#1D71CA
Closest named color: Windows Blue (#3778BF). oklch(54.9% 0.158 254), rgb(29, 113, 202).
Aa
White text reads best on this color (4.92:1).
About this color
#1D71CA is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.158 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.034 away. White text reads best on it, at 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.26:1 |
| White text | 4.92:1 |
Values
| HEX | #1D71CA |
| RGB | rgb(29, 113, 202) |
| HSL | hsl(211, 75%, 45%) |
| OKLCH | oklch(54.9% 0.158 254) |
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 #1D71CA | 4.92:1 | AA | Lc -79.0 | Fine for body text |
| Black text on #1D71CA | 4.26:1 | AA large text | Lc 30.5 | Non-text elements, placeholder text |
| #1D71CA text on white | 4.92:1 | AA | Lc 73.6 | Content text, not long reading |
| #1D71CA text on black | 4.26:1 | AA large text | Lc -28.1 | 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
#E1EBF8
oklch(93.6% 0.021 254.9)
-
Step 200
200
#C8DBF3
oklch(88.5% 0.039 254.3)
-
Step 300
300
#A1C4EE
oklch(80.9% 0.071 253.2)
-
Step 400
400
#6DA4E6
oklch(70.8% 0.113 253.7)
-
Step 500
500
#448BDF
oklch(63.1% 0.146 254.3)
-
Step 600
600 (this color)
#1D71CA
oklch(54.9% 0.158 254)
-
Step 700
700
#1160B1
oklch(49.1% 0.147 254.1)
-
Step 800
800
#134F8F
oklch(42.7% 0.121 253.9)
-
Step 900
900
#184272
oklch(37.7% 0.095 254)
-
Step 950
950
#0F2743
oklch(27% 0.06 253.9)
#1D71CA 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) | #4279CD | 0.037 |
| Deuteranopia (no green cones) | #1D69C8 | 0.022 |
| Tritanopia (no blue cones) | #008693 | 0.118 |
| Achromatopsia (no color) | #707070 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1D71CA
#1D71CA
oklch(54.9% 0.158 254)
- #996500
#996500
oklch(54.9% 0.116 73.9)
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 #1D71CA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.034
- Mid Blue #276AB3 ΔE 0.038
- Royal Blue #4169E1 ΔE 0.049
- French Blue #436BAD ΔE 0.050
- Nice Blue #107AB0 ΔE 0.052
- Cerulean Blue #056EEE ΔE 0.057
- Flat Blue #3C73A8 ΔE 0.057
- Water Blue #0E87CC ΔE 0.060
Use #1D71CA 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.