#3871A5
Closest named color: Flat Blue (#3C73A8). oklch(53.4% 0.102 248.3), rgb(56, 113, 165).
Aa
White text reads best on this color (5.15:1).
About this color
#3871A5 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.102 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.008 away. White text reads best on it, at 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.07:1 |
| White text | 5.15:1 |
Values
| HEX | #3871A5 |
| RGB | rgb(56, 113, 165) |
| HSL | hsl(209, 49%, 43%) |
| OKLCH | oklch(53.4% 0.102 248.3) |
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 #3871A5 | 5.15:1 | AA | Lc -80.7 | Fine for body text |
| Black text on #3871A5 | 4.07:1 | AA large text | Lc 28.8 | Dividers and decoration only |
| #3871A5 text on white | 5.15:1 | AA | Lc 75.3 | Fine for body text |
| #3871A5 text on black | 4.07:1 | AA large text | Lc -26.4 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CDDBEA
oklch(88.5% 0.026 250)
-
Step 300
300
#AAC4DD
oklch(80.9% 0.045 247.3)
-
Step 400
400
#7CA5CD
oklch(70.7% 0.074 248.3)
-
Step 500
500
#5A8EC0
oklch(63.1% 0.094 248.6)
-
Step 600
600 (this color)
#3871A5
oklch(53.4% 0.102 248.3)
-
Step 700
700
#306494
oklch(49% 0.095 248.7)
-
Step 800
800
#295278
oklch(42.7% 0.079 248.5)
-
Step 900
900
#264460
oklch(37.7% 0.06 248.1)
-
Step 950
950
#172839
oklch(27.1% 0.039 249.5)
#3871A5 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) | #5A73A7 | 0.038 |
| Deuteranopia (no green cones) | #4B69A4 | 0.027 |
| Tritanopia (no blue cones) | #007D83 | 0.079 |
| Achromatopsia (no color) | #6D6D6D | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3871A5
#3871A5
oklch(53.4% 0.102 248.3)
- #936120
#936120
oklch(53.5% 0.102 68.9)
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 #3871A5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.008
- Muted Blue #3B719F ΔE 0.010
- French Blue #436BAD ΔE 0.025
- Dull Blue #49759C ΔE 0.027
- Nice Blue #107AB0 ΔE 0.031
- Ocean Blue #03719C ΔE 0.032
- Mid Blue #276AB3 ΔE 0.036
- Cerulean #457B9D ΔE 0.038
Use #3871A5 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.