#517BF1
Closest named color: Cornflower (#6A79F7). oklch(61.4% 0.183 266.3), rgb(81, 123, 241).
Aa
Black text reads best on this color (5.45:1).
About this color
#517BF1 is a medium-dark, vivid blue. In OKLCH its lightness is 61%, its chroma 0.183 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Cornflower (#6A79F7), ΔE 0.030 away. Black text reads best on it, at 5.45:1.
| Hue family | Blues |
| Lightness | medium-dark (61%) |
| Chroma | vivid (0.183) |
| Temperature | cool |
| Nearest name | Cornflower (#6A79F7) |
| Black text | 5.45:1 |
| White text | 3.85:1 |
Values
| HEX | #517BF1 |
| RGB | rgb(81, 123, 241) |
| HSL | hsl(224, 85%, 63%) |
| OKLCH | oklch(61.4% 0.183 266.3) |
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 #517BF1 | 3.85:1 | AA large text | Lc -71.1 | Content text, not long reading |
| Black text on #517BF1 | 5.45:1 | AA | Lc 38.4 | Non-text elements, placeholder text |
| #517BF1 text on white | 3.85:1 | AA large text | Lc 65.6 | Content text, not long reading |
| #517BF1 text on black | 5.45:1 | AA | Lc -36.0 | 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
#779CFA
oklch(70.7% 0.144 266.5)
-
Step 500
500 (this color)
#517BF1
oklch(61.4% 0.183 266.3)
-
Step 600
600
#3D66E6
oklch(55.6% 0.2 266.4)
-
Step 700
700
#3054C8
oklch(49.2% 0.185 266.4)
-
Step 800
800
#2845A1
oklch(42.6% 0.153 266.5)
-
Step 900
900
#243C80
oklch(37.8% 0.119 266.2)
-
Step 950
950
#15234B
oklch(26.9% 0.076 266.7)
#517BF1 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) | #398AF5 | 0.039 |
| Deuteranopia (no green cones) | #017BEF | 0.044 |
| Tritanopia (no blue cones) | #0097AB | 0.151 |
| Achromatopsia (no color) | #828282 | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517BF1
#517BF1
oklch(61.4% 0.183 266.3)
- #A67E00
#A67E00
oklch(61.5% 0.126 86.2)
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 #517BF1, closest first.
No curated palette has a color within ΔE 0.04 of #517BF1.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cornflower #6A79F7 ΔE 0.030
- Clear Blue #247AFD ΔE 0.038
- Soft Blue #6488EA ΔE 0.044
- Royal Blue #4169E1 ΔE 0.055
- Dark Sky Blue #448EE4 ΔE 0.056
- Dodger Blue #1E90FF ΔE 0.057
- Cerulean Blue #056EEE ΔE 0.062
- Medium Slate Blue #7B68EE ΔE 0.064
Use #517BF1 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.