#5A78BB
Closest named color: Windows Blue (#3778BF). oklch(58% 0.109 264.9), rgb(90, 120, 187).
Aa
Black text reads best on this color (4.83:1).
About this color
#5A78BB is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.109 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.035 away. Black text reads best on it, at 4.83:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.83:1 |
| White text | 4.33:1 |
Values
| HEX | #5A78BB |
| RGB | rgb(90, 120, 187) |
| HSL | hsl(221, 42%, 54%) |
| OKLCH | oklch(58% 0.109 264.9) |
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 #5A78BB | 4.33:1 | AA large text | Lc -75.4 | Fine for body text |
| Black text on #5A78BB | 4.83:1 | AA | Lc 34.1 | Non-text elements, placeholder text |
| #5A78BB text on white | 4.33:1 | AA large text | Lc 69.9 | Content text, not long reading |
| #5A78BB text on black | 4.83:1 | AA | Lc -31.7 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E5EAF4
oklch(93.6% 0.015 264.5)
-
Step 200
200
#D0D9EC
oklch(88.4% 0.028 265.4)
-
Step 300
300
#B1C1E1
oklch(80.9% 0.049 264.3)
-
Step 400
400
#89A0D2
oklch(70.7% 0.078 265.3)
-
Step 500
500
#6B88C7
oklch(63.1% 0.101 264.8)
-
Step 600
600 (this color)
#5A78BB
oklch(58% 0.109 264.9)
-
Step 700
700
#445E9A
oklch(49% 0.102 265.2)
-
Step 800
800
#384D7D
oklch(42.6% 0.084 265.1)
-
Step 900
900
#304165
oklch(37.8% 0.066 264.2)
-
Step 950
950
#1C263B
oklch(27% 0.042 264.3)
#5A78BB 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) | #5E7EBE | 0.018 |
| Deuteranopia (no green cones) | #5375BA | 0.013 |
| Tritanopia (no blue cones) | #2C8691 | 0.097 |
| Achromatopsia (no color) | #797979 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5A78BB
#5A78BB
oklch(58% 0.109 264.9)
- #98741B
#98741B
oklch(57.9% 0.11 84.7)
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 #5A78BB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.035
- Steel Blue #4682B4 ΔE 0.037
- Cool Blue #4984B8 ΔE 0.037
- Off Blue #5684AE ΔE 0.044
- Flat Blue #3C73A8 ΔE 0.047
- Dusty Blue #5A86AD ΔE 0.050
- French Blue #436BAD ΔE 0.051
- Dull Blue #49759C ΔE 0.054
Use #5A78BB 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.