#517FFF
Closest named color: Cornflower (#6A79F7). oklch(63.2% 0.197 266), rgb(81, 127, 255).
Aa
Black text reads best on this color (5.82:1).
About this color
#517FFF is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.197 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.031 away. Black text reads best on it, at 5.82:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.197) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.82:1 |
| White text | 3.60:1 |
Values
| HEX | #517FFF |
| RGB | rgb(81, 127, 255) |
| HSL | hsl(224, 100%, 66%) |
| OKLCH | oklch(63.2% 0.197 266) |
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 #517FFF | 3.60:1 | AA large text | Lc -68.7 | Content text, not long reading |
| Black text on #517FFF | 5.82:1 | AA | Lc 40.9 | Non-text elements, placeholder text |
| #517FFF text on white | 3.60:1 | AA large text | Lc 63.2 | Content text, not long reading |
| #517FFF text on black | 5.82:1 | AA | Lc -38.5 | 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
#F1F5FE
oklch(97% 0.013 266.7)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C9D9FE
oklch(88.5% 0.054 266.8)
-
Step 300
300
#A4C0FF
oklch(81% 0.095 265.8)
-
Step 400
400
#749CFF
oklch(70.8% 0.152 266)
-
Step 500
500 (this color)
#517FFF
oklch(63.2% 0.197 266)
-
Step 600
600
#3864EE
oklch(55.7% 0.213 266)
-
Step 700
700
#2B51CF
oklch(49% 0.199 266.1)
-
Step 800
800
#2444A7
oklch(42.7% 0.164 265.9)
-
Step 900
900
#213B85
oklch(37.8% 0.128 265.8)
-
Step 950
950
#13234E
oklch(27% 0.082 265.8)
#517FFF 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) | #318FFF | 0.043 |
| Deuteranopia (no green cones) | #007FFC | 0.043 |
| Tritanopia (no blue cones) | #009DB3 | 0.159 |
| Achromatopsia (no color) | #878787 | 0.197 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517FFF
#517FFF
oklch(63.2% 0.197 266)
- #AC8300
#AC8300
oklch(63.2% 0.129 86.4)
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 #517FFF, closest first.
No curated palette has a color within ΔE 0.04 of #517FFF.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.031
- Clear Blue #247AFD ΔE 0.038
- Soft Blue #6488EA ΔE 0.047
- Dodger Blue #1E90FF ΔE 0.048
- Dark Sky Blue #448EE4 ΔE 0.060
- Chefchaouen Blue #4895EF ΔE 0.064
- Cornflower Blue #6495ED ΔE 0.071
- Medium Slate Blue #7B68EE ΔE 0.072
Use #517FFF 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.