#3F45B8
Closest named color: Majorelle Blue (#3F37C9). oklch(45.8% 0.178 274.6), rgb(63, 69, 184).
Aa
White text reads best on this color (7.62:1).
About this color
#3F45B8 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.178 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Majorelle Blue (#3F37C9), ΔE 0.038 away. White text reads best on it, at 7.62:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.178) |
| Temperature | cool |
| Nearest name | Majorelle Blue (#3F37C9) |
| Black text | 2.75:1 |
| White text | 7.62:1 |
Values
| HEX | #3F45B8 |
| RGB | rgb(63, 69, 184) |
| HSL | hsl(237, 49%, 48%) |
| OKLCH | oklch(45.8% 0.178 274.6) |
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 #3F45B8 | 7.62:1 | AAA | Lc -90.8 | Preferred for body text |
| Black text on #3F45B8 | 2.75:1 | Fails | Lc 18.0 | Dividers and decoration only |
| #3F45B8 text on white | 7.62:1 | AAA | Lc 86.0 | Fine for body text |
| #3F45B8 text on black | 2.75:1 | Fails | Lc -16.1 | Dividers and decoration only |
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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FF
oklch(93.6% 0.03 273.6)
-
Step 200
200
#CED7FF
oklch(88.5% 0.056 275.2)
-
Step 300
300
#AEBCFF
oklch(80.9% 0.096 274.9)
-
Step 400
400
#8597FF
oklch(70.8% 0.153 274.4)
-
Step 500
500
#6978FF
oklch(63.1% 0.199 274.4)
-
Step 600
600
#5358F7
oklch(55.7% 0.232 274.5)
-
Step 700
700
#4546D7
oklch(49.1% 0.215 274.8)
-
Step 800
800 (this color)
#3F45B8
oklch(45.8% 0.178 274.6)
-
Step 900
900
#2F3589
oklch(37.8% 0.138 274.6)
-
Step 950
950
#1B2050
oklch(27% 0.087 274.5)
#3F45B8 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) | #0059BC | 0.058 |
| Deuteranopia (no green cones) | #004EB6 | 0.048 |
| Tritanopia (no blue cones) | #006278 | 0.146 |
| Achromatopsia (no color) | #545454 | 0.179 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F45B8
#3F45B8
oklch(45.8% 0.178 274.6)
- #685600
#685600
oklch(45.8% 0.094 94.9)
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 #3F45B8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Majorelle Blue #3F37C9 ΔE 0.038
- Blue With A Hint Of Purple #533CC6 ΔE 0.039
- Blue Blue #2242C7 ΔE 0.041
- Blurple #5539CC ΔE 0.048
- Blueberry #464196 ΔE 0.056
- Sapphire #2138AB ΔE 0.056
- Bluey Purple #6241C7 ΔE 0.059
- Warm Blue #4B57DB ΔE 0.072
Use #3F45B8 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.