#3F71AE
Closest named color: Flat Blue (#3C73A8). oklch(54.2% 0.11 254.5), rgb(63, 113, 174).
Aa
White text reads best on this color (5.01:1).
About this color
#3F71AE is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.110 and its hue 254°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.013 away. White text reads best on it, at 5.01:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.18:1 |
| White text | 5.01:1 |
Values
| HEX | #3F71AE |
| RGB | rgb(63, 113, 174) |
| HSL | hsl(213, 47%, 46%) |
| OKLCH | oklch(54.2% 0.11 254.5) |
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 #3F71AE | 5.01:1 | AA | Lc -79.9 | Fine for body text |
| Black text on #3F71AE | 4.18:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #3F71AE text on white | 5.01:1 | AA | Lc 74.5 | Content text, not long reading |
| #3F71AE text on black | 4.18:1 | AA large text | Lc -27.2 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E4EBF4
oklch(93.7% 0.014 254.6)
-
Step 200
200
#CDDBEC
oklch(88.6% 0.028 253.2)
-
Step 300
300
#ABC3E1
oklch(80.9% 0.05 254.1)
-
Step 400
400
#7FA3D2
oklch(70.7% 0.08 255.3)
-
Step 500
500
#5D8CC6
oklch(63.1% 0.102 254.3)
-
Step 600
600 (this color)
#3F71AE
oklch(54.2% 0.11 254.5)
-
Step 700
700
#356299
oklch(49.1% 0.102 254.5)
-
Step 800
800
#2C507C
oklch(42.6% 0.085 254.4)
-
Step 900
900
#284364
oklch(37.8% 0.066 254.2)
-
Step 950
950
#18273B
oklch(27% 0.043 255.9)
#3F71AE 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) | #5775B1 | 0.030 |
| Deuteranopia (no green cones) | #476AAD | 0.020 |
| Tritanopia (no blue cones) | #007F87 | 0.090 |
| Achromatopsia (no color) | #6F6F6F | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F71AE
#3F71AE
oklch(54.2% 0.11 254.5)
- #95640E
#95640E
oklch(54.2% 0.11 74)
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 #3F71AE, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.013
- French Blue #436BAD ΔE 0.017
- Muted Blue #3B719F ΔE 0.025
- Windows Blue #3778BF ΔE 0.029
- Mid Blue #276AB3 ΔE 0.032
- Nice Blue #107AB0 ΔE 0.034
- Dull Blue #49759C ΔE 0.035
- Cerulean #457B9D ΔE 0.045
Use #3F71AE 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.