#3F71A3
Closest named color: Muted Blue (#3B719F). oklch(53.6% 0.096 250), rgb(63, 113, 163).
Aa
White text reads best on this color (5.11:1).
About this color
#3F71A3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.096 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.008 away. White text reads best on it, at 5.11:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 4.10:1 |
| White text | 5.11:1 |
Values
| HEX | #3F71A3 |
| RGB | rgb(63, 113, 163) |
| HSL | hsl(210, 44%, 44%) |
| OKLCH | oklch(53.6% 0.096 250) |
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 #3F71A3 | 5.11:1 | AA | Lc -80.5 | Fine for body text |
| Black text on #3F71A3 | 4.10:1 | AA large text | Lc 29.0 | Dividers and decoration only |
| #3F71A3 text on white | 5.11:1 | AA | Lc 75.1 | Fine for body text |
| #3F71A3 text on black | 4.10:1 | AA large text | Lc -26.6 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF2
oklch(93.7% 0.012 248)
-
Step 200
200
#CEDBE9
oklch(88.6% 0.024 250.1)
-
Step 300
300
#ACC3DC
oklch(80.8% 0.043 250.6)
-
Step 400
400
#80A4CB
oklch(70.6% 0.07 250.8)
-
Step 500
500
#5F8DBD
oklch(63% 0.089 250.4)
-
Step 600
600 (this color)
#3F71A3
oklch(53.6% 0.096 250)
-
Step 700
700
#366491
oklch(49.1% 0.089 249.6)
-
Step 800
800
#2D5276
oklch(42.8% 0.074 249.3)
-
Step 900
900
#29445F
oklch(37.8% 0.057 249.6)
-
Step 950
950
#182838
oklch(27.1% 0.037 249.3)
#3F71A3 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) | #5C73A5 | 0.035 |
| Deuteranopia (no green cones) | #4E69A2 | 0.026 |
| Tritanopia (no blue cones) | #007D83 | 0.078 |
| Achromatopsia (no color) | #6E6E6E | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F71A3
#3F71A3
oklch(53.6% 0.096 250)
- #916327
#916327
oklch(53.7% 0.096 70.1)
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 #3F71A3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.008
- Flat Blue #3C73A8 ΔE 0.009
- Dull Blue #49759C ΔE 0.021
- French Blue #436BAD ΔE 0.026
- Cerulean #457B9D ΔE 0.035
- Nice Blue #107AB0 ΔE 0.035
- Ocean Blue #03719C ΔE 0.036
- Metallic Blue #4F738E ΔE 0.039
Use #3F71A3 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.