#313E4F
Closest named color: Onyx (#343A40). oklch(36% 0.034 255.3), rgb(49, 62, 79).
Aa
White text reads best on this color (10.86:1).
About this color
#313E4F is a dark, muted blue. In OKLCH its lightness is 36%, its chroma 0.034 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.026 away. White text reads best on it, at 10.86:1.
| Hue family | Blues |
| Lightness | dark (36%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.93:1 |
| White text | 10.86:1 |
Values
| HEX | #313E4F |
| RGB | rgb(49, 62, 79) |
| HSL | hsl(214, 23%, 25%) |
| OKLCH | oklch(36% 0.034 255.3) |
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 #313E4F | 10.86:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #313E4F | 1.93:1 | Fails | Lc 8.7 | Not readable |
| #313E4F text on white | 10.86:1 | AAA | Lc 95.2 | Preferred for body text |
| #313E4F 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D3DAE3
oklch(88.6% 0.015 254.6)
-
Step 300
300
#B6C2D1
oklch(80.9% 0.025 254)
-
Step 400
400
#90A2BA
oklch(70.6% 0.041 255.7)
-
Step 500
500
#748BA9
oklch(63% 0.053 255.2)
-
Step 600
600
#5D7595
oklch(55.6% 0.058 255.8)
-
Step 700
700
#4C627F
oklch(49% 0.054 255.5)
-
Step 800
800
#3F5067
oklch(42.7% 0.044 256.1)
-
Step 900
900 (this color)
#313E4F
oklch(36% 0.034 255.3)
-
Step 950
950
#1F2731
oklch(27% 0.022 254.2)
#313E4F 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) | #383F50 | 0.012 |
| Deuteranopia (no green cones) | #343C4F | 0.007 |
| Tritanopia (no blue cones) | #284244 | 0.030 |
| Achromatopsia (no color) | #3D3D3D | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313E4F
#313E4F
oklch(36% 0.034 255.3)
- #483B29
#483B29
oklch(36.1% 0.034 75.4)
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 #313E4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.026
- Charcoal #264653 ΔE 0.027
- Dark Blue Grey #1F3B4D ΔE 0.027
- Dark Grey Blue #29465B ΔE 0.028
- Charcoal Grey #3C4142 ΔE 0.032
- Gunmetal #293241 ΔE 0.045
- Midnight Green #073B4C ΔE 0.045
- Prussian Blue #1D3557 ΔE 0.046
Use #313E4F 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.