#3A477F
Closest named color: Cobalt (#1E488F). oklch(41.5% 0.095 271.9), rgb(58, 71, 127).
Aa
White text reads best on this color (8.79:1).
About this color
#3A477F is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.095 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.039 away. White text reads best on it, at 8.79:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.38:1 |
| White text | 8.79:1 |
Values
| HEX | #3A477F |
| RGB | rgb(58, 71, 127) |
| HSL | hsl(229, 37%, 36%) |
| OKLCH | oklch(41.5% 0.095 271.9) |
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 #3A477F | 8.79:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #3A477F | 2.38:1 | Fails | Lc 14.0 | Not readable |
| #3A477F text on white | 8.79:1 | AAA | Lc 90.0 | Fine for body text |
| #3A477F text on black | 2.38:1 | Fails | Lc -12.3 | 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
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EE
oklch(88.4% 0.031 273.6)
-
Step 300
300
#B4BFE5
oklch(80.9% 0.055 272.4)
-
Step 400
400
#8D9DD8
oklch(70.6% 0.089 272.3)
-
Step 500
500
#7184CE
oklch(63% 0.114 271.9)
-
Step 600
600
#5A6DBB
oklch(55.6% 0.123 271.6)
-
Step 700
700
#4A5BA1
oklch(49.2% 0.114 271.4)
-
Step 800
800 (this color)
#3A477F
oklch(41.5% 0.095 271.9)
-
Step 900
900
#343E69
oklch(37.6% 0.075 272.4)
-
Step 950
950
#1E253D
oklch(27% 0.046 270.7)
#3A477F 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) | #304E81 | 0.022 |
| Deuteranopia (no green cones) | #28487E | 0.022 |
| Tritanopia (no blue cones) | #1A535D | 0.084 |
| Achromatopsia (no color) | #4A4A4A | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3A477F
#3A477F
oklch(41.5% 0.095 271.9)
- #5D4A00
#5D4A00
oklch(41.7% 0.085 91.9)
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 #3A477F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.039
- Light Navy #155084 ΔE 0.040
- Dark Slate Blue #483D8B ΔE 0.040
- Dusk Blue #26538D ΔE 0.040
- Twilight #4E518B ΔE 0.046
- Blueberry #464196 ΔE 0.047
- Twilight Blue #0A437A ΔE 0.050
- Dusk #4E5481 ΔE 0.051
Use #3A477F 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.