#5378D3
Closest named color: Windows Blue (#3778BF). oklch(59% 0.145 265.5), rgb(83, 120, 211).
Aa
Black text reads best on this color (4.99:1).
About this color
#5378D3 is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.145 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.043 away. Black text reads best on it, at 4.99:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.99:1 |
| White text | 4.20:1 |
Values
| HEX | #5378D3 |
| RGB | rgb(83, 120, 211) |
| HSL | hsl(223, 59%, 58%) |
| OKLCH | oklch(59% 0.145 265.5) |
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 #5378D3 | 4.20:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #5378D3 | 4.99:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #5378D3 text on white | 4.20:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #5378D3 text on black | 4.99:1 | AA | Lc -32.9 | 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 600.
-
Step 50
50
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CED9F2
oklch(88.5% 0.036 266.7)
-
Step 300
300
#ACC0EC
oklch(80.8% 0.066 265.8)
-
Step 400
400
#819FE2
oklch(70.7% 0.104 265.4)
-
Step 500
500
#6286DA
oklch(63.1% 0.133 265.3)
-
Step 600
600 (this color)
#5378D3
oklch(59% 0.145 265.5)
-
Step 700
700
#3B5BAD
oklch(49.1% 0.136 265.6)
-
Step 800
800
#314B8C
oklch(42.7% 0.112 265.5)
-
Step 900
900
#2B3F70
oklch(37.7% 0.088 265.7)
-
Step 950
950
#192541
oklch(26.9% 0.055 265.3)
#5378D3 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) | #4F82D6 | 0.026 |
| Deuteranopia (no green cones) | #3C76D1 | 0.024 |
| Tritanopia (no blue cones) | #008C9B | 0.125 |
| Achromatopsia (no color) | #7B7B7B | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5378D3
#5378D3
oklch(59% 0.145 265.5)
- #9D7600
#9D7600
oklch(58.8% 0.121 85.4)
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 #5378D3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.043
- Royal Blue #4169E1 ΔE 0.052
- Soft Blue #6488EA ΔE 0.057
- Water Blue #0E87CC ΔE 0.057
- Dark Sky Blue #448EE4 ΔE 0.059
- Cool Blue #4984B8 ΔE 0.059
- Steel Blue #4682B4 ΔE 0.062
- Cornflower #6A79F7 ΔE 0.062
Use #5378D3 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.