#3A3A88
Closest named color: Dark Slate Blue (#483D8B). oklch(39.4% 0.127 278.9), rgb(58, 58, 136).
Aa
White text reads best on this color (9.81:1).
About this color
#3A3A88 is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.127 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.025 away. White text reads best on it, at 9.81:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.14:1 |
| White text | 9.81:1 |
Values
| HEX | #3A3A88 |
| RGB | rgb(58, 58, 136) |
| HSL | hsl(240, 40%, 38%) |
| OKLCH | oklch(39.4% 0.127 278.9) |
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 #3A3A88 | 9.81:1 | AAA | Lc -96.7 | Preferred for body text |
| Black text on #3A3A88 | 2.14:1 | Fails | Lc 11.5 | Not readable |
| #3A3A88 text on white | 9.81:1 | AAA | Lc 92.5 | Preferred for body text |
| #3A3A88 text on black | 2.14:1 | Fails | Lc -10.0 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E8FD
oklch(93.5% 0.029 279.4)
-
Step 200
200
#D1D6FD
oklch(88.5% 0.054 279.5)
-
Step 300
300
#B3BBFE
oklch(81% 0.095 278.8)
-
Step 400
400
#8D94FD
oklch(70.7% 0.152 278.9)
-
Step 500
500
#7475FB
oklch(63.1% 0.195 278.9)
-
Step 600
600
#5F59EA
oklch(55.5% 0.212 278.8)
-
Step 700
700
#4F48CC
oklch(49.1% 0.197 278.7)
-
Step 800
800
#413CA5
oklch(42.8% 0.163 279)
-
Step 900
900 (this color)
#3A3A88
oklch(39.4% 0.127 278.9)
-
Step 950
950
#1F204C
oklch(27% 0.08 278.7)
#3A3A88 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) | #02478B | 0.054 |
| Deuteranopia (no green cones) | #004086 | 0.053 |
| Tritanopia (no blue cones) | #124C5B | 0.110 |
| Achromatopsia (no color) | #444444 | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A3A88
#3A3A88
oklch(39.4% 0.127 278.9)
- #514600
#514600
oklch(39.3% 0.082 99)
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 #3A3A88, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.025
- Blueberry #464196 ΔE 0.035
- Cobalt #1E488F ΔE 0.045
- Twilight Blue #0A437A ΔE 0.058
- Sapphire #2138AB ΔE 0.066
- Light Navy #155084 ΔE 0.068
- Dusk Blue #26538D ΔE 0.069
- Twilight #4E518B ΔE 0.073
Use #3A3A88 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.