#374CBB
Closest named color: Blue Blue (#2242C7). oklch(46.9% 0.176 270), rgb(55, 76, 187).
Aa
White text reads best on this color (7.20:1).
About this color
#374CBB is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.176 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.038 away. White text reads best on it, at 7.20:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.176) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.91:1 |
| White text | 7.20:1 |
Values
| HEX | #374CBB |
| RGB | rgb(55, 76, 187) |
| HSL | hsl(230, 55%, 47%) |
| OKLCH | oklch(46.9% 0.176 270) |
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 #374CBB | 7.20:1 | AAA | Lc -89.4 | Fine for body text |
| Black text on #374CBB | 2.91:1 | Fails | Lc 19.5 | Dividers and decoration only |
| #374CBB text on white | 7.20:1 | AAA | Lc 84.5 | Fine for body text |
| #374CBB text on black | 2.91:1 | Fails | Lc -17.5 | 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
#E3EAFB
oklch(93.7% 0.024 267.9)
-
Step 200
200
#CDD8F9
oklch(88.4% 0.047 270.8)
-
Step 300
300
#ABBFF8
oklch(81% 0.084 269.5)
-
Step 400
400
#809BF5
oklch(70.7% 0.135 270)
-
Step 500
500
#627FF1
oklch(63.1% 0.173 270.1)
-
Step 600
600
#4B65E0
oklch(55.6% 0.189 270.1)
-
Step 700
700 (this color)
#374CBB
oklch(46.9% 0.176 270)
-
Step 800
800
#32459D
oklch(42.8% 0.145 270)
-
Step 900
900
#2B3B7D
oklch(37.7% 0.113 270)
-
Step 950
950
#192349
oklch(27% 0.072 270)
#374CBB 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) | #005DBF | 0.047 |
| Deuteranopia (no green cones) | #0051B9 | 0.035 |
| Tritanopia (no blue cones) | #00687C | 0.142 |
| Achromatopsia (no color) | #575757 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374CBB
#374CBB
oklch(46.9% 0.176 270)
- #6F5700
#6F5700
oklch(46.8% 0.096 90.1)
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 #374CBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.038
- Majorelle Blue #3F37C9 ΔE 0.047
- Blue With A Hint Of Purple #533CC6 ΔE 0.050
- Blurple #5539CC ΔE 0.059
- Sapphire #2138AB ΔE 0.063
- Warm Blue #4B57DB ΔE 0.063
- Blueberry #464196 ΔE 0.065
- Bluey Purple #6241C7 ΔE 0.067
Use #374CBB 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.