#374FBB
Closest named color: Blue Blue (#2242C7). oklch(47.5% 0.172 269.3), rgb(55, 79, 187).
Aa
White text reads best on this color (7.00:1).
About this color
#374FBB is a medium-dark, vivid blue. In OKLCH its lightness is 47%, its chroma 0.172 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Blue Blue (#2242C7), ΔE 0.044 away. White text reads best on it, at 7.00:1.
| Hue family | Blues |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.172) |
| Temperature | cool |
| Nearest name | Blue Blue (#2242C7) |
| Black text | 2.99:1 |
| White text | 7.00:1 |
Values
| HEX | #374FBB |
| RGB | rgb(55, 79, 187) |
| HSL | hsl(229, 55%, 47%) |
| OKLCH | oklch(47.5% 0.172 269.3) |
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 #374FBB | 7.00:1 | AAA | Lc -88.8 | Fine for body text |
| Black text on #374FBB | 2.99:1 | Fails | Lc 20.3 | Dividers and decoration only |
| #374FBB text on white | 7.00:1 | AAA | Lc 83.8 | Fine for body text |
| #374FBB text on black | 2.99:1 | Fails | Lc -18.2 | 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 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
#CDD9F9
oklch(88.6% 0.046 269.2)
-
Step 300
300
#ABBFF7
oklch(80.9% 0.083 269.3)
-
Step 400
400
#7F9CF4
oklch(70.8% 0.133 269)
-
Step 500
500
#6180EF
oklch(63.1% 0.17 269.3)
-
Step 600
600
#4966DE
oklch(55.6% 0.186 269.3)
-
Step 700
700 (this color)
#374FBB
oklch(47.5% 0.172 269.3)
-
Step 800
800
#31459C
oklch(42.6% 0.143 269.6)
-
Step 900
900
#2A3B7C
oklch(37.6% 0.112 269.4)
-
Step 950
950
#192348
oklch(26.9% 0.07 269.8)
#374FBB 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) | #005FBF | 0.046 |
| Deuteranopia (no green cones) | #0053B9 | 0.034 |
| Tritanopia (no blue cones) | #006A7D | 0.139 |
| Achromatopsia (no color) | #595959 | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374FBB
#374FBB
oklch(47.5% 0.172 269.3)
- #725800
#725800
oklch(47.4% 0.097 88.7)
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 #374FBB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue Blue #2242C7 ΔE 0.044
- Majorelle Blue #3F37C9 ΔE 0.054
- Blue With A Hint Of Purple #533CC6 ΔE 0.054
- Warm Blue #4B57DB ΔE 0.060
- Blurple #5539CC ΔE 0.062
- Iris #6258C4 ΔE 0.067
- Blueberry #464196 ΔE 0.068
- Bluey Purple #6241C7 ΔE 0.068
Use #374FBB 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.