#3870B8
Closest named color: French Blue (#436BAD). oklch(54.3% 0.128 255.8), rgb(56, 112, 184).
Aa
White text reads best on this color (5.02:1).
About this color
#3870B8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.128 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.021 away. White text reads best on it, at 5.02:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.17:1 |
| White text | 5.02:1 |
Values
| HEX | #3870B8 |
| RGB | rgb(56, 112, 184) |
| HSL | hsl(214, 53%, 47%) |
| OKLCH | oklch(54.3% 0.128 255.8) |
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 #3870B8 | 5.02:1 | AA | Lc -79.9 | Fine for body text |
| Black text on #3870B8 | 4.17:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #3870B8 text on white | 5.02:1 | AA | Lc 74.5 | Content text, not long reading |
| #3870B8 text on black | 4.17:1 | AA large text | Lc -27.3 | 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
#F2F6FB
oklch(97.2% 0.008 253.9)
-
Step 100
100
#E3EBF5
oklch(93.7% 0.016 253.9)
-
Step 200
200
#CCDBEF
oklch(88.6% 0.032 255.6)
-
Step 300
300
#A9C3E6
oklch(81% 0.057 255.9)
-
Step 400
400
#7AA3D9
oklch(70.7% 0.091 255.6)
-
Step 500
500
#578BCF
oklch(63% 0.117 255.7)
-
Step 600
600 (this color)
#3870B8
oklch(54.3% 0.128 255.8)
-
Step 700
700
#2E61A2
oklch(49.1% 0.118 255.7)
-
Step 800
800
#274F84
oklch(42.6% 0.099 256.3)
-
Step 900
900
#244269
oklch(37.6% 0.076 255.7)
-
Step 950
950
#16273E
oklch(27% 0.049 256.3)
#3870B8 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) | #4F75BB | 0.029 |
| Deuteranopia (no green cones) | #3C6AB7 | 0.016 |
| Tritanopia (no blue cones) | #00818B | 0.101 |
| Achromatopsia (no color) | #6F6F6F | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3870B8
#3870B8
oklch(54.3% 0.128 255.8)
- #956400
#956400
oklch(54.2% 0.114 75.4)
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 #3870B8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.021
- Windows Blue #3778BF ΔE 0.023
- Mid Blue #276AB3 ΔE 0.024
- Flat Blue #3C73A8 ΔE 0.029
- Nice Blue #107AB0 ΔE 0.038
- Muted Blue #3B719F ΔE 0.041
- Dull Blue #49759C ΔE 0.052
- Ocean Blue #03719C ΔE 0.055
Use #3870B8 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.