#374DB4
Closest named color: Blue Blue (#2242C7). oklch(46.5% 0.165 269.7), rgb(55, 77, 180).
Aa
White text reads best on this color (7.28:1).
About this color
#374DB4 is a medium-dark, vivid blue. In OKLCH its lightness is 47%, 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 7.28:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.165) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.88:1 |
| White text | 7.28:1 |
Values
| HEX | #374DB4 |
| RGB | rgb(55, 77, 180) |
| HSL | hsl(229, 53%, 46%) |
| OKLCH | oklch(46.5% 0.165 269.7) |
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 #374DB4 | 7.28:1 | AAA | Lc -89.8 | Fine for body text |
| Black text on #374DB4 | 2.88:1 | Fails | Lc 19.2 | Dividers and decoration only |
| #374DB4 text on white | 7.28:1 | AAA | Lc 84.9 | Fine for body text |
| #374DB4 text on black | 2.88:1 | Fails | Lc -17.1 | 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 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
#819CF0
oklch(70.7% 0.127 269.4)
-
Step 500
500
#6380EB
oklch(63% 0.164 269.8)
-
Step 600
600
#4C67D9
oklch(55.6% 0.177 269.8)
-
Step 700
700 (this color)
#374DB4
oklch(46.5% 0.165 269.7)
-
Step 800
800
#334699
oklch(42.7% 0.137 270)
-
Step 900
900
#2C3C79
oklch(37.7% 0.105 269.7)
-
Step 950
950
#1A2447
oklch(27.1% 0.066 269.6)
#374DB4 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) | #005CB8 | 0.045 |
| Deuteranopia (no green cones) | #0051B2 | 0.035 |
| Tritanopia (no blue cones) | #006679 | 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°).
- #374DB4
#374DB4
oklch(46.5% 0.165 269.7)
- #6E5600
#6E5600
oklch(46.5% 0.095 89.9)
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 #374DB4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.046
- Majorelle Blue #3F37C9 ΔE 0.056
- Blueberry #464196 ΔE 0.057
- Blue With A Hint Of Purple #533CC6 ΔE 0.057
- Sapphire #2138AB ΔE 0.061
- Blurple #5539CC ΔE 0.066
- Cobalt #1E488F ΔE 0.068
- Dusk Blue #26538D ΔE 0.070
Use #374DB4 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.