#3F45A0
Closest named color: Blueberry (#464196). oklch(43.8% 0.145 275.8), rgb(63, 69, 160).
Aa
White text reads best on this color (8.17:1).
About this color
#3F45A0 is a dark, vivid blue. In OKLCH its lightness is 44%, its chroma 0.145 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.020 away. White text reads best on it, at 8.17:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.57:1 |
| White text | 8.17:1 |
Values
| HEX | #3F45A0 |
| RGB | rgb(63, 69, 160) |
| HSL | hsl(236, 43%, 44%) |
| OKLCH | oklch(43.8% 0.145 275.8) |
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 #3F45A0 | 8.17:1 | AAA | Lc -92.6 | Preferred for body text |
| Black text on #3F45A0 | 2.57:1 | Fails | Lc 16.1 | Dividers and decoration only |
| #3F45A0 text on white | 8.17:1 | AAA | Lc 87.9 | Fine for body text |
| #3F45A0 text on black | 2.57:1 | Fails | Lc -14.2 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D0D7F9
oklch(88.5% 0.047 276.2)
-
Step 300
300
#B1BDF8
oklch(81% 0.085 275.4)
-
Step 400
400
#8A98F4
oklch(70.7% 0.135 275.8)
-
Step 500
500
#6F7BF0
oklch(63.1% 0.174 275.8)
-
Step 600
600
#5961DF
oklch(55.6% 0.189 275.6)
-
Step 700
700
#4A4FC1
oklch(49.1% 0.175 275.9)
-
Step 800
800 (this color)
#3F45A0
oklch(43.8% 0.145 275.8)
-
Step 900
900
#33397C
oklch(37.8% 0.112 275.8)
-
Step 950
950
#1D2249
oklch(27% 0.072 275)
#3F45A0 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) | #0053A3 | 0.054 |
| Deuteranopia (no green cones) | #004B9E | 0.051 |
| Tritanopia (no blue cones) | #005A6B | 0.125 |
| Achromatopsia (no color) | #4F4F4F | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F45A0
#3F45A0
oklch(43.8% 0.145 275.8)
- #615100
#615100
oklch(43.8% 0.09 95.9)
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 #3F45A0, closest first.
No curated palette has a color within ΔE 0.04 of #3F45A0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.020
- Dark Slate Blue #483D8B ΔE 0.040
- Cobalt #1E488F ΔE 0.048
- Sapphire #2138AB ΔE 0.055
- Twilight #4E518B ΔE 0.056
- Dusk Blue #26538D ΔE 0.057
- Denim Blue #3B5B92 ΔE 0.067
- Blue With A Hint Of Purple #533CC6 ΔE 0.069
Use #3F45A0 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.