#373D60
Closest named color: Dark Grey Blue (#29465B). oklch(37.1% 0.061 275.6), rgb(55, 61, 96).
Aa
White text reads best on this color (10.50:1).
About this color
#373D60 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.061 and its hue 276°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.036 away. White text reads best on it, at 10.50:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.99:1 |
| White text | 10.50:1 |
Values
| HEX | #373D60 |
| RGB | rgb(55, 61, 96) |
| HSL | hsl(231, 27%, 30%) |
| OKLCH | oklch(37.1% 0.061 275.6) |
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 #373D60 | 10.50:1 | AAA | Lc -98.3 | Preferred for body text |
| Black text on #373D60 | 1.99:1 | Fails | Lc 9.6 | Not readable |
| #373D60 text on white | 10.50:1 | AAA | Lc 94.3 | Preferred for body text |
| #373D60 text on black | 1.99:1 | Fails | Lc -8.2 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EA
oklch(88.5% 0.025 275.9)
-
Step 300
300
#B8BFDF
oklch(81% 0.046 275.6)
-
Step 400
400
#939DCE
oklch(70.6% 0.073 275.4)
-
Step 500
500
#7A85C2
oklch(63.2% 0.093 275.6)
-
Step 600
600
#636DAE
oklch(55.5% 0.102 275.9)
-
Step 700
700
#525B96
oklch(49.1% 0.095 275.8)
-
Step 800
800
#434B79
oklch(42.7% 0.077 275.2)
-
Step 900
900 (this color)
#373D60
oklch(37.1% 0.061 275.6)
-
Step 950
950
#212539
oklch(27% 0.038 274.9)
#373D60 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) | #314161 | 0.014 |
| Deuteranopia (no green cones) | #2E3E5F | 0.013 |
| Tritanopia (no blue cones) | #2A444A | 0.054 |
| Achromatopsia (no color) | #3F3F3F | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #373D60
#373D60
oklch(37.1% 0.061 275.6)
- #4A4016
#4A4016
oklch(37.2% 0.061 95.9)
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 #373D60, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.036
- Charcoal #264653 ΔE 0.046
- Prussian Blue #1D3557 ΔE 0.048
- Dark Blue Grey #1F3B4D ΔE 0.049
- Onyx #343A40 ΔE 0.056
- Charcoal Grey #3C4142 ΔE 0.058
- Twilight Blue #0A437A ΔE 0.058
- Marine Blue #01386A ΔE 0.061
Use #373D60 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.