#5F75CF
Closest named color: Windows Blue (#3778BF). oklch(58.8% 0.14 271.2), rgb(95, 117, 207).
Aa
Black text reads best on this color (4.93:1).
About this color
#5F75CF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.140 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.050 away. Black text reads best on it, at 4.93:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.140) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.93:1 |
| White text | 4.25:1 |
Values
| HEX | #5F75CF |
| RGB | rgb(95, 117, 207) |
| HSL | hsl(228, 54%, 59%) |
| OKLCH | oklch(58.8% 0.14 271.2) |
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 #5F75CF | 4.25:1 | AA large text | Lc -74.7 | Content text, not long reading |
| Black text on #5F75CF | 4.93:1 | AA | Lc 34.8 | Non-text elements, placeholder text |
| #5F75CF text on white | 4.25:1 | AA large text | Lc 69.2 | Content text, not long reading |
| #5F75CF text on black | 4.93:1 | AA | Lc -32.4 | 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
#E5E9F6
oklch(93.5% 0.018 272.3)
-
Step 200
200
#D0D8F1
oklch(88.4% 0.035 271.5)
-
Step 300
300
#B1BFEA
oklch(80.8% 0.063 270.8)
-
Step 400
400
#8A9DE0
oklch(70.7% 0.101 271.5)
-
Step 500
500
#6D83D7
oklch(63% 0.129 271.2)
-
Step 600
600 (this color)
#5F75CF
oklch(58.8% 0.14 271.2)
-
Step 700
700
#4759AA
oklch(49.1% 0.131 271.4)
-
Step 800
800
#3A4989
oklch(42.6% 0.107 271.3)
-
Step 900
900
#323E6E
oklch(37.8% 0.083 271.3)
-
Step 950
950
#1D2440
oklch(26.9% 0.053 271.8)
#5F75CF 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) | #4E80D2 | 0.032 |
| Deuteranopia (no green cones) | #4176CD | 0.033 |
| Tritanopia (no blue cones) | #258998 | 0.125 |
| Achromatopsia (no color) | #7B7B7B | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5F75CF
#5F75CF
oklch(58.8% 0.14 271.2)
- #977900
#977900
oklch(58.8% 0.12 91.4)
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 #5F75CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.050
- Dark Periwinkle #665FD1 ΔE 0.055
- Royal Blue #4169E1 ΔE 0.058
- Soft Blue #6488EA ΔE 0.060
- Cornflower #6A79F7 ΔE 0.063
- Cool Blue #4984B8 ΔE 0.064
- Steel Blue #4682B4 ΔE 0.066
- Slate Blue #6A5ACD ΔE 0.067
Use #5F75CF 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.