#373A67
Closest named color: Dark Grey Blue (#29465B). oklch(36.8% 0.077 279), rgb(55, 58, 103).
Aa
White text reads best on this color (10.69:1).
About this color
#373A67 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.077 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.050 away. White text reads best on it, at 10.69:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.96:1 |
| White text | 10.69:1 |
Values
| HEX | #373A67 |
| RGB | rgb(55, 58, 103) |
| HSL | hsl(236, 30%, 31%) |
| OKLCH | oklch(36.8% 0.077 279) |
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 #373A67 | 10.69:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #373A67 | 1.96:1 | Fails | Lc 9.2 | Not readable |
| #373A67 text on white | 10.69:1 | AAA | Lc 94.7 | Preferred for body text |
| #373A67 text on black | 1.96:1 | Fails | Lc -7.9 | 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
#D4D7EF
oklch(88.4% 0.033 280)
-
Step 300
300
#B8BDE6
oklch(80.8% 0.058 279.6)
-
Step 400
400
#949BDA
oklch(70.8% 0.092 278.9)
-
Step 500
500
#7B81CF
oklch(63.2% 0.117 279.1)
-
Step 600
600
#6469BC
oklch(55.6% 0.127 278.8)
-
Step 700
700
#5357A2
oklch(49% 0.118 278.8)
-
Step 800
800
#444784
oklch(42.6% 0.1 279.1)
-
Step 900
900 (this color)
#373A67
oklch(36.8% 0.077 279)
-
Step 950
950
#21243E
oklch(27.1% 0.048 277.6)
#373A67 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) | #294069 | 0.024 |
| Deuteranopia (no green cones) | #263C66 | 0.024 |
| Tritanopia (no blue cones) | #27434B | 0.067 |
| Achromatopsia (no color) | #3E3E3E | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373A67
#373A67
oklch(36.8% 0.077 279)
- #4A3F00
#4A3F00
oklch(36.8% 0.076 98)
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 #373A67, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.050
- Prussian Blue #1D3557 ΔE 0.050
- Twilight Blue #0A437A ΔE 0.054
- Marine Blue #01386A ΔE 0.056
- Dark Blue Grey #1F3B4D ΔE 0.059
- Charcoal #264653 ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.068
- Onyx #343A40 ΔE 0.070
Use #373A67 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.