#517AEE
Closest named color: Cornflower (#6A79F7). oklch(61% 0.18 266.5), rgb(81, 122, 238).
Aa
Black text reads best on this color (5.36:1).
About this color
#517AEE is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.180 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.032 away. Black text reads best on it, at 5.36:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.180) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.36:1 |
| White text | 3.91:1 |
Values
| HEX | #517AEE |
| RGB | rgb(81, 122, 238) |
| HSL | hsl(224, 82%, 63%) |
| OKLCH | oklch(61% 0.18 266.5) |
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 #517AEE | 3.91:1 | AA large text | Lc -71.7 | Content text, not long reading |
| Black text on #517AEE | 5.36:1 | AA | Lc 37.9 | Non-text elements, placeholder text |
| #517AEE text on white | 3.91:1 | AA large text | Lc 66.2 | Content text, not long reading |
| #517AEE text on black | 5.36:1 | AA | Lc -35.5 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E2EAFC
oklch(93.6% 0.026 266.6)
-
Step 200
200
#CAD9FB
oklch(88.5% 0.05 266.5)
-
Step 300
300
#A6C0FB
oklch(81% 0.089 266)
-
Step 400
400
#789CF8
oklch(70.6% 0.141 266.7)
-
Step 500
500 (this color)
#517AEE
oklch(61% 0.18 266.5)
-
Step 600
600
#3E66E4
oklch(55.5% 0.197 266.5)
-
Step 700
700
#3154C6
oklch(49.1% 0.182 266.5)
-
Step 800
800
#2946A0
oklch(42.8% 0.15 266.5)
-
Step 900
900
#253C7F
oklch(37.8% 0.117 266.5)
-
Step 950
950
#15244A
oklch(27% 0.073 265.6)
#517AEE 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) | #3A88F2 | 0.037 |
| Deuteranopia (no green cones) | #097AEC | 0.044 |
| Tritanopia (no blue cones) | #0095A9 | 0.148 |
| Achromatopsia (no color) | #818181 | 0.181 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517AEE
#517AEE
oklch(61% 0.18 266.5)
- #A47D00
#A47D00
oklch(61.1% 0.125 86.6)
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 #517AEE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.032
- Clear Blue #247AFD ΔE 0.039
- Soft Blue #6488EA ΔE 0.045
- Royal Blue #4169E1 ΔE 0.051
- Dark Sky Blue #448EE4 ΔE 0.056
- Cerulean Blue #056EEE ΔE 0.060
- Dodger Blue #1E90FF ΔE 0.061
- Medium Slate Blue #7B68EE ΔE 0.064
Use #517AEE 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.