#517BE8
Closest named color: Cornflower (#6A79F7). oklch(60.8% 0.171 265.7), rgb(81, 123, 232).
Aa
Black text reads best on this color (5.34:1).
About this color
#517BE8 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.171 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.038 away. Black text reads best on it, at 5.34:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.34:1 |
| White text | 3.92:1 |
Values
| HEX | #517BE8 |
| RGB | rgb(81, 123, 232) |
| HSL | hsl(223, 77%, 61%) |
| OKLCH | oklch(60.8% 0.171 265.7) |
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 #517BE8 | 3.92:1 | AA large text | Lc -71.9 | Content text, not long reading |
| Black text on #517BE8 | 5.34:1 | AA | Lc 37.7 | Non-text elements, placeholder text |
| #517BE8 text on white | 3.92:1 | AA large text | Lc 66.4 | Content text, not long reading |
| #517BE8 text on black | 5.34:1 | AA | Lc -35.3 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CBD9F9
oklch(88.5% 0.047 266.7)
-
Step 300
300
#A7C0F8
oklch(80.9% 0.084 265.9)
-
Step 400
400
#799DF4
oklch(70.7% 0.134 266)
-
Step 500
500 (this color)
#517BE8
oklch(60.8% 0.171 265.7)
-
Step 600
600
#3E69DE
oklch(55.6% 0.185 265.5)
-
Step 700
700
#3156C1
oklch(49% 0.173 265.8)
-
Step 800
800
#29479C
oklch(42.7% 0.143 265.9)
-
Step 900
900
#253D7C
oklch(37.8% 0.111 265.7)
-
Step 950
950
#162449
oklch(27% 0.071 266.2)
#517BE8 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) | #4388EC | 0.033 |
| Deuteranopia (no green cones) | #237AE6 | 0.036 |
| Tritanopia (no blue cones) | #0094A6 | 0.142 |
| Achromatopsia (no color) | #808080 | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517BE8
#517BE8
oklch(60.8% 0.171 265.7)
- #A47C00
#A47C00
oklch(60.9% 0.125 85.8)
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 #517BE8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.038
- Soft Blue #6488EA ΔE 0.042
- Clear Blue #247AFD ΔE 0.045
- Dark Sky Blue #448EE4 ΔE 0.051
- Royal Blue #4169E1 ΔE 0.051
- Dodger Blue #1E90FF ΔE 0.062
- Cerulean Blue #056EEE ΔE 0.063
- Chefchaouen Blue #4895EF ΔE 0.067
Use #517BE8 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.