#3F779F
Closest named color: Dull Blue (#49759C). oklch(54.8% 0.086 241.7), rgb(63, 119, 159).
Aa
White text reads best on this color (4.82:1).
About this color
#3F779F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.086 and its hue 242°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.011 away. White text reads best on it, at 4.82:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.35:1 |
| White text | 4.82:1 |
Values
| HEX | #3F779F |
| RGB | rgb(63, 119, 159) |
| HSL | hsl(205, 43%, 44%) |
| OKLCH | oklch(54.8% 0.086 241.7) |
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 #3F779F | 4.82:1 | AA | Lc -78.7 | Fine for body text |
| Black text on #3F779F | 4.35:1 | AA large text | Lc 30.8 | Non-text elements, placeholder text |
| #3F779F text on white | 4.82:1 | AA | Lc 73.3 | Content text, not long reading |
| #3F779F text on black | 4.35:1 | AA large text | Lc -28.4 | 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
#F2F6F9
oklch(97.1% 0.006 239.8)
-
Step 100
100
#E4EBF1
oklch(93.6% 0.011 243.7)
-
Step 200
200
#CDDBE6
oklch(88.4% 0.021 241.4)
-
Step 300
300
#ABC4D8
oklch(80.8% 0.039 242.2)
-
Step 400
400
#7EA6C4
oklch(70.7% 0.062 241.1)
-
Step 500
500
#5D90B5
oklch(63.2% 0.078 241.1)
-
Step 600
600 (this color)
#3F779F
oklch(54.8% 0.086 241.7)
-
Step 700
700
#33668A
oklch(49.1% 0.08 241.6)
-
Step 800
800
#2B5370
oklch(42.6% 0.066 242)
-
Step 900
900
#27455B
oklch(37.7% 0.052 241.8)
-
Step 950
950
#172835
oklch(26.8% 0.033 242.4)
#3F779F 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) | #6577A1 | 0.044 |
| Deuteranopia (no green cones) | #586D9E | 0.037 |
| Tritanopia (no blue cones) | #008185 | 0.066 |
| Achromatopsia (no color) | #727272 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F779F
#3F779F
oklch(54.8% 0.086 241.7)
- #956539
#956539
oklch(54.8% 0.086 61.9)
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 #3F779F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.011
- Cerulean #457B9D ΔE 0.015
- Muted Blue #3B719F ΔE 0.019
- Flat Blue #3C73A8 ΔE 0.021
- Stormy Blue #507B9C ΔE 0.023
- Metallic Blue #4F738E ΔE 0.029
- Nice Blue #107AB0 ΔE 0.034
- Sea Blue #047495 ΔE 0.039
Use #3F779F 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.