#3F4385
Closest named color: Dark Slate Blue (#483D8B). oklch(41.4% 0.108 277.9), rgb(63, 67, 133).
Aa
White text reads best on this color (8.92:1).
About this color
#3F4385 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.108 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.023 away. White text reads best on it, at 8.92:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.108) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.35:1 |
| White text | 8.92:1 |
Values
| HEX | #3F4385 |
| RGB | rgb(63, 67, 133) |
| HSL | hsl(237, 36%, 38%) |
| OKLCH | oklch(41.4% 0.108 277.9) |
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 #3F4385 | 8.92:1 | AAA | Lc -94.7 | Preferred for body text |
| Black text on #3F4385 | 2.35:1 | Fails | Lc 13.7 | Not readable |
| #3F4385 text on white | 8.92:1 | AAA | Lc 90.3 | Preferred for body text |
| #3F4385 text on black | 2.35:1 | Fails | Lc -12.0 | Not readable |
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 800.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F6
oklch(93.6% 0.018 279.1)
-
Step 200
200
#D3D7F1
oklch(88.4% 0.036 278.7)
-
Step 300
300
#B6BDEA
oklch(80.8% 0.064 277.9)
-
Step 400
400
#929ADF
oklch(70.7% 0.101 278.4)
-
Step 500
500
#7880D6
oklch(63.1% 0.129 278)
-
Step 600
600
#6268C4
oklch(55.7% 0.141 278)
-
Step 700
700
#5156A9
oklch(49.1% 0.131 277.8)
-
Step 800
800 (this color)
#3F4385
oklch(41.4% 0.108 277.9)
-
Step 900
900
#383C6E
oklch(37.8% 0.085 278.1)
-
Step 950
950
#202340
oklch(26.9% 0.054 277.6)
#3F4385 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) | #254C87 | 0.037 |
| Deuteranopia (no green cones) | #1E4784 | 0.039 |
| Tritanopia (no blue cones) | #22515D | 0.095 |
| Achromatopsia (no color) | #4A4A4A | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F4385
#3F4385
oklch(41.4% 0.108 277.9)
- #584B00
#584B00
oklch(41.3% 0.085 97.7)
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 #3F4385, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.023
- Blueberry #464196 ΔE 0.031
- Cobalt #1E488F ΔE 0.040
- Twilight #4E518B ΔE 0.048
- Dusk Blue #26538D ΔE 0.049
- Light Navy #155084 ΔE 0.053
- Dusk #4E5481 ΔE 0.058
- Twilight Blue #0A437A ΔE 0.058
Use #3F4385 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.