#517BEC
Closest named color: Cornflower (#6A79F7). oklch(61.1% 0.177 266), rgb(81, 123, 236).
Aa
Black text reads best on this color (5.39:1).
About this color
#517BEC is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.177 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.034 away. Black text reads best on it, at 5.39:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.177) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.39:1 |
| White text | 3.89:1 |
Values
| HEX | #517BEC |
| RGB | rgb(81, 123, 236) |
| HSL | hsl(224, 80%, 62%) |
| OKLCH | oklch(61.1% 0.177 266) |
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 #517BEC | 3.89:1 | AA large text | Lc -71.5 | Content text, not long reading |
| Black text on #517BEC | 5.39:1 | AA | Lc 38.0 | Non-text elements, placeholder text |
| #517BEC text on white | 3.89:1 | AA large text | Lc 66.0 | Content text, not long reading |
| #517BEC text on black | 5.39:1 | AA | Lc -35.6 | 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
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CAD9FA
oklch(88.5% 0.048 266)
-
Step 300
300
#A6C0F9
oklch(80.9% 0.086 265.5)
-
Step 400
400
#789DF7
oklch(70.8% 0.139 266)
-
Step 500
500 (this color)
#517BEC
oklch(61.1% 0.177 266)
-
Step 600
600
#3E68E2
oklch(55.7% 0.192 266)
-
Step 700
700
#3055C4
oklch(49% 0.179 265.9)
-
Step 800
800
#28469F
oklch(42.6% 0.149 266.1)
-
Step 900
900
#243C7E
oklch(37.6% 0.116 266)
-
Step 950
950
#15244A
oklch(27% 0.073 265.6)
#517BEC 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) | #3F89F0 | 0.036 |
| Deuteranopia (no green cones) | #197AEA | 0.040 |
| Tritanopia (no blue cones) | #0095A8 | 0.146 |
| Achromatopsia (no color) | #818181 | 0.177 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517BEC
#517BEC
oklch(61.1% 0.177 266)
- #A57D00
#A57D00
oklch(61.2% 0.125 86)
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 #517BEC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.034
- Clear Blue #247AFD ΔE 0.042
- Soft Blue #6488EA ΔE 0.043
- Royal Blue #4169E1 ΔE 0.052
- Dark Sky Blue #448EE4 ΔE 0.053
- Dodger Blue #1E90FF ΔE 0.060
- Cerulean Blue #056EEE ΔE 0.062
- Medium Slate Blue #7B68EE ΔE 0.065
Use #517BEC 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.