#3F658D
Closest named color: Denim (#3B638C). oklch(49.6% 0.078 250.8), rgb(63, 101, 141).
Aa
White text reads best on this color (6.07:1).
About this color
#3F658D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.078 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.008 away. White text reads best on it, at 6.07:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.45:1 |
| White text | 6.07:1 |
Values
| HEX | #3F658D |
| RGB | rgb(63, 101, 141) |
| HSL | hsl(211, 38%, 40%) |
| OKLCH | oklch(49.6% 0.078 250.8) |
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 #3F658D | 6.07:1 | AA | Lc -85.4 | Fine for body text |
| Black text on #3F658D | 3.45:1 | AA large text | Lc 23.8 | Dividers and decoration only |
| #3F658D text on white | 6.07:1 | AA | Lc 80.2 | Fine for body text |
| #3F658D text on black | 3.45:1 | AA large text | Lc -21.6 | 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 700.
-
Step 50
50
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EBF1
oklch(93.7% 0.01 247.9)
-
Step 200
200
#CFDAE7
oklch(88.4% 0.022 252.5)
-
Step 300
300
#AFC3D9
oklch(80.9% 0.038 250.8)
-
Step 400
400
#85A4C5
oklch(70.7% 0.059 250.3)
-
Step 500
500
#668DB7
oklch(63.1% 0.077 250.9)
-
Step 600
600
#4D77A3
oklch(55.7% 0.083 250.6)
-
Step 700
700 (this color)
#3F658D
oklch(49.6% 0.078 250.8)
-
Step 800
800
#335171
oklch(42.6% 0.064 251)
-
Step 900
900
#2D435B
oklch(37.6% 0.05 251.3)
-
Step 950
950
#1B2836
oklch(27.2% 0.032 250.9)
#3F658D 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) | #55678F | 0.029 |
| Deuteranopia (no green cones) | #4B5F8C | 0.021 |
| Tritanopia (no blue cones) | #0F6E73 | 0.067 |
| Achromatopsia (no color) | #626262 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F658D
#3F658D
oklch(49.6% 0.078 250.8)
- #7E5A2D
#7E5A2D
oklch(49.6% 0.077 70.5)
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 #3F658D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.008
- Dusky Blue #475F94 ΔE 0.025
- Denim Blue #3B5B92 ΔE 0.034
- Peacock Blue #016795 ΔE 0.037
- Muted Blue #3B719F ΔE 0.040
- Light Navy Blue #2E5A88 ΔE 0.040
- YInMn Blue #415A77 ΔE 0.042
- Ocean Blue #03719C ΔE 0.045
Use #3F658D 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.