#3871E2
Closest named color: Royal Blue (#4169E1). oklch(57.3% 0.183 262.2), rgb(56, 113, 226).
Aa
Black text reads best on this color (4.62:1).
About this color
#3871E2 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.183 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.020 away. Black text reads best on it, at 4.62:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.183) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.62:1 |
| White text | 4.53:1 |
Values
| HEX | #3871E2 |
| RGB | rgb(56, 113, 226) |
| HSL | hsl(220, 75%, 55%) |
| OKLCH | oklch(57.3% 0.183 262.2) |
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 #3871E2 | 4.53:1 | AA | Lc -76.5 | Fine for body text |
| Black text on #3871E2 | 4.62:1 | AA | Lc 33.0 | Non-text elements, placeholder text |
| #3871E2 text on white | 4.53:1 | AA | Lc 71.0 | Content text, not long reading |
| #3871E2 text on black | 4.62:1 | AA | Lc -30.6 | 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
#F1F6FD
oklch(97.1% 0.011 256.7)
-
Step 100
100
#E1EAFA
oklch(93.5% 0.024 262.1)
-
Step 200
200
#C9DAF8
oklch(88.5% 0.045 261.9)
-
Step 300
300
#A4C1F6
oklch(80.8% 0.082 262.3)
-
Step 400
400
#739FF2
oklch(70.6% 0.131 262.3)
-
Step 500
500
#4F85EE
oklch(63.2% 0.168 262.2)
-
Step 600
600 (this color)
#3871E2
oklch(57.3% 0.183 262.2)
-
Step 700
700
#2659BF
oklch(49.1% 0.17 262.2)
-
Step 800
800
#21499B
oklch(42.7% 0.142 262.5)
-
Step 900
900
#1F3E7B
oklch(37.6% 0.11 262.2)
-
Step 950
950
#132548
oklch(27% 0.069 262.3)
#3871E2 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) | #2B7EE6 | 0.033 |
| Deuteranopia (no green cones) | #006FE0 | 0.027 |
| Tritanopia (no blue cones) | #008C9F | 0.143 |
| Achromatopsia (no color) | #767676 | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3871E2
#3871E2
oklch(57.3% 0.183 262.2)
- #9A7000
#9A7000
oklch(57.2% 0.118 82.4)
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 #3871E2, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.020
- Cerulean Blue #056EEE ΔE 0.031
- Neon Blue #4361EE ΔE 0.043
- Clear Blue #247AFD ΔE 0.044
- Bright Blue #0165FC ΔE 0.058
- Azul #1D5DEC ΔE 0.058
- Windows Blue #3778BF ΔE 0.060
- Warm Blue #4B57DB ΔE 0.062
Use #3871E2 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.