#507CD3
Closest named color: Windows Blue (#3778BF). oklch(59.7% 0.142 262.6), rgb(80, 124, 211).
Aa
Black text reads best on this color (5.16:1).
About this color
#507CD3 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.142 and its hue 263°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.041 away. Black text reads best on it, at 5.16:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.16:1 |
| White text | 4.06:1 |
Values
| HEX | #507CD3 |
| RGB | rgb(80, 124, 211) |
| HSL | hsl(220, 60%, 57%) |
| OKLCH | oklch(59.7% 0.142 262.6) |
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 #507CD3 | 4.06:1 | AA large text | Lc -73.1 | Content text, not long reading |
| Black text on #507CD3 | 5.16:1 | AA | Lc 36.4 | Non-text elements, placeholder text |
| #507CD3 text on white | 4.06:1 | AA large text | Lc 67.6 | Content text, not long reading |
| #507CD3 text on black | 5.16:1 | AA | Lc -34.0 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#A9C1EE
oklch(80.8% 0.069 262.9)
-
Step 400
400
#7BA0E6
oklch(70.7% 0.111 262.5)
-
Step 500
500 (this color)
#507CD3
oklch(59.7% 0.142 262.6)
-
Step 600
600
#406ECC
oklch(55.5% 0.154 262.8)
-
Step 700
700
#325CB1
oklch(49.1% 0.143 262.6)
-
Step 800
800
#2A4B8F
oklch(42.6% 0.119 262.9)
-
Step 900
900
#264072
oklch(37.8% 0.092 262.2)
-
Step 950
950
#172643
oklch(27.2% 0.058 262.5)
#507CD3 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) | #5584D6 | 0.023 |
| Deuteranopia (no green cones) | #4278D1 | 0.019 |
| Tritanopia (no blue cones) | #00909D | 0.121 |
| Achromatopsia (no color) | #7E7E7E | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #507CD3
#507CD3
oklch(59.7% 0.142 262.6)
- #A37700
#A37700
oklch(59.7% 0.123 82.6)
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 #507CD3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.041
- Water Blue #0E87CC ΔE 0.049
- Dark Sky Blue #448EE4 ΔE 0.050
- Soft Blue #6488EA ΔE 0.052
- Cool Blue #4984B8 ΔE 0.052
- Steel Blue #4682B4 ΔE 0.056
- Royal Blue #4169E1 ΔE 0.060
- Cornflower #6A79F7 ΔE 0.065
Use #507CD3 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.