#374AB1
Closest named color: Blue Blue (#2242C7). oklch(45.7% 0.165 270.5), rgb(55, 74, 177).
Aa
White text reads best on this color (7.56:1).
About this color
#374AB1 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.165 and its hue 271°. 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 7.56:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.165) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.77:1 |
| White text | 7.56:1 |
Values
| HEX | #374AB1 |
| RGB | rgb(55, 74, 177) |
| HSL | hsl(231, 53%, 45%) |
| OKLCH | oklch(45.7% 0.165 270.5) |
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 #374AB1 | 7.56:1 | AAA | Lc -90.7 | Preferred for body text |
| Black text on #374AB1 | 2.77:1 | Fails | Lc 18.2 | Dividers and decoration only |
| #374AB1 text on white | 7.56:1 | AAA | Lc 85.8 | Fine for body text |
| #374AB1 text on black | 2.77:1 | Fails | Lc -16.2 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FD
oklch(93.5% 0.028 272.5)
-
Step 200
200
#CBD8FD
oklch(88.4% 0.053 270)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7D99FF
oklch(70.7% 0.152 270.5)
-
Step 500
500
#5F7BFE
oklch(63% 0.196 270.7)
-
Step 600
600
#4860EE
oklch(55.7% 0.214 270.5)
-
Step 700
700
#3A4ECF
oklch(49.1% 0.199 270.4)
-
Step 800
800 (this color)
#374AB1
oklch(45.7% 0.165 270.5)
-
Step 900
900
#293884
oklch(37.5% 0.128 270.6)
-
Step 950
950
#18224E
oklch(27.1% 0.082 270.4)
#374AB1 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) | #005AB4 | 0.047 |
| Deuteranopia (no green cones) | #004FAF | 0.037 |
| Tritanopia (no blue cones) | #006376 | 0.133 |
| Achromatopsia (no color) | #545454 | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374AB1
#374AB1
oklch(45.7% 0.165 270.5)
- #6B5400
#6B5400
oklch(45.7% 0.093 90.3)
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 #374AB1, 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 0.050
- Majorelle Blue #3F37C9 ΔE 0.054
- Sapphire #2138AB ΔE 0.054
- Blue With A Hint Of Purple #533CC6 ΔE 0.057
- Cobalt #1E488F ΔE 0.063
- Blurple #5539CC ΔE 0.066
- Dusk Blue #26538D ΔE 0.068
Use #374AB1 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.