#313D57
Closest named color: Dark Grey Blue (#29465B). oklch(36.1% 0.048 265), rgb(49, 61, 87).
Aa
White text reads best on this color (10.84:1).
About this color
#313D57 is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.048 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.028 away. White text reads best on it, at 10.84:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.93:1 |
| White text | 10.84:1 |
Values
| HEX | #313D57 |
| RGB | rgb(49, 61, 87) |
| HSL | hsl(221, 28%, 27%) |
| OKLCH | oklch(36.1% 0.048 265) |
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 #313D57 | 10.84:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #313D57 | 1.93:1 | Fails | Lc 8.8 | Not readable |
| #313D57 text on white | 10.84:1 | AAA | Lc 95.1 | Preferred for body text |
| #313D57 text on black | 1.93:1 | Fails | Lc -7.5 | 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
#E6EAF1
oklch(93.6% 0.01 261.8)
-
Step 200
200
#D3D9E7
oklch(88.5% 0.02 267.3)
-
Step 300
300
#B5C1D9
oklch(80.9% 0.036 264.3)
-
Step 400
400
#8FA1C5
oklch(70.8% 0.057 264.1)
-
Step 500
500
#7489B7
oklch(63.1% 0.074 265.4)
-
Step 600
600
#5C72A3
oklch(55.5% 0.081 265.3)
-
Step 700
700
#4C608B
oklch(49.1% 0.074 264.7)
-
Step 800
800
#3E4E71
oklch(42.6% 0.062 265.1)
-
Step 900
900 (this color)
#313D57
oklch(36.1% 0.048 265)
-
Step 950
950
#1F2636
oklch(26.9% 0.032 266.1)
#313D57 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) | #343F58 | 0.008 |
| Deuteranopia (no green cones) | #303C56 | 0.004 |
| Tritanopia (no blue cones) | #244246 | 0.043 |
| Achromatopsia (no color) | #3D3D3D | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313D57
#313D57
oklch(36.1% 0.048 265)
- #493B1E
#493B1E
oklch(36% 0.048 84.2)
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 #313D57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.028
- Dark Blue Grey #1F3B4D ΔE 0.031
- Charcoal #264653 ΔE 0.034
- Onyx #343A40 ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.040
- Charcoal Grey #3C4142 ΔE 0.045
- Midnight Green #073B4C ΔE 0.049
- Gunmetal #293241 ΔE 0.049
Use #313D57 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.