#313E5B
Closest named color: Dark Grey Blue (#29465B). oklch(36.6% 0.053 265.4), rgb(49, 62, 91).
Aa
White text reads best on this color (10.65:1).
About this color
#313E5B is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.053 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.026 away. White text reads best on it, at 10.65:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.053) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.97:1 |
| White text | 10.65:1 |
Values
| HEX | #313E5B |
| RGB | rgb(49, 62, 91) |
| HSL | hsl(221, 30%, 27%) |
| OKLCH | oklch(36.6% 0.053 265.4) |
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 #313E5B | 10.65:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #313E5B | 1.97:1 | Fails | Lc 9.2 | Not readable |
| #313E5B text on white | 10.65:1 | AAA | Lc 94.7 | Preferred for body text |
| #313E5B text on black | 1.97:1 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E8
oklch(88.4% 0.022 265.8)
-
Step 300
300
#B4C1DB
oklch(80.9% 0.039 264.3)
-
Step 400
400
#8DA0C9
oklch(70.6% 0.064 265.4)
-
Step 500
500
#7289BC
oklch(63.2% 0.082 265.4)
-
Step 600
600
#5A72A8
oklch(55.6% 0.089 265.3)
-
Step 700
700
#4A5F90
oklch(49.1% 0.083 265.8)
-
Step 800
800
#3D4E75
oklch(42.7% 0.069 265.6)
-
Step 900
900 (this color)
#313E5B
oklch(36.6% 0.053 265.4)
-
Step 950
950
#1E2637
oklch(26.9% 0.034 264.8)
#313E5B 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) | #34405C | 0.008 |
| Deuteranopia (no green cones) | #2F3D5A | 0.005 |
| Tritanopia (no blue cones) | #224448 | 0.048 |
| Achromatopsia (no color) | #3E3E3E | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313E5B
#313E5B
oklch(36.6% 0.053 265.4)
- #4B3C1B
#4B3C1B
oklch(36.4% 0.053 85.2)
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 #313E5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.026
- Charcoal #264653 ΔE 0.035
- Dark Blue Grey #1F3B4D ΔE 0.036
- Prussian Blue #1D3557 ΔE 0.042
- Onyx #343A40 ΔE 0.046
- Charcoal Grey #3C4142 ΔE 0.050
- Midnight Green #073B4C ΔE 0.053
- Gunmetal #293241 ΔE 0.056
Use #313E5B 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.