#1C75CF
Closest named color: Windows Blue (#3778BF). oklch(56.1% 0.16 253.4), rgb(28, 117, 207).
Aa
White text reads best on this color (4.67:1).
About this color
#1C75CF is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.160 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.032 away. White text reads best on it, at 4.67:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.160) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.49:1 |
| White text | 4.67:1 |
Values
| HEX | #1C75CF |
| RGB | rgb(28, 117, 207) |
| HSL | hsl(210, 76%, 46%) |
| OKLCH | oklch(56.1% 0.16 253.4) |
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 #1C75CF | 4.67:1 | AA | Lc -77.4 | Fine for body text |
| Black text on #1C75CF | 4.49:1 | AA large text | Lc 32.2 | Non-text elements, placeholder text |
| #1C75CF text on white | 4.67:1 | AA | Lc 71.9 | Content text, not long reading |
| #1C75CF text on black | 4.49:1 | AA large text | Lc -29.8 | 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
#F1F6FC
oklch(97.1% 0.01 252.8)
-
Step 100
100
#E0EBF8
oklch(93.6% 0.021 252.5)
-
Step 200
200
#C7DBF4
oklch(88.4% 0.041 254)
-
Step 300
300
#A0C4EF
oklch(80.9% 0.072 253.1)
-
Step 400
400
#6BA4E7
oklch(70.7% 0.116 253.3)
-
Step 500
500
#408BE0
oklch(63% 0.148 253.6)
-
Step 600
600 (this color)
#1C75CF
oklch(56.1% 0.16 253.4)
-
Step 700
700
#0860B2
oklch(49% 0.15 253.6)
-
Step 800
800
#0E4F90
oklch(42.7% 0.124 253.4)
-
Step 900
900
#164273
oklch(37.7% 0.097 253.8)
-
Step 950
950
#0E2743
oklch(26.9% 0.061 253.2)
#1C75CF 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) | #467CD2 | 0.038 |
| Deuteranopia (no green cones) | #216DCD | 0.021 |
| Tritanopia (no blue cones) | #008B98 | 0.119 |
| Achromatopsia (no color) | #747474 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1C75CF
#1C75CF
oklch(56.1% 0.16 253.4)
- #9E6800
#9E6800
oklch(56.1% 0.119 73.6)
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 #1C75CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.032
- Royal Blue #4169E1 ΔE 0.048
- Mid Blue #276AB3 ΔE 0.049
- Water Blue #0E87CC ΔE 0.051
- Cerulean Blue #056EEE ΔE 0.053
- Nice Blue #107AB0 ΔE 0.054
- French Blue #436BAD ΔE 0.058
- Flat Blue #3C73A8 ΔE 0.062
Use #1C75CF 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.