#3729C7
Closest named color: Majorelle Blue (#3F37C9). oklch(42.6% 0.228 274.7), rgb(55, 41, 199).
Aa
White text reads best on this color (9.11:1).
About this color
#3729C7 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.228 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Majorelle Blue (#3F37C9), ΔE 0.028 away. White text reads best on it, at 9.11:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.228) |
| Temperature | cool |
| Nearest name | Majorelle Blue (#3F37C9) |
| Black text | 2.30:1 |
| White text | 9.11:1 |
Values
| HEX | #3729C7 |
| RGB | rgb(55, 41, 199) |
| HSL | hsl(245, 66%, 47%) |
| OKLCH | oklch(42.6% 0.228 274.7) |
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 #3729C7 | 9.11:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #3729C7 | 2.30:1 | Fails | Lc 14.3 | Not readable |
| #3729C7 text on white | 9.11:1 | AAA | Lc 89.7 | Fine for body text |
| #3729C7 text on black | 2.30:1 | Fails | Lc -12.6 | 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
#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
#8596FF
oklch(70.6% 0.154 274.8)
-
Step 500
500
#6A78FF
oklch(63.2% 0.198 274.8)
-
Step 600
600
#5353FF
oklch(55.6% 0.247 274.8)
-
Step 700
700
#452CF7
oklch(49.1% 0.275 274.9)
-
Step 800
800 (this color)
#3729C7
oklch(42.6% 0.228 274.7)
-
Step 900
900
#2D2B9D
oklch(37.8% 0.178 274.6)
-
Step 950
950
#1A1B5C
oklch(27% 0.113 275.1)
#3729C7 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) | #004FCB | 0.074 |
| Deuteranopia (no green cones) | #0041C4 | 0.052 |
| Tritanopia (no blue cones) | #005A78 | 0.178 |
| Achromatopsia (no color) | #484848 | 0.229 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3729C7
#3729C7
oklch(42.6% 0.228 274.7)
- #5E4D00
#5E4D00
oklch(42.5% 0.087 94.3)
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 #3729C7, closest first.
No curated palette has a color within ΔE 0.04 of #3729C7.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Majorelle Blue #3F37C9 ΔE 0.028
- Blue Blue #2242C7 ΔE 0.045
- Indigo Blue #3A18B1 ΔE 0.046
- Violet Blue #510AC9 ΔE 0.048
- Sapphire #2138AB ΔE 0.053
- Blue With A Hint Of Purple #533CC6 ΔE 0.060
- Blurple #5539CC ΔE 0.060
- Ultramarine Blue #1805DB ΔE 0.060
Use #3729C7 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.