#374CB3
Closest named color: Blue Blue (#2242C7). oklch(46.2% 0.165 270), rgb(55, 76, 179).
Aa
White text reads best on this color (7.37:1).
About this color
#374CB3 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.165 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.046 away. White text reads best on it, at 7.37:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.165) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.84:1 |
| White text | 7.37:1 |
Values
| HEX | #374CB3 |
| RGB | rgb(55, 76, 179) |
| HSL | hsl(230, 53%, 46%) |
| OKLCH | oklch(46.2% 0.165 270) |
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 #374CB3 | 7.37:1 | AAA | Lc -90.1 | Preferred for body text |
| Black text on #374CB3 | 2.84:1 | Fails | Lc 18.8 | Dividers and decoration only |
| #374CB3 text on white | 7.37:1 | AAA | Lc 85.2 | Fine for body text |
| #374CB3 text on black | 2.84:1 | Fails | Lc -16.8 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E4EAFA
oklch(93.7% 0.023 269.4)
-
Step 200
200
#CDD8F7
oklch(88.4% 0.044 270)
-
Step 300
300
#ACBFF5
oklch(80.9% 0.079 269.5)
-
Step 400
400
#829CF0
oklch(70.8% 0.127 269.9)
-
Step 500
500
#6480EB
oklch(63% 0.163 270.1)
-
Step 600
600
#4D67D9
oklch(55.6% 0.177 270.1)
-
Step 700
700 (this color)
#374CB3
oklch(46.2% 0.165 270)
-
Step 800
800
#334699
oklch(42.7% 0.137 270)
-
Step 900
900
#2C3C79
oklch(37.7% 0.105 269.7)
-
Step 950
950
#1A2347
oklch(26.9% 0.068 270.7)
#374CB3 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) | #005CB6 | 0.047 |
| Deuteranopia (no green cones) | #0050B1 | 0.036 |
| Tritanopia (no blue cones) | #006578 | 0.133 |
| Achromatopsia (no color) | #565656 | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374CB3
#374CB3
oklch(46.2% 0.165 270)
- #6D5500
#6D5500
oklch(46.1% 0.094 89.7)
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 #374CB3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.046
- Blueberry #464196 ΔE 0.054
- Majorelle Blue #3F37C9 ΔE 0.055
- Blue With A Hint Of Purple #533CC6 ΔE 0.057
- Sapphire #2138AB ΔE 0.059
- Blurple #5539CC ΔE 0.066
- Cobalt #1E488F ΔE 0.066
- Dusk Blue #26538D ΔE 0.069
Use #374CB3 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.