#3937B1
Closest named color: Sapphire (#2138AB). oklch(42.4% 0.187 275.6), rgb(57, 55, 177).
Aa
White text reads best on this color (8.91:1).
About this color
#3937B1 is a dark, vivid blue. In OKLCH its lightness is 42%, its chroma 0.187 and its hue 276°. 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 8.91:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | vivid (0.187) |
| Temperature | cool |
| Nearest name | Sapphire (#2138AB) |
| Black text | 2.35:1 |
| White text | 8.91:1 |
Values
| HEX | #3937B1 |
| RGB | rgb(57, 55, 177) |
| HSL | hsl(241, 53%, 45%) |
| OKLCH | oklch(42.4% 0.187 275.6) |
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 #3937B1 | 8.91:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #3937B1 | 2.35:1 | Fails | Lc 14.3 | Not readable |
| #3937B1 text on white | 8.91:1 | AAA | Lc 89.7 | Fine for body text |
| #3937B1 text on black | 2.35:1 | Fails | Lc -12.5 | 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
#8796FF
oklch(70.7% 0.154 275.6)
-
Step 500
500
#6C77FF
oklch(63.2% 0.199 275.6)
-
Step 600
600
#5653FD
oklch(55.6% 0.244 275.8)
-
Step 700
700
#4742DC
oklch(49.1% 0.225 275.6)
-
Step 800
800 (this color)
#3937B1
oklch(42.4% 0.187 275.6)
-
Step 900
900
#30338D
oklch(37.8% 0.146 275.4)
-
Step 950
950
#1C1F52
oklch(27% 0.092 275.9)
#3937B1 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) | #004FB5 | 0.062 |
| Deuteranopia (no green cones) | #0044AF | 0.048 |
| Tritanopia (no blue cones) | #00586F | 0.152 |
| Achromatopsia (no color) | #4A4A4A | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3937B1
#3937B1
oklch(42.4% 0.187 275.6)
- #5D4D00
#5D4D00
oklch(42.4% 0.087 95.2)
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 #3937B1, closest first.
No curated palette has a color within ΔE 0.04 of #3937B1.
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 0.039
- Blue Blue #2242C7 ΔE 0.047
- Indigo Blue #3A18B1 ΔE 0.049
- Blueberry #464196 ΔE 0.055
- Blue With A Hint Of Purple #533CC6 ΔE 0.055
- Blurple #5539CC ΔE 0.062
- Imperial Purple #480CA8 ΔE 0.065
Use #3937B1 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.