#3F45DD
Closest named color: Majorelle Blue (#3F37C9). oklch(49.2% 0.225 272.8), rgb(63, 69, 221).
Aa
White text reads best on this color (6.75:1).
About this color
#3F45DD is a medium-dark, vivid blue. In OKLCH its lightness is 49%, its chroma 0.225 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Majorelle Blue (#3F37C9), ΔE 0.043 away. White text reads best on it, at 6.75:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.225) |
| Temperature | cool |
| Nearest name | Majorelle Blue (#3F37C9) |
| Black text | 3.10:1 |
| White text | 6.75:1 |
Values
| HEX | #3F45DD |
| RGB | rgb(63, 69, 221) |
| HSL | hsl(238, 70%, 56%) |
| OKLCH | oklch(49.2% 0.225 272.8) |
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 #3F45DD | 6.75:1 | AA | Lc -87.5 | Fine for body text |
| Black text on #3F45DD | 3.10:1 | AA large text | Lc 21.6 | Dividers and decoration only |
| #3F45DD text on white | 6.75:1 | AA | Lc 82.5 | Fine for body text |
| #3F45DD text on black | 3.10:1 | AA large text | Lc -19.4 | 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
#CCD8FF
oklch(88.6% 0.055 271.8)
-
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
#4D57FD
oklch(55.7% 0.241 272.8)
-
Step 700
700 (this color)
#3F45DD
oklch(49.2% 0.225 272.8)
-
Step 800
800
#333AB2
oklch(42.6% 0.186 272.8)
-
Step 900
900
#2B348D
oklch(37.7% 0.146 272.8)
-
Step 950
950
#192052
oklch(27% 0.091 272.8)
#3F45DD 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) | #0063E2 | 0.068 |
| Deuteranopia (no green cones) | #0054DA | 0.046 |
| Tritanopia (no blue cones) | #006F8C | 0.178 |
| Achromatopsia (no color) | #5B5B5B | 0.226 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3F45DD
#3F45DD
oklch(49.2% 0.225 272.8)
- #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 #3F45DD, closest first.
No curated palette has a color within ΔE 0.04 of #3F45DD.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Majorelle Blue #3F37C9 ΔE 0.043
- Warm Blue #4B57DB ΔE 0.044
- Blurple #5539CC ΔE 0.046
- Blue With A Hint Of Purple #533CC6 ΔE 0.049
- Blue Blue #2242C7 ΔE 0.049
- Purpley Blue #5F34E7 ΔE 0.052
- Azul #1D5DEC ΔE 0.057
- Light Royal Blue #3A2EFE ΔE 0.059
Use #3F45DD 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.