#5B78CA
Closest named color: Windows Blue (#3778BF). oklch(58.9% 0.13 267.6), rgb(91, 120, 202).
Aa
Black text reads best on this color (4.98:1).
About this color
#5B78CA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.130 and its hue 268°. 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 4.98:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.98:1 |
| White text | 4.21:1 |
Values
| HEX | #5B78CA |
| RGB | rgb(91, 120, 202) |
| HSL | hsl(224, 51%, 57%) |
| OKLCH | oklch(58.9% 0.13 267.6) |
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 #5B78CA | 4.21:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #5B78CA | 4.98:1 | AA | Lc 35.2 | Non-text elements, placeholder text |
| #5B78CA text on white | 4.21:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #5B78CA text on black | 4.98:1 | AA | Lc -32.8 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D0D9EF
oklch(88.5% 0.032 268)
-
Step 300
300
#B0C0E7
oklch(80.9% 0.058 267.6)
-
Step 400
400
#879FDC
oklch(70.8% 0.094 267.5)
-
Step 500
500
#6A86D2
oklch(63.2% 0.119 267.6)
-
Step 600
600 (this color)
#5B78CA
oklch(58.9% 0.13 267.6)
-
Step 700
700
#435CA5
oklch(49.2% 0.121 267.6)
-
Step 800
800
#374B86
oklch(42.7% 0.101 267.9)
-
Step 900
900
#2F3F6B
oklch(37.6% 0.078 267.5)
-
Step 950
950
#1C253F
oklch(27% 0.05 268.4)
#5B78CA 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) | #5681CD | 0.024 |
| Deuteranopia (no green cones) | #4877C8 | 0.022 |
| Tritanopia (no blue cones) | #1C8A97 | 0.117 |
| Achromatopsia (no color) | #7B7B7B | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5B78CA
#5B78CA
oklch(58.9% 0.13 267.6)
- #9B7700
#9B7700
oklch(58.8% 0.12 87.4)
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 #5B78CA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.041
- Cool Blue #4984B8 ΔE 0.051
- Steel Blue #4682B4 ΔE 0.053
- Water Blue #0E87CC ΔE 0.060
- Soft Blue #6488EA ΔE 0.061
- Off Blue #5684AE ΔE 0.061
- French Blue #436BAD ΔE 0.063
- Dark Sky Blue #448EE4 ΔE 0.064
Use #5B78CA 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.