#3870D7
Closest named color: Royal Blue (#4169E1). oklch(56.3% 0.169 261.3), rgb(56, 112, 215).
Aa
White text reads best on this color (4.70:1).
About this color
#3870D7 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.169 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.025 away. White text reads best on it, at 4.70:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.46:1 |
| White text | 4.70:1 |
Values
| HEX | #3870D7 |
| RGB | rgb(56, 112, 215) |
| HSL | hsl(219, 67%, 53%) |
| OKLCH | oklch(56.3% 0.169 261.3) |
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 #3870D7 | 4.70:1 | AA | Lc -77.7 | Fine for body text |
| Black text on #3870D7 | 4.46:1 | AA large text | Lc 31.9 | Non-text elements, placeholder text |
| #3870D7 text on white | 4.70:1 | AA | Lc 72.2 | Content text, not long reading |
| #3870D7 text on black | 4.46:1 | 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
#F2F6FD
oklch(97.2% 0.01 261.8)
-
Step 100
100
#E2EAF9
oklch(93.5% 0.022 263.2)
-
Step 200
200
#CADAF6
oklch(88.5% 0.042 261.7)
-
Step 300
300
#A5C2F3
oklch(81% 0.077 260.8)
-
Step 400
400
#75A0EC
oklch(70.6% 0.122 261.3)
-
Step 500
500
#5186E6
oklch(63% 0.156 261.3)
-
Step 600
600 (this color)
#3870D7
oklch(56.3% 0.169 261.3)
-
Step 700
700
#295BB8
oklch(49.1% 0.157 261.4)
-
Step 800
800
#234B95
oklch(42.7% 0.13 261.4)
-
Step 900
900
#213F77
oklch(37.7% 0.102 261.6)
-
Step 950
950
#142545
oklch(26.9% 0.064 261.9)
#3870D7 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) | #367BDB | 0.029 |
| Deuteranopia (no green cones) | #006DD5 | 0.029 |
| Tritanopia (no blue cones) | #008899 | 0.133 |
| Achromatopsia (no color) | #747474 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3870D7
#3870D7
oklch(56.3% 0.169 261.3)
- #986D00
#986D00
oklch(56.4% 0.116 81.2)
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 #3870D7, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.025
- Cerulean Blue #056EEE ΔE 0.042
- Windows Blue #3778BF ΔE 0.046
- Neon Blue #4361EE ΔE 0.052
- Mid Blue #276AB3 ΔE 0.060
- Clear Blue #247AFD ΔE 0.060
- Warm Blue #4B57DB ΔE 0.061
- Dark Periwinkle #665FD1 ΔE 0.062
Use #3870D7 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.