#3F759C
Closest named color: Dull Blue (#49759C). oklch(54.2% 0.084 241.9), rgb(63, 117, 156).
Aa
White text reads best on this color (4.95:1).
About this color
#3F759C is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.084 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.010 away. White text reads best on it, at 4.95:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.23:1 |
| White text | 4.95:1 |
Values
| HEX | #3F759C |
| RGB | rgb(63, 117, 156) |
| HSL | hsl(205, 42%, 43%) |
| OKLCH | oklch(54.2% 0.084 241.9) |
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 #3F759C | 4.95:1 | AA | Lc -79.6 | Fine for body text |
| Black text on #3F759C | 4.23:1 | AA large text | Lc 29.9 | Dividers and decoration only |
| #3F759C text on white | 4.95:1 | AA | Lc 74.2 | Content text, not long reading |
| #3F759C text on black | 4.23:1 | AA large text | Lc -27.6 | 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
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CEDBE6
oklch(88.5% 0.021 243.4)
-
Step 300
300
#ACC4D7
oklch(80.8% 0.038 241.9)
-
Step 400
400
#7FA6C4
oklch(70.7% 0.061 241.8)
-
Step 500
500
#5E8FB4
oklch(63% 0.077 242.1)
-
Step 600
600 (this color)
#3F759C
oklch(54.2% 0.084 241.9)
-
Step 700
700
#346689
oklch(49.1% 0.078 241.3)
-
Step 800
800
#2C536F
oklch(42.6% 0.064 241.6)
-
Step 900
900
#28455A
oklch(37.7% 0.05 241.3)
-
Step 950
950
#182835
oklch(26.9% 0.033 243.9)
#3F759C 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) | #64759E | 0.043 |
| Deuteranopia (no green cones) | #576C9B | 0.034 |
| Tritanopia (no blue cones) | #007F82 | 0.067 |
| Achromatopsia (no color) | #707070 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F759C
#3F759C
oklch(54.2% 0.084 241.9)
- #926439
#926439
oklch(54.3% 0.084 62.6)
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 #3F759C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.010
- Muted Blue #3B719F ΔE 0.015
- Cerulean #457B9D ΔE 0.019
- Flat Blue #3C73A8 ΔE 0.022
- Metallic Blue #4F738E ΔE 0.025
- Stormy Blue #507B9C ΔE 0.027
- Sea Blue #047495 ΔE 0.036
- Ocean Blue #03719C ΔE 0.037
Use #3F759C 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.