#3A3F7B
Closest named color: Dark Slate Blue (#483D8B). oklch(39.5% 0.1 277.2), rgb(58, 63, 123).
Aa
White text reads best on this color (9.64:1).
About this color
#3A3F7B is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.100 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.036 away. White text reads best on it, at 9.64:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.17:1 |
| White text | 9.64:1 |
Values
| HEX | #3A3F7B |
| RGB | rgb(58, 63, 123) |
| HSL | hsl(235, 36%, 35%) |
| OKLCH | oklch(39.5% 0.1 277.2) |
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 #3A3F7B | 9.64:1 | AAA | Lc -96.4 | Preferred for body text |
| Black text on #3A3F7B | 2.17:1 | Fails | Lc 11.8 | Not readable |
| #3A3F7B text on white | 9.64:1 | AAA | Lc 92.2 | Preferred for body text |
| #3A3F7B text on black | 2.17:1 | Fails | Lc -10.2 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D2D7F5
oklch(88.5% 0.042 278)
-
Step 300
300
#B4BDF1
oklch(80.9% 0.074 277)
-
Step 400
400
#8E99EB
oklch(70.8% 0.12 277)
-
Step 500
500
#747DE4
oklch(63.1% 0.153 277.3)
-
Step 600
600
#5E64D2
oklch(55.6% 0.166 277.2)
-
Step 700
700
#4E52B6
oklch(49.1% 0.155 277.3)
-
Step 800
800
#404493
oklch(42.7% 0.128 277.4)
-
Step 900
900 (this color)
#3A3F7B
oklch(39.5% 0.1 277.2)
-
Step 950
950
#1F2245
oklch(26.9% 0.064 277.4)
#3A3F7B 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 | 0.032 |
| Deuteranopia (no green cones) | #1E427A | 0.034 |
| Tritanopia (no blue cones) | #1F4C57 | 0.088 |
| Achromatopsia (no color) | #454545 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3F7B
#3A3F7B
oklch(39.5% 0.1 277.2)
- #534600
#534600
oklch(39.6% 0.082 97)
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 #3A3F7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.036
- Cobalt #1E488F ΔE 0.047
- Twilight Blue #0A437A ΔE 0.047
- Blueberry #464196 ΔE 0.049
- Light Navy #155084 ΔE 0.056
- Dusk Blue #26538D ΔE 0.061
- Twilight #4E518B ΔE 0.065
- Dark Grey Blue #29465B ΔE 0.068
Use #3A3F7B 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.