#313F57
Closest named color: Dark Grey Blue (#29465B). oklch(36.6% 0.046 261), rgb(49, 63, 87).
Aa
White text reads best on this color (10.61:1).
About this color
#313F57 is a dark, muted blue. In OKLCH its lightness is 37%, its chroma 0.046 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.022 away. White text reads best on it, at 10.61:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.97:1 |
| White text | 10.61:1 |
Values
| HEX | #313F57 |
| RGB | rgb(49, 63, 87) |
| HSL | hsl(218, 28%, 27%) |
| OKLCH | oklch(36.6% 0.046 261) |
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 #313F57 | 10.61:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #313F57 | 1.97:1 | Fails | Lc 9.3 | Not readable |
| #313F57 text on white | 10.61:1 | AAA | Lc 94.6 | Preferred for body text |
| #313F57 text on black | 1.97:1 | Fails | Lc -8.0 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF1
oklch(93.6% 0.01 261.8)
-
Step 200
200
#D2DAE6
oklch(88.6% 0.019 258.4)
-
Step 300
300
#B4C1D7
oklch(80.8% 0.034 261)
-
Step 400
400
#8EA1C3
oklch(70.6% 0.054 262)
-
Step 500
500
#728AB4
oklch(63.1% 0.069 261.4)
-
Step 600
600
#5A74A0
oklch(55.7% 0.075 260.7)
-
Step 700
700
#4A6189
oklch(49.1% 0.07 261.1)
-
Step 800
800
#3D4F6F
oklch(42.7% 0.058 261.6)
-
Step 900
900 (this color)
#313F57
oklch(36.6% 0.046 261)
-
Step 950
950
#1E2735
oklch(27.1% 0.029 259.1)
#313F57 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) | #364058 | 0.009 |
| Deuteranopia (no green cones) | #323D56 | 0.006 |
| Tritanopia (no blue cones) | #244447 | 0.041 |
| Achromatopsia (no color) | #3F3F3F | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313F57
#313F57
oklch(36.6% 0.046 261)
- #4B3C22
#4B3C22
oklch(36.6% 0.045 80.4)
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 #313F57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.022
- Charcoal #264653 ΔE 0.028
- Dark Blue Grey #1F3B4D ΔE 0.033
- Onyx #343A40 ΔE 0.039
- Charcoal Grey #3C4142 ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.045
- Midnight Green #073B4C ΔE 0.050
- Gunmetal #293241 ΔE 0.053
Use #313F57 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.