#3575C5
Closest named color: Windows Blue (#3778BF). oklch(56.1% 0.14 255.5), rgb(53, 117, 197).
Aa
White text reads best on this color (4.66:1).
About this color
#3575C5 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.140 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.014 away. White text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.140) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.50:1 |
| White text | 4.66:1 |
Values
| HEX | #3575C5 |
| RGB | rgb(53, 117, 197) |
| HSL | hsl(213, 58%, 49%) |
| OKLCH | oklch(56.1% 0.14 255.5) |
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 #3575C5 | 4.66:1 | AA | Lc -77.5 | Fine for body text |
| Black text on #3575C5 | 4.50:1 | AA | Lc 32.0 | Non-text elements, placeholder text |
| #3575C5 text on white | 4.66:1 | AA | Lc 72.1 | Content text, not long reading |
| #3575C5 text on black | 4.50:1 | AA | Lc -29.6 | Dividers and decoration only |
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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E2EBF6
oklch(93.7% 0.018 253.3)
-
Step 200
200
#CADBF1
oklch(88.6% 0.035 254.9)
-
Step 300
300
#A6C3EA
oklch(80.9% 0.064 255.9)
-
Step 400
400
#75A3DF
oklch(70.6% 0.102 255.4)
-
Step 500
500
#518BD6
oklch(63.1% 0.129 255.6)
-
Step 600
600 (this color)
#3575C5
oklch(56.1% 0.14 255.5)
-
Step 700
700
#2660A9
oklch(49% 0.131 255.9)
-
Step 800
800
#214F89
oklch(42.7% 0.109 255.7)
-
Step 900
900
#20426D
oklch(37.6% 0.084 255.3)
-
Step 950
950
#142740
oklch(27% 0.053 255.8)
#3575C5 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) | #4F7BC8 | 0.032 |
| Deuteranopia (no green cones) | #386EC3 | 0.019 |
| Tritanopia (no blue cones) | #008893 | 0.110 |
| Achromatopsia (no color) | #747474 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3575C5
#3575C5
oklch(56.1% 0.14 255.5)
- #9C6900
#9C6900
oklch(56.1% 0.118 75.5)
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 #3575C5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.014
- Mid Blue #276AB3 ΔE 0.042
- French Blue #436BAD ΔE 0.042
- Nice Blue #107AB0 ΔE 0.043
- Flat Blue #3C73A8 ΔE 0.045
- Water Blue #0E87CC ΔE 0.049
- Steel Blue #4682B4 ΔE 0.053
- Cool Blue #4984B8 ΔE 0.055
Use #3575C5 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.