#5378B9
Closest named color: Windows Blue (#3778BF). oklch(57.4% 0.109 261.1), rgb(83, 120, 185).
Aa
Black text reads best on this color (4.75:1).
About this color
#5378B9 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.109 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.028 away. Black text reads best on it, at 4.75:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.75:1 |
| White text | 4.41:1 |
Values
| HEX | #5378B9 |
| RGB | rgb(83, 120, 185) |
| HSL | hsl(218, 42%, 53%) |
| OKLCH | oklch(57.4% 0.109 261.1) |
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 #5378B9 | 4.41:1 | AA large text | Lc -76.0 | Fine for body text |
| Black text on #5378B9 | 4.75:1 | AA | Lc 33.6 | Non-text elements, placeholder text |
| #5378B9 text on white | 4.41:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #5378B9 text on black | 4.75:1 | AA | Lc -31.2 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#CFDAEC
oklch(88.5% 0.028 260.3)
-
Step 300
300
#AFC2E1
oklch(81% 0.049 260.2)
-
Step 400
400
#85A1D2
oklch(70.6% 0.079 261.4)
-
Step 500
500
#6689C6
oklch(62.9% 0.101 261.1)
-
Step 600
600 (this color)
#5378B9
oklch(57.4% 0.109 261.1)
-
Step 700
700
#3F609A
oklch(49.2% 0.101 261)
-
Step 800
800
#344E7D
oklch(42.6% 0.085 261.5)
-
Step 900
900
#2D4164
oklch(37.6% 0.066 261.1)
-
Step 950
950
#1B263B
oklch(26.9% 0.042 262.7)
#5378B9 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) | #5E7DBC | 0.020 |
| Deuteranopia (no green cones) | #5174B8 | 0.012 |
| Tritanopia (no blue cones) | #158690 | 0.097 |
| Achromatopsia (no color) | #787878 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5378B9
#5378B9
oklch(57.4% 0.109 261.1)
- #99711B
#99711B
oklch(57.4% 0.109 81.4)
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 #5378B9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.028
- Steel Blue #4682B4 ΔE 0.033
- Cool Blue #4984B8 ΔE 0.035
- Flat Blue #3C73A8 ΔE 0.039
- Off Blue #5684AE ΔE 0.043
- French Blue #436BAD ΔE 0.045
- Dull Blue #49759C ΔE 0.047
- Stormy Blue #507B9C ΔE 0.049
Use #5378B9 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.