#3A3F7A
Closest named color: Dark Slate Blue (#483D8B). oklch(39.4% 0.099 277.2), rgb(58, 63, 122).
Aa
White text reads best on this color (9.66:1).
About this color
#3A3F7A is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.099 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.037 away. White text reads best on it, at 9.66:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.17:1 |
| White text | 9.66:1 |
Values
| HEX | #3A3F7A |
| RGB | rgb(58, 63, 122) |
| HSL | hsl(235, 36%, 35%) |
| OKLCH | oklch(39.4% 0.099 277.2) |
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 #3A3F7A | 9.66:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #3A3F7A | 2.17:1 | Fails | Lc 11.7 | Not readable |
| #3A3F7A text on white | 9.66:1 | AAA | Lc 92.2 | Preferred for body text |
| #3A3F7A 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
#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
#B4BDF1
oklch(80.9% 0.074 277)
-
Step 400
400
#8E99EA
oklch(70.7% 0.119 277)
-
Step 500
500
#747DE3
oklch(63% 0.152 277.3)
-
Step 600
600
#5E64D1
oklch(55.5% 0.165 277.2)
-
Step 700
700
#4E53B5
oklch(49.2% 0.152 277)
-
Step 800
800
#404492
oklch(42.7% 0.126 277.4)
-
Step 900
900 (this color)
#3A3F7A
oklch(39.4% 0.099 277.2)
-
Step 950
950
#1F2244
oklch(26.8% 0.063 277.5)
#3A3F7A 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) | #25477C | 0.032 |
| Deuteranopia (no green cones) | #1F4279 | 0.033 |
| Tritanopia (no blue cones) | #204C56 | 0.088 |
| Achromatopsia (no color) | #444444 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3F7A
#3A3F7A
oklch(39.4% 0.099 277.2)
- #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 #3A3F7A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.037
- Twilight Blue #0A437A ΔE 0.047
- Cobalt #1E488F ΔE 0.048
- Blueberry #464196 ΔE 0.051
- Light Navy #155084 ΔE 0.056
- Dusk Blue #26538D ΔE 0.061
- Twilight #4E518B ΔE 0.066
- Dark Grey Blue #29465B ΔE 0.066
Use #3A3F7A 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.