΔE 0.043
- Dark Sky Blue #448EE4 ΔE 0.045
- Clear Blue #247AFD ΔE 0.051
- Royal Blue #4169E1 ΔE 0.056
- Dodger Blue #1E90FF ΔE 0.061
- Chefchaouen Blue #4895EF ΔE 0.062
- Water Blue #0E87CC ΔE 0.063
Use #517DE4 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.