#3A3F73
Closest named color: Twilight Blue (#0A437A). oklch(39% 0.088 277.4), rgb(58, 63, 115).
Aa
White text reads best on this color (9.82:1).
About this color
#3A3F73 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.088 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.047 away. White text reads best on it, at 9.82:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.13:1 |
| White text | 9.82:1 |
Values
| HEX | #3A3F73 |
| RGB | rgb(58, 63, 115) |
| HSL | hsl(235, 33%, 34%) |
| OKLCH | oklch(39% 0.088 277.4) |
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 #3A3F73 | 9.82:1 | AAA | Lc -96.8 | Preferred for body text |
| Black text on #3A3F73 | 2.13:1 | Fails | Lc 11.3 | Not readable |
| #3A3F73 text on white | 9.82:1 | AAA | Lc 92.7 | Preferred for body text |
| #3A3F73 text on black | 2.13:1 | Fails | Lc -9.8 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F7
oklch(93.6% 0.019 276.3)
-
Step 200
200
#D3D7F2
oklch(88.4% 0.037 278.9)
-
Step 300
300
#B6BDEB
oklch(80.9% 0.065 278.1)
-
Step 400
400
#909AE2
oklch(70.7% 0.106 277.3)
-
Step 500
500
#7680D9
oklch(63.1% 0.133 277)
-
Step 600
600
#6067C7
oklch(55.6% 0.147 277.4)
-
Step 700
700
#5055AC
oklch(49.1% 0.136 277.6)
-
Step 800
800
#41468B
oklch(42.6% 0.113 277.4)
-
Step 900
900 (this color)
#3A3F73
oklch(39% 0.088 277.4)
-
Step 950
950
#202341
oklch(27% 0.056 277.7)
#3A3F73 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) | #2A4675 | 0.027 |
| Deuteranopia (no green cones) | #264172 | 0.027 |
| Tritanopia (no blue cones) | #254A53 | 0.078 |
| Achromatopsia (no color) | #434343 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3F73
#3A3F73
oklch(39% 0.088 277.4)
- #514500
#514500
oklch(39.1% 0.081 97.9)
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 #3A3F73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.047
- Dark Slate Blue #483D8B ΔE 0.047
- Cobalt #1E488F ΔE 0.056
- Dark Grey Blue #29465B ΔE 0.056
- Light Navy #155084 ΔE 0.059
- Blueberry #464196 ΔE 0.062
- Dusk Blue #26538D ΔE 0.066
- Marine Blue #01386A ΔE 0.066
Use #3A3F73 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.