#374BB1
Closest named color: Blue Blue (#2242C7). oklch(45.9% 0.163 270.3), rgb(55, 75, 177).
Aa
White text reads best on this color (7.48:1).
About this color
#374BB1 is a medium-dark, vivid blue. In OKLCH its lightness is 46%, its chroma 0.163 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.047 away. White text reads best on it, at 7.48:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.163) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.80:1 |
| White text | 7.48:1 |
Values
| HEX | #374BB1 |
| RGB | rgb(55, 75, 177) |
| HSL | hsl(230, 53%, 45%) |
| OKLCH | oklch(45.9% 0.163 270.3) |
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 #374BB1 | 7.48:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #374BB1 | 2.80:1 | Fails | Lc 18.4 | Dividers and decoration only |
| #374BB1 text on white | 7.48:1 | AAA | Lc 85.6 | Fine for body text |
| #374BB1 text on black | 2.80:1 | Fails | Lc -16.4 | 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
#5E7CFE
oklch(63.2% 0.195 270.2)
-
Step 600
600
#4860ED
oklch(55.6% 0.213 270.5)
-
Step 700
700
#3A4ECE
oklch(49% 0.198 270.4)
-
Step 800
800 (this color)
#374BB1
oklch(45.9% 0.163 270.3)
-
Step 900
900
#293984
oklch(37.8% 0.127 270.1)
-
Step 950
950
#18224D
oklch(27% 0.08 270.4)
#374BB1 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 | 0.045 |
| Deuteranopia (no green cones) | #004FAF | 0.036 |
| Tritanopia (no blue cones) | #006476 | 0.134 |
| Achromatopsia (no color) | #555555 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374BB1
#374BB1
oklch(45.9% 0.163 270.3)
- #6C5500
#6C5500
oklch(46% 0.094 90.5)
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 #374BB1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.047
- Blueberry #464196 ΔE 0.051
- Majorelle Blue #3F37C9 ΔE 0.056
- Sapphire #2138AB ΔE 0.056
- Blue With A Hint Of Purple #533CC6 ΔE 0.058
- Cobalt #1E488F ΔE 0.063
- Dusk Blue #26538D ΔE 0.067
- Blurple #5539CC ΔE 0.067
Use #374BB1 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.