#373D9B
Closest named color: Blueberry (#464196). oklch(41.4% 0.151 274.9), rgb(55, 61, 155).
Aa
White text reads best on this color (9.11:1).
About this color
#373D9B is a dark, vivid blue. In OKLCH its lightness is 41%, its chroma 0.151 and its hue 275°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.027 away. White text reads best on it, at 9.11:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | vivid (0.151) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.30:1 |
| White text | 9.11:1 |
Values
| HEX | #373D9B |
| RGB | rgb(55, 61, 155) |
| HSL | hsl(236, 48%, 41%) |
| OKLCH | oklch(41.4% 0.151 274.9) |
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 #373D9B | 9.11:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #373D9B | 2.30:1 | Fails | Lc 13.4 | Not readable |
| #373D9B text on white | 9.11:1 | AAA | Lc 90.6 | Preferred for body text |
| #373D9B text on black | 2.30:1 | Fails | Lc -11.7 | 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
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E4E9FB
oklch(93.6% 0.025 273.5)
-
Step 200
200
#CFD7FA
oklch(88.4% 0.049 275.2)
-
Step 300
300
#AFBDFA
oklch(80.9% 0.088 274.3)
-
Step 400
400
#8798F8
oklch(70.7% 0.141 274.6)
-
Step 500
500
#6C7BF4
oklch(63.1% 0.18 274.7)
-
Step 600
600
#5660E3
oklch(55.6% 0.196 274.7)
-
Step 700
700
#474EC5
oklch(49% 0.182 274.9)
-
Step 800
800 (this color)
#373D9B
oklch(41.4% 0.151 274.9)
-
Step 900
900
#31387F
oklch(37.7% 0.119 274.9)
-
Step 950
950
#1D224A
oklch(27.1% 0.074 275)
#373D9B 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) | #004D9E | 0.052 |
| Deuteranopia (no green cones) | #004499 | 0.045 |
| Tritanopia (no blue cones) | #005466 | 0.126 |
| Achromatopsia (no color) | #484848 | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373D9B
#373D9B
oklch(41.4% 0.151 274.9)
- #5A4A00
#5A4A00
oklch(41.3% 0.085 94.7)
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 #373D9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.027
- Dark Slate Blue #483D8B ΔE 0.037
- Sapphire #2138AB ΔE 0.040
- Cobalt #1E488F ΔE 0.043
- Dusk Blue #26538D ΔE 0.066
- Indigo Blue #3A18B1 ΔE 0.071
- Light Navy #155084 ΔE 0.072
- Twilight Blue #0A437A ΔE 0.073
Use #373D9B 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.