#373F6B
Closest named color: Dark Grey Blue (#29465B). oklch(38.2% 0.076 274.5), rgb(55, 63, 107).
Aa
White text reads best on this color (10.06:1).
About this color
#373F6B is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.076 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.043 away. White text reads best on it, at 10.06:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.08:1 |
| White text | 10.06:1 |
Values
| HEX | #373F6B |
| RGB | rgb(55, 63, 107) |
| HSL | hsl(231, 32%, 32%) |
| OKLCH | oklch(38.2% 0.076 274.5) |
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 #373F6B | 10.06:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #373F6B | 2.08:1 | Fails | Lc 10.6 | Not readable |
| #373F6B text on white | 10.06:1 | AAA | Lc 93.3 | Preferred for body text |
| #373F6B text on black | 2.08:1 | Fails | Lc -9.2 | 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
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EF
oklch(88.5% 0.032 274.1)
-
Step 300
300
#B5BFE6
oklch(81% 0.056 273.8)
-
Step 400
400
#8F9CD9
oklch(70.6% 0.091 274.6)
-
Step 500
500
#7583CF
oklch(63.1% 0.115 274.7)
-
Step 600
600
#5E6BBC
oklch(55.5% 0.126 274.7)
-
Step 700
700
#4E59A2
oklch(49.1% 0.117 274.8)
-
Step 800
800
#3F4984
oklch(42.7% 0.098 274.2)
-
Step 900
900 (this color)
#373F6B
oklch(38.2% 0.076 274.5)
-
Step 950
950
#1F243E
oklch(26.9% 0.049 274.4)
#373F6B 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) | #2F446D | 0.017 |
| Deuteranopia (no green cones) | #2A406A | 0.018 |
| Tritanopia (no blue cones) | #244850 | 0.066 |
| Achromatopsia (no color) | #424242 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373F6B
#373F6B
oklch(38.2% 0.076 274.5)
- #504205
#504205
oklch(38.3% 0.076 94.6)
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 #373F6B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.043
- Twilight Blue #0A437A ΔE 0.047
- Charcoal #264653 ΔE 0.057
- Prussian Blue #1D3557 ΔE 0.059
- Marine Blue #01386A ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.062
- Light Navy #155084 ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.064
Use #373F6B 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.