#374D9B
Closest named color: Dusk Blue (#26538D). oklch(44.6% 0.13 268.8), rgb(55, 77, 155).
Aa
White text reads best on this color (7.78:1).
About this color
#374D9B is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.130 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk Blue (#26538D), ΔE 0.035 away. White text reads best on it, at 7.78:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.130) |
| Temperature | cool |
| Nearest name | Dusk Blue (#26538D) |
| Black text | 2.69:1 |
| White text | 7.78:1 |
Values
| HEX | #374D9B |
| RGB | rgb(55, 77, 155) |
| HSL | hsl(227, 48%, 41%) |
| OKLCH | oklch(44.6% 0.13 268.8) |
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 #374D9B | 7.78:1 | AAA | Lc -91.5 | Preferred for body text |
| Black text on #374D9B | 2.69:1 | Fails | Lc 17.3 | Dividers and decoration only |
| #374D9B text on white | 7.78:1 | AAA | Lc 86.8 | Fine for body text |
| #374D9B text on black | 2.69:1 | Fails | Lc -15.3 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CDD9F6
oklch(88.5% 0.042 267.7)
-
Step 300
300
#ACBFF3
oklch(80.8% 0.077 269)
-
Step 400
400
#819DEC
oklch(70.7% 0.12 268.4)
-
Step 500
500
#6382E6
oklch(63.1% 0.154 268.7)
-
Step 600
600
#4B69D4
oklch(55.5% 0.168 268.6)
-
Step 700
700
#3D57B8
oklch(49.1% 0.156 268.7)
-
Step 800
800 (this color)
#374D9B
oklch(44.6% 0.13 268.8)
-
Step 900
900
#2C3D77
oklch(37.8% 0.101 268.9)
-
Step 950
950
#1A2445
oklch(27% 0.063 269.2)
#374D9B 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) | #23579E | 0.030 |
| Deuteranopia (no green cones) | #0A4E99 | 0.035 |
| Tritanopia (no blue cones) | #005F6C | 0.110 |
| Achromatopsia (no color) | #525252 | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #374D9B
#374D9B
oklch(44.6% 0.13 268.8)
- #695100
#695100
oklch(44.7% 0.091 88.8)
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 #374D9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk Blue #26538D ΔE 0.035
- Blueberry #464196 ΔE 0.035
- Cobalt #1E488F ΔE 0.037
- Twilight #4E518B ΔE 0.044
- Denim Blue #3B5B92 ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.050
- Light Navy #155084 ΔE 0.051
- Light Navy Blue #2E5A88 ΔE 0.053
Use #374D9B 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.