#3F71A6
Closest named color: Flat Blue (#3C73A8). oklch(53.8% 0.1 251.4), rgb(63, 113, 166).
Aa
White text reads best on this color (5.09:1).
About this color
#3F71A6 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.100 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Flat Blue (#3C73A8), ΔE 0.006 away. White text reads best on it, at 5.09:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Flat Blue (#3C73A8) |
| Black text | 4.12:1 |
| White text | 5.09:1 |
Values
| HEX | #3F71A6 |
| RGB | rgb(63, 113, 166) |
| HSL | hsl(211, 45%, 45%) |
| OKLCH | oklch(53.8% 0.1 251.4) |
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 #3F71A6 | 5.09:1 | AA | Lc -80.3 | Fine for body text |
| Black text on #3F71A6 | 4.12:1 | AA large text | Lc 29.1 | Dividers and decoration only |
| #3F71A6 text on white | 5.09:1 | AA | Lc 75.0 | Content text, not long reading |
| #3F71A6 text on black | 4.12:1 | AA large text | Lc -26.8 | 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
#CEDBEA
oklch(88.6% 0.025 251.9)
-
Step 300
300
#ACC3DD
oklch(80.8% 0.045 251.6)
-
Step 400
400
#80A4CD
oklch(70.7% 0.072 252.1)
-
Step 500
500
#5F8DBF
oklch(63.1% 0.091 251.4)
-
Step 600
600 (this color)
#3F71A6
oklch(53.8% 0.1 251.4)
-
Step 700
700
#366394
oklch(49.1% 0.094 252)
-
Step 800
800
#2D5178
oklch(42.7% 0.077 251.8)
-
Step 900
900
#294360
oklch(37.6% 0.059 252.1)
-
Step 950
950
#182838
oklch(27.1% 0.037 249.3)
#3F71A6 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) | #5A74A8 | 0.033 |
| Deuteranopia (no green cones) | #4D6AA5 | 0.023 |
| Tritanopia (no blue cones) | #007D84 | 0.081 |
| Achromatopsia (no color) | #6E6E6E | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F71A6
#3F71A6
oklch(53.8% 0.1 251.4)
- #926322
#926322
oklch(53.8% 0.1 71)
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 #3F71A6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Flat Blue #3C73A8 ΔE 0.006
- Muted Blue #3B719F ΔE 0.012
- French Blue #436BAD ΔE 0.023
- Dull Blue #49759C ΔE 0.024
- Nice Blue #107AB0 ΔE 0.034
- Cerulean #457B9D ΔE 0.037
- Mid Blue #276AB3 ΔE 0.038
- Ocean Blue #03719C ΔE 0.038
Use #3F71A6 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.