#31374E
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.2% 0.041 272.8), rgb(49, 55, 78).
Aa
White text reads best on this color (11.75:1).
About this color
#31374E is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.041 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.027 away. White text reads best on it, at 11.75:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.78:1 |
| White text | 11.75:1 |
Values
| HEX | #31374E |
| RGB | rgb(49, 55, 78) |
| HSL | hsl(228, 23%, 25%) |
| OKLCH | oklch(34.2% 0.041 272.8) |
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 #31374E | 11.75:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #31374E | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #31374E text on white | 11.75:1 | AAA | Lc 97.0 | Preferred for body text |
| #31374E text on black | 1.78:1 | Fails | Lc 0.0 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E8EAF0
oklch(93.7% 0.008 271.3)
-
Step 200
200
#D5D9E5
oklch(88.6% 0.017 271.2)
-
Step 300
300
#BAC0D5
oklch(81% 0.03 273)
-
Step 400
400
#969FC0
oklch(70.7% 0.049 273.1)
-
Step 500
500
#7C87B0
oklch(63% 0.063 272.8)
-
Step 600
600
#66719C
oklch(55.7% 0.068 273)
-
Step 700
700
#545E85
oklch(49% 0.064 272.8)
-
Step 800
800
#454D6C
oklch(42.6% 0.053 272.9)
-
Step 900
900 (this color)
#31374E
oklch(34.2% 0.041 272.8)
-
Step 950
950
#222633
oklch(27.1% 0.025 271.4)
#31374E 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) | #30394F | 0.006 |
| Deuteranopia (no green cones) | #2E374D | 0.005 |
| Tritanopia (no blue cones) | #293B3F | 0.036 |
| Achromatopsia (no color) | #383838 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31374E
#31374E
oklch(34.2% 0.041 272.8)
- #40381F
#40381F
oklch(34.2% 0.041 92.3)
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 #31374E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.027
- Gunmetal #293241 ΔE 0.030
- Onyx #343A40 ΔE 0.030
- Prussian Blue #1D3557 ΔE 0.033
- Space Cadet #2B2D42 ΔE 0.037
- Midnight Green #073B4C ΔE 0.045
- Dark Grey Blue #29465B ΔE 0.047
- Charcoal #264653 ΔE 0.048
Use #31374E 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.