#3F7399
Closest named color: Muted Blue (#3B719F). oklch(53.6% 0.082 242.1), rgb(63, 115, 153).
Aa
White text reads best on this color (5.09:1).
About this color
#3F7399 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.082 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Muted Blue (#3B719F), ΔE 0.013 away. White text reads best on it, at 5.09:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Muted Blue (#3B719F) |
| Black text | 4.12:1 |
| White text | 5.09:1 |
Values
| HEX | #3F7399 |
| RGB | rgb(63, 115, 153) |
| HSL | hsl(205, 42%, 42%) |
| OKLCH | oklch(53.6% 0.082 242.1) |
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 #3F7399 | 5.09:1 | AA | Lc -80.4 | Fine for body text |
| Black text on #3F7399 | 4.12:1 | AA large text | Lc 29.1 | Dividers and decoration only |
| #3F7399 text on white | 5.09:1 | AA | Lc 75.0 | Content text, not long reading |
| #3F7399 text on black | 4.12:1 | AA large text | Lc -26.7 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E4EBF0
oklch(93.6% 0.01 238.5)
-
Step 200
200
#CEDBE6
oklch(88.5% 0.021 243.4)
-
Step 300
300
#ADC4D7
oklch(80.9% 0.037 243.1)
-
Step 400
400
#80A6C3
oklch(70.8% 0.059 241.5)
-
Step 500
500
#608FB3
oklch(63.1% 0.075 242.3)
-
Step 600
600 (this color)
#3F7399
oklch(53.6% 0.082 242.1)
-
Step 700
700
#366688
oklch(49.2% 0.076 241.4)
-
Step 800
800
#2D536F
oklch(42.7% 0.064 242.2)
-
Step 900
900
#29455A
oklch(37.8% 0.05 242.1)
-
Step 950
950
#182834
oklch(26.8% 0.031 241.7)
#3F7399 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) | #62739B | 0.041 |
| Deuteranopia (no green cones) | #566A98 | 0.034 |
| Tritanopia (no blue cones) | #007C80 | 0.064 |
| Achromatopsia (no color) | #6E6E6E | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F7399
#3F7399
oklch(53.6% 0.082 242.1)
- #8F6239
#8F6239
oklch(53.5% 0.081 62)
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 #3F7399, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Muted Blue #3B719F ΔE 0.013
- Dull Blue #49759C ΔE 0.013
- Metallic Blue #4F738E ΔE 0.023
- Flat Blue #3C73A8 ΔE 0.024
- Cerulean #457B9D ΔE 0.025
- Stormy Blue #507B9C ΔE 0.031
- Sea Blue #047495 ΔE 0.033
- Ocean Blue #03719C ΔE 0.034
Use #3F7399 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.