#373D69
Closest named color: Dark Grey Blue (#29465B). oklch(37.6% 0.075 276.3), rgb(55, 61, 105).
Aa
White text reads best on this color (10.32:1).
About this color
#373D69 is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.075 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.045 away. White text reads best on it, at 10.32:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.03:1 |
| White text | 10.32:1 |
Values
| HEX | #373D69 |
| RGB | rgb(55, 61, 105) |
| HSL | hsl(233, 31%, 31%) |
| OKLCH | oklch(37.6% 0.075 276.3) |
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 #373D69 | 10.32:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #373D69 | 2.03:1 | Fails | Lc 10.0 | Not readable |
| #373D69 text on white | 10.32:1 | AAA | Lc 93.9 | Preferred for body text |
| #373D69 text on black | 2.03:1 | Fails | Lc -8.7 | 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 900.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D3D8EE
oklch(88.5% 0.031 275.6)
-
Step 300
300
#B6BEE6
oklch(80.9% 0.057 276.2)
-
Step 400
400
#919CD9
oklch(70.7% 0.09 276)
-
Step 500
500
#7782CF
oklch(63.1% 0.116 276.4)
-
Step 600
600
#616ABC
oklch(55.5% 0.127 276.7)
-
Step 700
700
#5058A2
oklch(49% 0.118 276.5)
-
Step 800
800
#414983
oklch(42.7% 0.096 275.6)
-
Step 900
900 (this color)
#373D69
oklch(37.6% 0.075 276.3)
-
Step 950
950
#20243E
oklch(27% 0.049 276)
#373D69 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) | #2D426B | 0.019 |
| Deuteranopia (no green cones) | #293E68 | 0.020 |
| Tritanopia (no blue cones) | #26464E | 0.066 |
| Achromatopsia (no color) | #404040 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373D69
#373D69
oklch(37.6% 0.075 276.3)
- #4D4103
#4D4103
oklch(37.7% 0.076 96.9)
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 #373D69, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.045
- Twilight Blue #0A437A ΔE 0.050
- Prussian Blue #1D3557 ΔE 0.055
- Charcoal #264653 ΔE 0.058
- Marine Blue #01386A ΔE 0.058
- Dark Blue Grey #1F3B4D ΔE 0.061
- Dark Slate Blue #483D8B ΔE 0.064
- Light Navy #155084 ΔE 0.068
Use #373D69 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.