#3A4789
Closest named color: Cobalt (#1E488F). oklch(42.2% 0.11 272.5), rgb(58, 71, 137).
Aa
White text reads best on this color (8.59:1).
About this color
#3A4789 is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.110 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.031 away. White text reads best on it, at 8.59:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.44:1 |
| White text | 8.59:1 |
Values
| HEX | #3A4789 |
| RGB | rgb(58, 71, 137) |
| HSL | hsl(230, 41%, 38%) |
| OKLCH | oklch(42.2% 0.11 272.5) |
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 #3A4789 | 8.59:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #3A4789 | 2.44:1 | Fails | Lc 14.6 | Not readable |
| #3A4789 text on white | 8.59:1 | AAA | Lc 89.3 | Fine for body text |
| #3A4789 text on black | 2.44:1 | Fails | Lc -12.9 | 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 800.
-
Step 50
50
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5E9F7
oklch(93.5% 0.019 273.2)
-
Step 200
200
#D1D8F2
oklch(88.5% 0.037 273.7)
-
Step 300
300
#B2BFEB
oklch(81% 0.064 272)
-
Step 400
400
#8B9CE1
oklch(70.7% 0.103 272.9)
-
Step 500
500
#6F82D9
oklch(63.1% 0.133 272.8)
-
Step 600
600
#586AC6
oklch(55.6% 0.143 272.6)
-
Step 700
700
#4858AB
oklch(49.1% 0.133 272.4)
-
Step 800
800 (this color)
#3A4789
oklch(42.2% 0.11 272.5)
-
Step 900
900
#323D6F
oklch(37.7% 0.087 272.3)
-
Step 950
950
#1D2441
oklch(26.9% 0.055 272)
#3A4789 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) | #28508B | 0.030 |
| Deuteranopia (no green cones) | #1E4988 | 0.031 |
| Tritanopia (no blue cones) | #0C5661 | 0.099 |
| Achromatopsia (no color) | #4C4C4C | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A4789
#3A4789
oklch(42.2% 0.11 272.5)
- #5E4C00
#5E4C00
oklch(42.3% 0.087 93.2)
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 #3A4789, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.031
- Dark Slate Blue #483D8B ΔE 0.032
- Blueberry #464196 ΔE 0.032
- Dusk Blue #26538D ΔE 0.037
- Light Navy #155084 ΔE 0.043
- Twilight #4E518B ΔE 0.043
- Dusk #4E5481 ΔE 0.054
- Light Navy Blue #2E5A88 ΔE 0.055
Use #3A4789 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.