#3939B0
Closest named color: Sapphire (#2138AB). oklch(42.7% 0.183 275.3), rgb(57, 57, 176).
Aa
White text reads best on this color (8.80:1).
About this color
#3939B0 is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.183 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Sapphire (#2138AB), ΔE 0.031 away. White text reads best on it, at 8.80:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.183) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.38:1 |
| White text | 8.80:1 |
Values
| HEX | #3939B0 |
| RGB | rgb(57, 57, 176) |
| HSL | hsl(240, 51%, 46%) |
| OKLCH | oklch(42.7% 0.183 275.3) |
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 #3939B0 | 8.80:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #3939B0 | 2.38:1 | Fails | Lc 14.5 | Not readable |
| #3939B0 text on white | 8.80:1 | AAA | Lc 89.5 | Fine for body text |
| #3939B0 text on black | 2.38:1 | Fails | Lc -12.8 | 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
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E4E9FF
oklch(93.7% 0.03 275.6)
-
Step 200
200
#CED7FF
oklch(88.5% 0.056 275.2)
-
Step 300
300
#AFBCFF
oklch(80.9% 0.096 275.6)
-
Step 400
400
#8696FF
oklch(70.7% 0.154 275.2)
-
Step 500
500
#6B77FF
oklch(63.1% 0.199 275.3)
-
Step 600
600
#5555FA
oklch(55.6% 0.238 275.4)
-
Step 700
700
#4643DA
oklch(49% 0.222 275.3)
-
Step 800
800 (this color)
#3939B0
oklch(42.7% 0.183 275.3)
-
Step 900
900
#30338B
oklch(37.6% 0.143 275.6)
-
Step 950
950
#1B1F51
oklch(26.9% 0.09 275.1)
#3939B0 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) | #0050B4 | 0.060 |
| Deuteranopia (no green cones) | #0045AE | 0.047 |
| Tritanopia (no blue cones) | #00596F | 0.150 |
| Achromatopsia (no color) | #4A4A4A | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3939B0
#3939B0
oklch(42.7% 0.183 275.3)
- #5E4E00
#5E4E00
oklch(42.8% 0.088 95.4)
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 #3939B0, closest first.
No curated palette has a color within ΔE 0.04 of #3939B0.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sapphire #2138AB ΔE 0.031
- Majorelle Blue #3F37C9 ΔE 0.041
- Blue Blue #2242C7 ΔE 0.047
- Blueberry #464196 ΔE 0.051
- Indigo Blue #3A18B1 ΔE 0.053
- Blue With A Hint Of Purple #533CC6 ΔE 0.055
- Blurple #5539CC ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.066
Use #3939B0 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.