#3B3F7B
Closest named color: Dark Slate Blue (#483D8B). oklch(39.6% 0.1 277.9), rgb(59, 63, 123).
Aa
White text reads best on this color (9.61:1).
About this color
#3B3F7B is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.100 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.035 away. White text reads best on it, at 9.61:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.18:1 |
| White text | 9.61:1 |
Values
| HEX | #3B3F7B |
| RGB | rgb(59, 63, 123) |
| HSL | hsl(236, 35%, 36%) |
| OKLCH | oklch(39.6% 0.1 277.9) |
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 #3B3F7B | 9.61:1 | AAA | Lc -96.4 | Preferred for body text |
| Black text on #3B3F7B | 2.18:1 | Fails | Lc 11.8 | Not readable |
| #3B3F7B text on white | 9.61:1 | AAA | Lc 92.1 | Preferred for body text |
| #3B3F7B text on black | 2.18:1 | Fails | Lc -10.3 | 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 900.
-
Step 50
50
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D2D7F5
oklch(88.5% 0.042 278)
-
Step 300
300
#B5BDF1
oklch(81% 0.074 277.8)
-
Step 400
400
#8F98EA
oklch(70.6% 0.12 278.1)
-
Step 500
500
#757DE4
oklch(63.1% 0.153 277.7)
-
Step 600
600
#5F64D2
oklch(55.7% 0.166 277.6)
-
Step 700
700
#4F52B6
oklch(49.1% 0.155 277.8)
-
Step 800
800
#414493
oklch(42.8% 0.127 277.9)
-
Step 900
900 (this color)
#3B3F7B
oklch(39.6% 0.1 277.9)
-
Step 950
950
#202245
oklch(27% 0.064 278.7)
#3B3F7B 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) | #25477D | 0.033 |
| Deuteranopia (no green cones) | #1F427A | 0.035 |
| Tritanopia (no blue cones) | #224C57 | 0.087 |
| Achromatopsia (no color) | #454545 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3B3F7B
#3B3F7B
oklch(39.6% 0.1 277.9)
- #524600
#524600
oklch(39.5% 0.082 98)
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 #3B3F7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.035
- Cobalt #1E488F ΔE 0.047
- Blueberry #464196 ΔE 0.048
- Twilight Blue #0A437A ΔE 0.048
- Light Navy #155084 ΔE 0.057
- Dusk Blue #26538D ΔE 0.061
- Twilight #4E518B ΔE 0.064
- Dark Grey Blue #29465B ΔE 0.068
Use #3B3F7B 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.