#1877CB
Closest named color: Windows Blue (#3778BF). oklch(56.2% 0.154 251.2), rgb(24, 119, 203).
Aa
White text reads best on this color (4.62:1).
About this color
#1877CB is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.154 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.025 away. White text reads best on it, at 4.62:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.154) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.53:1 |
| White text | 4.62:1 |
Values
| HEX | #1877CB |
| RGB | rgb(24, 119, 203) |
| HSL | hsl(208, 79%, 45%) |
| OKLCH | oklch(56.2% 0.154 251.2) |
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 #1877CB | 4.62:1 | AA | Lc -77.0 | Fine for body text |
| Black text on #1877CB | 4.53:1 | AA | Lc 32.5 | Non-text elements, placeholder text |
| #1877CB text on white | 4.62:1 | AA | Lc 71.6 | Content text, not long reading |
| #1877CB text on black | 4.53:1 | AA | Lc -30.1 | Non-text elements, placeholder text |
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
#E0EBF7
oklch(93.5% 0.02 250.4)
-
Step 200
200
#C7DCF2
oklch(88.6% 0.038 249.5)
-
Step 300
300
#A0C4EC
oklch(80.8% 0.069 251.4)
-
Step 400
400
#6AA5E3
oklch(70.7% 0.11 250.8)
-
Step 500
500
#3F8DDB
oklch(63.1% 0.141 251)
-
Step 600
600 (this color)
#1877CB
oklch(56.2% 0.154 251.2)
-
Step 700
700
#0162AE
oklch(49.1% 0.143 251.1)
-
Step 800
800
#0B508D
oklch(42.7% 0.119 251.5)
-
Step 900
900
#144370
oklch(37.6% 0.092 251)
-
Step 950
950
#0E2842
oklch(27.1% 0.058 250.8)
#1877CB 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) | #4C7DCE | 0.043 |
| Deuteranopia (no green cones) | #2D6EC9 | 0.024 |
| Tritanopia (no blue cones) | #008B97 | 0.112 |
| Achromatopsia (no color) | #757575 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1877CB
#1877CB
oklch(56.2% 0.154 251.2)
- #A16700
#A16700
oklch(56.3% 0.121 71.1)
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 #1877CB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.025
- Water Blue #0E87CC ΔE 0.044
- Nice Blue #107AB0 ΔE 0.045
- Mid Blue #276AB3 ΔE 0.047
- French Blue #436BAD ΔE 0.055
- Flat Blue #3C73A8 ΔE 0.055
- Royal Blue #4169E1 ΔE 0.057
- Cerulean Blue #056EEE ΔE 0.061
Use #1877CB 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.