#313B4C
Closest named color: Onyx (#343A40). oklch(35.1% 0.033 260.9), rgb(49, 59, 76).
Aa
White text reads best on this color (11.28:1).
About this color
#313B4C is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.033 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.021 away. White text reads best on it, at 11.28:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.033) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.86:1 |
| White text | 11.28:1 |
Values
| HEX | #313B4C |
| RGB | rgb(49, 59, 76) |
| HSL | hsl(218, 22%, 25%) |
| OKLCH | oklch(35.1% 0.033 260.9) |
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 #313B4C | 11.28:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #313B4C | 1.86:1 | Fails | Lc 7.8 | Not readable |
| #313B4C text on white | 11.28:1 | AAA | Lc 96.1 | Preferred for body text |
| #313B4C text on black | 1.86:1 | 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
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D4D9E2
oklch(88.4% 0.013 262.4)
-
Step 300
300
#B8C1D1
oklch(80.9% 0.025 262.1)
-
Step 400
400
#93A1BA
oklch(70.6% 0.04 262.1)
-
Step 500
500
#788AA8
oklch(63% 0.05 260.6)
-
Step 600
600
#617494
oklch(55.6% 0.055 260.7)
-
Step 700
700
#50617E
oklch(49% 0.051 261)
-
Step 800
800
#424F66
oklch(42.6% 0.042 261.7)
-
Step 900
900 (this color)
#313B4C
oklch(35.1% 0.033 260.9)
-
Step 950
950
#212731
oklch(27.1% 0.021 260.6)
#313B4C 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) | #353C4D | 0.007 |
| Deuteranopia (no green cones) | #32394C | 0.007 |
| Tritanopia (no blue cones) | #293F41 | 0.030 |
| Achromatopsia (no color) | #3B3B3B | 0.033 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313B4C
#313B4C
oklch(35.1% 0.033 260.9)
- #433927
#433927
oklch(35% 0.032 81.9)
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 #313B4C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.021
- Dark Blue Grey #1F3B4D ΔE 0.024
- Charcoal Grey #3C4142 ΔE 0.035
- Gunmetal #293241 ΔE 0.035
- Charcoal #264653 ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.038
- Prussian Blue #1D3557 ΔE 0.042
- Midnight Green #073B4C ΔE 0.043
Use #313B4C 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.