#3F72AD
Closest named color: Flat Blue (#3C73A8). oklch(54.4% 0.108 253.4), rgb(63, 114, 173).
Aa
White text reads best on this color (4.97:1).
About this color
#3F72AD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.108 and its hue 253°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.010 away. White text reads best on it, at 4.97:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.22:1 |
| White text | 4.97:1 |
Values
| HEX | #3F72AD |
| RGB | rgb(63, 114, 173) |
| HSL | hsl(212, 47%, 46%) |
| OKLCH | oklch(54.4% 0.108 253.4) |
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 #3F72AD | 4.97:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #3F72AD | 4.22:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #3F72AD text on white | 4.97:1 | AA | Lc 74.2 | Content text, not long reading |
| #3F72AD text on black | 4.22:1 | AA large text | Lc -27.5 | 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
#F2F6FA
oklch(97.1% 0.007 247.9)
-
Step 100
100
#E3EBF3
oklch(93.6% 0.014 248)
-
Step 200
200
#CDDBEB
oklch(88.6% 0.027 251.7)
-
Step 300
300
#ABC3E0
oklch(80.9% 0.049 253.3)
-
Step 400
400
#7EA4D0
oklch(70.7% 0.077 252.5)
-
Step 500
500
#5D8CC4
oklch(63% 0.099 253.5)
-
Step 600
600 (this color)
#3F72AD
oklch(54.4% 0.108 253.4)
-
Step 700
700
#346398
oklch(49.2% 0.1 252.9)
-
Step 800
800
#2C517B
oklch(42.8% 0.082 252.9)
-
Step 900
900
#284363
oklch(37.7% 0.064 253.6)
-
Step 950
950
#18273A
oklch(26.9% 0.041 254.8)
#3F72AD 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) | #5975AF | 0.031 |
| Deuteranopia (no green cones) | #4A6BAC | 0.021 |
| Tritanopia (no blue cones) | #008087 | 0.089 |
| Achromatopsia (no color) | #707070 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F72AD
#3F72AD
oklch(54.4% 0.108 253.4)
- #956515
#956515
oklch(54.5% 0.108 73.9)
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 #3F72AD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.010
- French Blue #436BAD ΔE 0.020
- Muted Blue #3B719F ΔE 0.023
- Windows Blue #3778BF ΔE 0.029
- Nice Blue #107AB0 ΔE 0.032
- Dull Blue #49759C ΔE 0.032
- Mid Blue #276AB3 ΔE 0.035
- Cerulean #457B9D ΔE 0.042
Use #3F72AD 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.