#31374C
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34% 0.038 271.9), rgb(49, 55, 76).
Aa
White text reads best on this color (11.78:1).
About this color
#31374C is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.038 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.026 away. White text reads best on it, at 11.78:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.038) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.78:1 |
| White text | 11.78:1 |
Values
| HEX | #31374C |
| RGB | rgb(49, 55, 76) |
| HSL | hsl(227, 22%, 25%) |
| OKLCH | oklch(34% 0.038 271.9) |
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 #31374C | 11.78:1 | AAA | Lc -100.7 | Preferred for body text |
| Black text on #31374C | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #31374C text on white | 11.78:1 | AAA | Lc 97.1 | Preferred for body text |
| #31374C 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
#E8EAEF
oklch(93.7% 0.007 268.5)
-
Step 200
200
#D5D9E4
oklch(88.5% 0.016 270)
-
Step 300
300
#BAC0D4
oklch(80.9% 0.029 272.4)
-
Step 400
400
#969FBE
oklch(70.6% 0.046 272.4)
-
Step 500
500
#7D88AD
oklch(63.1% 0.057 271.8)
-
Step 600
600
#667199
oklch(55.5% 0.064 272.3)
-
Step 700
700
#555F83
oklch(49.2% 0.059 272.1)
-
Step 800
800
#454E6A
oklch(42.8% 0.048 270.5)
-
Step 900
900 (this color)
#31374C
oklch(34% 0.038 271.9)
-
Step 950
950
#222632
oklch(27% 0.023 270.4)
#31374C 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) | #30394D | 0.006 |
| Deuteranopia (no green cones) | #2E374B | 0.005 |
| Tritanopia (no blue cones) | #2A3B3E | 0.034 |
| Achromatopsia (no color) | #383838 | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31374C
#31374C
oklch(34% 0.038 271.9)
- #3F3821
#3F3821
oklch(34.2% 0.038 93.1)
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 #31374C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.026
- Onyx #343A40 ΔE 0.027
- Gunmetal #293241 ΔE 0.027
- Prussian Blue #1D3557 ΔE 0.035
- Space Cadet #2B2D42 ΔE 0.036
- Midnight Green #073B4C ΔE 0.044
- Charcoal Grey #3C4142 ΔE 0.046
- Charcoal #264653 ΔE 0.047
Use #31374C 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.