#517BE5
Closest named color: Cornflower (#6A79F7). oklch(60.6% 0.167 265.5), rgb(81, 123, 229).
Aa
Black text reads best on this color (5.31:1).
About this color
#517BE5 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.167 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.041 away. Black text reads best on it, at 5.31:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.31:1 |
| White text | 3.95:1 |
Values
| HEX | #517BE5 |
| RGB | rgb(81, 123, 229) |
| HSL | hsl(223, 74%, 61%) |
| OKLCH | oklch(60.6% 0.167 265.5) |
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 #517BE5 | 3.95:1 | AA large text | Lc -72.1 | Content text, not long reading |
| Black text on #517BE5 | 5.31:1 | AA | Lc 37.5 | Non-text elements, placeholder text |
| #517BE5 text on white | 3.95:1 | AA large text | Lc 66.6 | Content text, not long reading |
| #517BE5 text on black | 5.31:1 | AA | Lc -35.1 | 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
#E2EAFA
oklch(93.6% 0.023 264.5)
-
Step 200
200
#CBD9F8
oklch(88.5% 0.045 266.2)
-
Step 300
300
#A7C0F6
oklch(80.8% 0.082 265.3)
-
Step 400
400
#799EF2
oklch(70.8% 0.13 265.2)
-
Step 500
500 (this color)
#517BE5
oklch(60.6% 0.167 265.5)
-
Step 600
600
#3F69DC
oklch(55.5% 0.182 265.6)
-
Step 700
700
#3157BF
oklch(49.1% 0.169 265.4)
-
Step 800
800
#29489A
oklch(42.7% 0.139 265.3)
-
Step 900
900
#253D7B
oklch(37.7% 0.11 265.5)
-
Step 950
950
#162448
oklch(26.9% 0.07 265.9)
#517BE5 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) | #4687E9 | 0.031 |
| Deuteranopia (no green cones) | #297AE3 | 0.033 |
| Tritanopia (no blue cones) | #0093A5 | 0.138 |
| Achromatopsia (no color) | #808080 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517BE5
#517BE5
oklch(60.6% 0.167 265.5)
- #A37B00
#A37B00
oklch(60.6% 0.124 85.7)
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 #517BE5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.041
- Soft Blue #6488EA ΔE 0.043
- Clear Blue #247AFD ΔE 0.048
- Dark Sky Blue #448EE4 ΔE 0.050
- Royal Blue #4169E1 ΔE 0.051
- Cerulean Blue #056EEE ΔE 0.064
- Dodger Blue #1E90FF ΔE 0.064
- Windows Blue #3778BF ΔE 0.065
Use #517BE5 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.