#517FFB
Closest named color: Cornflower (#6A79F7). oklch(62.9% 0.192 265.8), rgb(81, 127, 251).
Aa
Black text reads best on this color (5.77:1).
About this color
#517FFB is a medium-light, vivid blue. In OKLCH its lightness is 63%, its chroma 0.192 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.029 away. Black text reads best on it, at 5.77:1.
| Hue family | Blues |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.192) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.77:1 |
| White text | 3.63:1 |
Values
| HEX | #517FFB |
| RGB | rgb(81, 127, 251) |
| HSL | hsl(224, 96%, 65%) |
| OKLCH | oklch(62.9% 0.192 265.8) |
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 #517FFB | 3.63:1 | AA large text | Lc -69.0 | Content text, not long reading |
| Black text on #517FFB | 5.77:1 | AA | Lc 40.5 | Non-text elements, placeholder text |
| #517FFB text on white | 3.63:1 | AA large text | Lc 63.5 | Content text, not long reading |
| #517FFB text on black | 5.77:1 | AA | Lc -38.1 | 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
#F1F5FE
oklch(97% 0.013 266.7)
-
Step 100
100
#E1EAFD
oklch(93.6% 0.028 265.4)
-
Step 200
200
#C9D9FD
oklch(88.5% 0.053 266.4)
-
Step 300
300
#A4C0FE
oklch(81% 0.093 265.6)
-
Step 400
400
#749CFE
oklch(70.7% 0.15 265.9)
-
Step 500
500 (this color)
#517FFB
oklch(62.9% 0.192 265.8)
-
Step 600
600
#3865EB
oklch(55.6% 0.208 265.7)
-
Step 700
700
#2C53CC
oklch(49.2% 0.193 265.8)
-
Step 800
800
#2445A5
oklch(42.8% 0.16 265.5)
-
Step 900
900
#213B83
oklch(37.7% 0.125 265.7)
-
Step 950
950
#14234D
oklch(27% 0.08 266.3)
#517FFB 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) | #378EFF | 0.039 |
| Deuteranopia (no green cones) | #007FF8 | 0.043 |
| Tritanopia (no blue cones) | #009CB1 | 0.156 |
| Achromatopsia (no color) | #868686 | 0.192 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517FFB
#517FFB
oklch(62.9% 0.192 265.8)
- #AB8200
#AB8200
oklch(62.9% 0.129 86.3)
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 #517FFB, closest first.
No curated palette has a color within ΔE 0.04 of #517FFB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.029
- Clear Blue #247AFD ΔE 0.038
- Soft Blue #6488EA ΔE 0.043
- Dodger Blue #1E90FF ΔE 0.048
- Dark Sky Blue #448EE4 ΔE 0.056
- Chefchaouen Blue #4895EF ΔE 0.062
- Cornflower Blue #6495ED ΔE 0.069
- Royal Blue #4169E1 ΔE 0.069
Use #517FFB 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.