#3F40E5
Closest named color: Light Royal Blue (#3A2EFE). oklch(49.2% 0.24 273), rgb(63, 64, 229).
Aa
White text reads best on this color (6.82:1).
About this color
#3F40E5 is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.240 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Light Royal Blue (#3A2EFE), ΔE 0.044 away. White text reads best on it, at 6.82:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.240) |
| Temperature | cool |
| Nearest name | Light Royal Blue (#3A2EFE) |
| Black text | 3.07:1 |
| White text | 6.82:1 |
Values
| HEX | #3F40E5 |
| RGB | rgb(63, 64, 229) |
| HSL | hsl(240, 76%, 57%) |
| OKLCH | oklch(49.2% 0.24 273) |
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 #3F40E5 | 6.82:1 | AA | Lc -87.6 | Fine for body text |
| Black text on #3F40E5 | 3.07:1 | AA large text | Lc 21.5 | Dividers and decoration only |
| #3F40E5 text on white | 6.82:1 | AA | Lc 82.6 | Fine for body text |
| #3F40E5 text on black | 3.07:1 | AA large text | Lc -19.3 | 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 700.
-
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
#CCD7FF
oklch(88.4% 0.057 273.1)
-
Step 300
300
#ACBDFF
oklch(80.9% 0.095 273)
-
Step 400
400
#8298FF
oklch(70.8% 0.152 272.8)
-
Step 500
500
#6579FF
oklch(63.1% 0.198 273)
-
Step 600
600
#4D55FF
oklch(55.5% 0.246 273)
-
Step 700
700 (this color)
#3F40E5
oklch(49.2% 0.24 273)
-
Step 800
800
#3337B9
oklch(42.8% 0.199 272.9)
-
Step 900
900
#2B3292
oklch(37.7% 0.155 273.1)
-
Step 950
950
#181F55
oklch(27% 0.097 272.5)
#3F40E5 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) | #0063EA | 0.074 |
| Deuteranopia (no green cones) | #0053E2 | 0.049 |
| Tritanopia (no blue cones) | #006F8F | 0.187 |
| Achromatopsia (no color) | #5B5B5B | 0.241 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F40E5
#3F40E5
oklch(49.2% 0.24 273)
- #755F00
#755F00
oklch(49.3% 0.101 93.1)
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 #3F40E5, closest first.
No curated palette has a color within ΔE 0.04 of #3F40E5.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Light Royal Blue #3A2EFE ΔE 0.044
- Majorelle Blue #3F37C9 ΔE 0.049
- Purpley Blue #5F34E7 ΔE 0.049
- Blurple #5539CC ΔE 0.053
- Warm Blue #4B57DB ΔE 0.053
- Vibrant Blue #0339F8 ΔE 0.056
- Blue Blue #2242C7 ΔE 0.056
- Blue With A Hint Of Purple #533CC6 ΔE 0.058
Use #3F40E5 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.