#3F669C
Closest named color: Dusky Blue (#475F94). oklch(50.7% 0.097 256.8), rgb(63, 102, 156).
Aa
White text reads best on this color (5.84:1).
About this color
#3F669C is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.097 and its hue 257°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.022 away. White text reads best on it, at 5.84:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.59:1 |
| White text | 5.84:1 |
Values
| HEX | #3F669C |
| RGB | rgb(63, 102, 156) |
| HSL | hsl(215, 42%, 43%) |
| OKLCH | oklch(50.7% 0.097 256.8) |
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 #3F669C | 5.84:1 | AA | Lc -84.3 | Fine for body text |
| Black text on #3F669C | 3.59:1 | AA large text | Lc 25.0 | Dividers and decoration only |
| #3F669C text on white | 5.84:1 | AA | Lc 79.1 | Fine for body text |
| #3F669C text on black | 3.59:1 | AA large text | Lc -22.7 | 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 700.
-
Step 50
50
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CEDAEB
oklch(88.4% 0.027 257)
-
Step 300
300
#AEC2DF
oklch(80.8% 0.047 257.6)
-
Step 400
400
#82A3D0
oklch(70.8% 0.076 256.3)
-
Step 500
500
#638BC3
oklch(63.1% 0.096 256.9)
-
Step 600
600
#4974B0
oklch(55.5% 0.106 256.9)
-
Step 700
700 (this color)
#3F669C
oklch(50.7% 0.097 256.8)
-
Step 800
800
#31507B
oklch(42.8% 0.081 256.8)
-
Step 900
900
#2B4263
oklch(37.6% 0.064 257.4)
-
Step 950
950
#1A273A
oklch(27% 0.04 257.8)
#3F669C 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) | #506A9E | 0.025 |
| Deuteranopia (no green cones) | #43619B | 0.014 |
| Tritanopia (no blue cones) | #00727A | 0.083 |
| Achromatopsia (no color) | #656565 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F669C
#3F669C
oklch(50.7% 0.097 256.8)
- #845D16
#845D16
oklch(50.7% 0.097 77.2)
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 #3F669C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.022
- Denim #3B638C ΔE 0.027
- French Blue #436BAD ΔE 0.029
- Muted Blue #3B719F ΔE 0.031
- Denim Blue #3B5B92 ΔE 0.034
- Flat Blue #3C73A8 ΔE 0.038
- Mid Blue #276AB3 ΔE 0.039
- Peacock Blue #016795 ΔE 0.040
Use #3F669C 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.