#5F78CC
Closest named color: Windows Blue (#3778BF). oklch(59.2% 0.132 269.6), rgb(95, 120, 204).
Aa
Black text reads best on this color (5.04:1).
About this color
#5F78CC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.132 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.047 away. Black text reads best on it, at 5.04:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.04:1 |
| White text | 4.16:1 |
Values
| HEX | #5F78CC |
| RGB | rgb(95, 120, 204) |
| HSL | hsl(226, 52%, 59%) |
| OKLCH | oklch(59.2% 0.132 269.6) |
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 #5F78CC | 4.16:1 | AA large text | Lc -74.0 | Content text, not long reading |
| Black text on #5F78CC | 5.04:1 | AA | Lc 35.6 | Non-text elements, placeholder text |
| #5F78CC text on white | 4.16:1 | AA large text | Lc 68.5 | Content text, not long reading |
| #5F78CC text on black | 5.04:1 | AA | Lc -33.2 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D0D9F0
oklch(88.6% 0.033 268.7)
-
Step 300
300
#B1C0E8
oklch(81% 0.059 268.9)
-
Step 400
400
#899EDC
oklch(70.7% 0.094 269.5)
-
Step 500
500
#6C85D3
oklch(63.1% 0.121 269.3)
-
Step 600
600 (this color)
#5F78CC
oklch(59.2% 0.132 269.6)
-
Step 700
700
#455BA6
oklch(49.2% 0.123 269.2)
-
Step 800
800
#394A86
oklch(42.6% 0.102 269.8)
-
Step 900
900
#313F6B
oklch(37.8% 0.078 269.1)
-
Step 950
950
#1D253F
oklch(27.1% 0.05 269.9)
#5F78CC 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) | #5581CF | 0.025 |
| Deuteranopia (no green cones) | #4978CA | 0.025 |
| Tritanopia (no blue cones) | #288A98 | 0.118 |
| Achromatopsia (no color) | #7C7C7C | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5F78CC
#5F78CC
oklch(59.2% 0.132 269.6)
- #9A7900
#9A7900
oklch(59.1% 0.121 89.5)
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 #5F78CC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.047
- Cool Blue #4984B8 ΔE 0.055
- Steel Blue #4682B4 ΔE 0.057
- Soft Blue #6488EA ΔE 0.058
- Dark Sky Blue #448EE4 ΔE 0.064
- Water Blue #0E87CC ΔE 0.064
- Off Blue #5684AE ΔE 0.064
- Dark Periwinkle #665FD1 ΔE 0.065
Use #5F78CC 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.