#374F89
Closest named color: Dusk Blue (#26538D). oklch(43.8% 0.1 265.5), rgb(55, 79, 137).
Aa
White text reads best on this color (7.94:1).
About this color
#374F89 is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.100 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.019 away. White text reads best on it, at 7.94:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.64:1 |
| White text | 7.94:1 |
Values
| HEX | #374F89 |
| RGB | rgb(55, 79, 137) |
| HSL | hsl(222, 43%, 38%) |
| OKLCH | oklch(43.8% 0.1 265.5) |
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 #374F89 | 7.94:1 | AAA | Lc -92.1 | Preferred for body text |
| Black text on #374F89 | 2.64:1 | Fails | Lc 16.6 | Dividers and decoration only |
| #374F89 text on white | 7.94:1 | AAA | Lc 87.4 | Fine for body text |
| #374F89 text on black | 2.64:1 | Fails | Lc -14.7 | Not readable |
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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E4EAF6
oklch(93.6% 0.017 264.5)
-
Step 200
200
#CFD9EF
oklch(88.4% 0.032 266.1)
-
Step 300
300
#AFC1E7
oklch(81% 0.057 265.2)
-
Step 400
400
#859FDC
oklch(70.6% 0.095 266.3)
-
Step 500
500
#6687D2
oklch(63.1% 0.12 265.2)
-
Step 600
600
#4E6FBF
oklch(55.6% 0.13 265.5)
-
Step 700
700
#3F5DA5
oklch(49.2% 0.121 265.2)
-
Step 800
800 (this color)
#374F89
oklch(43.8% 0.1 265.5)
-
Step 900
900
#2D406B
oklch(37.7% 0.078 264.9)
-
Step 950
950
#1B263F
oklch(27.2% 0.049 265.2)
#374F89 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) | #36558B | 0.017 |
| Deuteranopia (no green cones) | #2B4D88 | 0.016 |
| Tritanopia (no blue cones) | #005C65 | 0.089 |
| Achromatopsia (no color) | #515151 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374F89
#374F89
oklch(43.8% 0.1 265.5)
- #684D00
#684D00
oklch(43.7% 0.09 85.3)
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 #374F89, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.019
- Light Navy #155084 ΔE 0.032
- Light Navy Blue #2E5A88 ΔE 0.033
- Twilight #4E518B ΔE 0.033
- Denim Blue #3B5B92 ΔE 0.037
- Cobalt #1E488F ΔE 0.037
- Dusk #4E5481 ΔE 0.039
- Deep Sea Blue #015482 ΔE 0.042
Use #374F89 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.