#3A3A7F
Closest named color: Dark Slate Blue (#483D8B). oklch(38.8% 0.114 279.7), rgb(58, 58, 127).
Aa
White text reads best on this color (10.04:1).
About this color
#3A3A7F is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.114 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.032 away. White text reads best on it, at 10.04:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.09:1 |
| White text | 10.04:1 |
Values
| HEX | #3A3A7F |
| RGB | rgb(58, 58, 127) |
| HSL | hsl(240, 37%, 36%) |
| OKLCH | oklch(38.8% 0.114 279.7) |
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 #3A3A7F | 10.04:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #3A3A7F | 2.09:1 | Fails | Lc 10.9 | Not readable |
| #3A3A7F text on white | 10.04:1 | AAA | Lc 93.1 | Preferred for body text |
| #3A3A7F text on black | 2.09:1 | Fails | Lc -9.4 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E6E8FB
oklch(93.5% 0.026 281.1)
-
Step 200
200
#D2D6F9
oklch(88.4% 0.048 280.2)
-
Step 300
300
#B5BBF7
oklch(80.9% 0.085 279.9)
-
Step 400
400
#9096F4
oklch(70.8% 0.137 279.5)
-
Step 500
500
#7778EF
oklch(63% 0.174 279.8)
-
Step 600
600
#625EDE
oklch(55.7% 0.19 279.7)
-
Step 700
700
#524CC1
oklch(49.1% 0.177 279.9)
-
Step 800
800
#423F9C
oklch(42.6% 0.147 279.6)
-
Step 900
900 (this color)
#3A3A7F
oklch(38.8% 0.114 279.7)
-
Step 950
950
#202148
oklch(27% 0.071 279.4)
#3A3A7F 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) | #154581 | 0.047 |
| Deuteranopia (no green cones) | #0C3F7E | 0.048 |
| Tritanopia (no blue cones) | #1C4956 | 0.099 |
| Achromatopsia (no color) | #424242 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3A7F
#3A3A7F
oklch(38.8% 0.114 279.7)
- #4F4500
#4F4500
oklch(38.9% 0.081 99.9)
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 #3A3A7F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.032
- Blueberry #464196 ΔE 0.046
- Cobalt #1E488F ΔE 0.050
- Twilight Blue #0A437A ΔE 0.052
- Light Navy #155084 ΔE 0.067
- Dusk Blue #26538D ΔE 0.071
- Marine Blue #01386A ΔE 0.071
- Twilight #4E518B ΔE 0.075
Use #3A3A7F 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.