#3F669B
Closest named color: Dusky Blue (#475F94). oklch(50.6% 0.096 256.4), rgb(63, 102, 155).
Aa
White text reads best on this color (5.85:1).
About this color
#3F669B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.096 and its hue 256°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.021 away. White text reads best on it, at 5.85:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.58:1 |
| White text | 5.85:1 |
Values
| HEX | #3F669B |
| RGB | rgb(63, 102, 155) |
| HSL | hsl(215, 42%, 43%) |
| OKLCH | oklch(50.6% 0.096 256.4) |
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 #3F669B | 5.85:1 | AA | Lc -84.4 | Fine for body text |
| Black text on #3F669B | 3.58:1 | AA large text | Lc 24.9 | Dividers and decoration only |
| #3F669B text on white | 5.85:1 | AA | Lc 79.1 | Fine for body text |
| #3F669B text on black | 3.58:1 | 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
#CEDAEA
oklch(88.4% 0.026 255.6)
-
Step 300
300
#AEC2DF
oklch(80.8% 0.047 257.6)
-
Step 400
400
#83A3CF
oklch(70.8% 0.074 256.4)
-
Step 500
500
#638BC2
oklch(63% 0.095 256.5)
-
Step 600
600
#4A75AF
oklch(55.7% 0.103 256.3)
-
Step 700
700 (this color)
#3F669B
oklch(50.6% 0.096 256.4)
-
Step 800
800
#31507A
oklch(42.8% 0.079 256.4)
-
Step 900
900
#2B4262
oklch(37.6% 0.062 256.8)
-
Step 950
950
#1A2739
oklch(27% 0.038 256.7)
#3F669B 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) | #50699D | 0.023 |
| Deuteranopia (no green cones) | #44619A | 0.014 |
| Tritanopia (no blue cones) | #007279 | 0.083 |
| Achromatopsia (no color) | #656565 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F669B
#3F669B
oklch(50.6% 0.096 256.4)
- #845D18
#845D18
oklch(50.7% 0.096 76.8)
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 #3F669B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.021
- Denim #3B638C ΔE 0.025
- French Blue #436BAD ΔE 0.031
- Muted Blue #3B719F ΔE 0.031
- Denim Blue #3B5B92 ΔE 0.034
- Flat Blue #3C73A8 ΔE 0.039
- Peacock Blue #016795 ΔE 0.039
- Mid Blue #276AB3 ΔE 0.040
Use #3F669B 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.