#0175C4
Closest named color: Windows Blue (#3778BF). oklch(55% 0.15 248.6), rgb(1, 117, 196).
Aa
White text reads best on this color (4.83:1).
About this color
#0175C4 is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.150 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.028 away. White text reads best on it, at 4.83:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.150) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.34:1 |
| White text | 4.83:1 |
Values
| HEX | #0175C4 |
| RGB | rgb(1, 117, 196) |
| HSL | hsl(204, 99%, 39%) |
| OKLCH | oklch(55% 0.15 248.6) |
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 #0175C4 | 4.83:1 | AA | Lc -78.3 | Fine for body text |
| Black text on #0175C4 | 4.34:1 | AA large text | Lc 31.2 | Non-text elements, placeholder text |
| #0175C4 text on white | 4.83:1 | AA | Lc 72.8 | Content text, not long reading |
| #0175C4 text on black | 4.34:1 | AA large text | Lc -28.8 | 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
#F1F6FB
oklch(97.1% 0.009 247.9)
-
Step 100
100
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C7DCF1
oklch(88.5% 0.037 248.2)
-
Step 300
300
#9FC5EB
oklch(80.9% 0.068 248.7)
-
Step 400
400
#68A6E1
oklch(70.7% 0.108 248.4)
-
Step 500
500
#3A8ED8
oklch(63% 0.138 248.5)
-
Step 600
600 (this color)
#0175C4
oklch(55% 0.15 248.6)
-
Step 700
700
#0064A8
oklch(49.2% 0.133 248.3)
-
Step 800
800
#02518A
oklch(42.6% 0.115 248.6)
-
Step 900
900
#11446F
oklch(37.7% 0.09 248.7)
-
Step 950
950
#0C2841
oklch(27% 0.058 248.6)
#0175C4 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) | #4D7AC7 | 0.049 |
| Deuteranopia (no green cones) | #2E6BC2 | 0.029 |
| Tritanopia (no blue cones) | #008893 | 0.106 |
| Achromatopsia (no color) | #727272 | 0.150 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #0175C4
#0175C4
oklch(55% 0.15 248.6)
- #9E6200
#9E6200
oklch(55% 0.12 68.7)
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 #0175C4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.028
- Mid Blue #276AB3 ΔE 0.037
- Nice Blue #107AB0 ΔE 0.037
- Flat Blue #3C73A8 ΔE 0.049
- French Blue #436BAD ΔE 0.049
- Water Blue #0E87CC ΔE 0.051
- Muted Blue #3B719F ΔE 0.060
- Ocean Blue #03719C ΔE 0.063
Use #0175C4 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.