#403DA5
Closest named color: Blueberry (#464196). oklch(42.8% 0.162 278.3), rgb(64, 61, 165).
Aa
White text reads best on this color (8.64:1).
About this color
#403DA5 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.162 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.029 away. White text reads best on it, at 8.64:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.162) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.42:1 |
| White text | 8.64:1 |
Values
| HEX | #403DA5 |
| RGB | rgb(64, 61, 165) |
| HSL | hsl(242, 46%, 44%) |
| OKLCH | oklch(42.8% 0.162 278.3) |
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 #403DA5 | 8.64:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #403DA5 | 2.42:1 | Fails | Lc 14.8 | Not readable |
| #403DA5 text on white | 8.64:1 | AAA | Lc 89.2 | Fine for body text |
| #403DA5 text on black | 2.42:1 | Fails | Lc -13.0 | 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 800.
-
Step 50
50
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E5E9FD
oklch(93.7% 0.027 276.8)
-
Step 200
200
#D1D6FC
oklch(88.4% 0.053 279.4)
-
Step 300
300
#B2BBFE
oklch(80.9% 0.095 278.1)
-
Step 400
400
#8C94FD
oklch(70.6% 0.152 278.4)
-
Step 500
500
#7376FB
oklch(63.2% 0.194 278.3)
-
Step 600
600
#5E5AEA
oklch(55.6% 0.211 278.3)
-
Step 700
700
#4E48CC
oklch(49.1% 0.197 278.3)
-
Step 800
800 (this color)
#403DA5
oklch(42.8% 0.162 278.3)
-
Step 900
900
#353582
oklch(37.6% 0.126 278.4)
-
Step 950
950
#1F204C
oklch(27% 0.08 278.7)
#403DA5 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) | #0050A8 | 0.062 |
| Deuteranopia (no green cones) | #0047A3 | 0.056 |
| Tritanopia (no blue cones) | #00576B | 0.138 |
| Achromatopsia (no color) | #4C4C4C | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403DA5
#403DA5
oklch(42.8% 0.162 278.3)
- #5C4F00
#5C4F00
oklch(42.8% 0.088 98.3)
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 #403DA5, closest first.
No curated palette has a color within ΔE 0.04 of #403DA5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.029
- Sapphire #2138AB ΔE 0.044
- Dark Slate Blue #483D8B ΔE 0.044
- Majorelle Blue #3F37C9 ΔE 0.058
- Cobalt #1E488F ΔE 0.059
- Blue With A Hint Of Purple #533CC6 ΔE 0.060
- Blue Blue #2242C7 ΔE 0.064
- Indigo Blue #3A18B1 ΔE 0.067
Use #403DA5 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.