#1275CD
Closest named color: Windows Blue (#3778BF). oklch(55.8% 0.159 251.9), rgb(18, 117, 205).
Aa
White text reads best on this color (4.71:1).
About this color
#1275CD is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.159 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.031 away. White text reads best on it, at 4.71:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.159) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.45:1 |
| White text | 4.71:1 |
Values
| HEX | #1275CD |
| RGB | rgb(18, 117, 205) |
| HSL | hsl(208, 84%, 44%) |
| OKLCH | oklch(55.8% 0.159 251.9) |
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 #1275CD | 4.71:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #1275CD | 4.45:1 | AA large text | Lc 31.9 | Non-text elements, placeholder text |
| #1275CD text on white | 4.71:1 | AA | Lc 72.1 | Content text, not long reading |
| #1275CD text on black | 4.45:1 | AA large text | Lc -29.5 | 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
#C7DBF3
oklch(88.4% 0.04 253)
-
Step 300
300
#9FC4EE
oklch(80.8% 0.072 251.9)
-
Step 400
400
#69A5E6
oklch(70.8% 0.115 251.5)
-
Step 500
500
#3D8CDF
oklch(63.1% 0.147 252.2)
-
Step 600
600 (this color)
#1275CD
oklch(55.8% 0.159 251.9)
-
Step 700
700
#0061B0
oklch(49% 0.147 252)
-
Step 800
800
#08508F
oklch(42.8% 0.122 251.8)
-
Step 900
900
#134372
oklch(37.7% 0.095 251.6)
-
Step 950
950
#0D2743
oklch(26.9% 0.061 252.5)
#1275CD 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) | #477CD0 | 0.042 |
| Deuteranopia (no green cones) | #226CCB | 0.024 |
| Tritanopia (no blue cones) | #008A97 | 0.116 |
| Achromatopsia (no color) | #737373 | 0.159 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1275CD
#1275CD
oklch(55.8% 0.159 251.9)
- #9E6600
#9E6600
oklch(55.7% 0.119 71.9)
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 #1275CD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.031
- Mid Blue #276AB3 ΔE 0.046
- Nice Blue #107AB0 ΔE 0.050
- Water Blue #0E87CC ΔE 0.051
- Royal Blue #4169E1 ΔE 0.052
- Cerulean Blue #056EEE ΔE 0.056
- French Blue #436BAD ΔE 0.057
- Flat Blue #3C73A8 ΔE 0.060
Use #1275CD 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.