#1771CF
Closest named color: Windows Blue (#3778BF). oklch(55.1% 0.165 254.3), rgb(23, 113, 207).
Aa
White text reads best on this color (4.88:1).
About this color
#1771CF is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.165 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.039 away. White text reads best on it, at 4.88:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.165) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.29:1 |
| White text | 4.88:1 |
Values
| HEX | #1771CF |
| RGB | rgb(23, 113, 207) |
| HSL | hsl(211, 80%, 45%) |
| OKLCH | oklch(55.1% 0.165 254.3) |
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 #1771CF | 4.88:1 | AA | Lc -78.7 | Fine for body text |
| Black text on #1771CF | 4.29:1 | AA large text | Lc 30.8 | Non-text elements, placeholder text |
| #1771CF text on white | 4.88:1 | AA | Lc 73.3 | Content text, not long reading |
| #1771CF text on black | 4.29:1 | AA large text | Lc -28.4 | 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
#C7DBF5
oklch(88.5% 0.042 255)
-
Step 300
300
#A0C4F0
oklch(81% 0.074 253.7)
-
Step 400
400
#6BA3E9
oklch(70.6% 0.119 254.6)
-
Step 500
500
#408BE3
oklch(63.2% 0.152 254.3)
-
Step 600
600 (this color)
#1771CF
oklch(55.1% 0.165 254.3)
-
Step 700
700
#085FB5
oklch(49% 0.155 254.6)
-
Step 800
800
#0E4E92
oklch(42.6% 0.128 254.5)
-
Step 900
900
#154275
oklch(37.8% 0.1 254.2)
-
Step 950
950
#0E2744
oklch(27% 0.062 253.9)
#1771CF 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) | #3D79D3 | 0.035 |
| Deuteranopia (no green cones) | #0A6ACD | 0.020 |
| Tritanopia (no blue cones) | #008896 | 0.124 |
| Achromatopsia (no color) | #717171 | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1771CF
#1771CF
oklch(55.1% 0.165 254.3)
- #996600
#996600
oklch(55.1% 0.116 74.8)
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 #1771CF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.039
- Royal Blue #4169E1 ΔE 0.044
- Mid Blue #276AB3 ΔE 0.045
- Cerulean Blue #056EEE ΔE 0.049
- French Blue #436BAD ΔE 0.057
- Nice Blue #107AB0 ΔE 0.059
- Water Blue #0E87CC ΔE 0.062
- Flat Blue #3C73A8 ΔE 0.065
Use #1771CF 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.