#3745B1
Closest named color: Blue Blue (#2242C7). oklch(44.7% 0.171 271.9), rgb(55, 69, 177).
Aa
White text reads best on this color (7.92:1).
About this color
#3745B1 is a dark, vivid blue. In OKLCH its lightness is 45%, its chroma 0.171 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.042 away. White text reads best on it, at 7.92:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | vivid (0.171) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.64:1 |
| White text | 7.92:1 |
Values
| HEX | #3745B1 |
| RGB | rgb(55, 69, 177) |
| HSL | hsl(233, 53%, 45%) |
| OKLCH | oklch(44.7% 0.171 271.9) |
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 #3745B1 | 7.92:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #3745B1 | 2.64:1 | Fails | Lc 17.0 | Dividers and decoration only |
| #3745B1 text on white | 7.92:1 | AAA | Lc 87.0 | Fine for body text |
| #3745B1 text on black | 2.64:1 | Fails | Lc -15.1 | 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 800.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E3E9FE
oklch(93.6% 0.029 273.1)
-
Step 200
200
#CCD8FF
oklch(88.6% 0.055 271.8)
-
Step 300
300
#ABBDFF
oklch(80.9% 0.096 272.3)
-
Step 400
400
#8098FF
oklch(70.7% 0.153 272.1)
-
Step 500
500
#627AFF
oklch(63.1% 0.198 271.8)
-
Step 600
600
#4B5DF2
oklch(55.6% 0.222 271.7)
-
Step 700
700
#3E4BD3
oklch(49.2% 0.206 272)
-
Step 800
800 (this color)
#3745B1
oklch(44.7% 0.171 271.9)
-
Step 900
900
#2B3787
oklch(37.7% 0.134 271.9)
-
Step 950
950
#19214F
oklch(27% 0.085 272.1)
#3745B1 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) | #0057B5 | 0.051 |
| Deuteranopia (no green cones) | #004CAF | 0.039 |
| Tritanopia (no blue cones) | #006074 | 0.139 |
| Achromatopsia (no color) | #515151 | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #3745B1
#3745B1
oklch(44.7% 0.171 271.9)
- #675200
#675200
oklch(44.7% 0.091 91.6)
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 #3745B1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.042
- Sapphire #2138AB ΔE 0.044
- Majorelle Blue #3F37C9 ΔE 0.047
- Blueberry #464196 ΔE 0.048
- Blue With A Hint Of Purple #533CC6 ΔE 0.053
- Cobalt #1E488F ΔE 0.063
- Blurple #5539CC ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.067
Use #3745B1 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.