#313F3D
Closest named color: Onyx (#343A40). oklch(35.5% 0.019 185.7), rgb(49, 63, 61).
Aa
White text reads best on this color (11.00:1).
About this color
#313F3D is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.019. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.020 away. White text reads best on it, at 11.00:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.019) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.90:1 |
| White text | 11.00:1 |
Values
| HEX | #313F3D |
| RGB | rgb(49, 63, 61) |
| HSL | hsl(171, 13%, 22%) |
| OKLCH | oklch(35.5% 0.019 185.7) |
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 #313F3D | 11.00:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #313F3D | 1.90:1 | Fails | Lc 8.4 | Not readable |
| #313F3D text on white | 11.00:1 | AAA | Lc 95.5 | Preferred for body text |
| #313F3D text on black | 1.90:1 | 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
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E7EBEA
oklch(93.7% 0.004 179.7)
-
Step 200
200
#D4DBDA
oklch(88.6% 0.008 186.9)
-
Step 300
300
#B7C4C2
oklch(81% 0.015 185.9)
-
Step 400
400
#92A5A2
oklch(70.6% 0.022 185.2)
-
Step 500
500
#778F8C
oklch(63% 0.028 187.2)
-
Step 600
600
#5F7A76
oklch(55.7% 0.032 185.2)
-
Step 700
700
#4F6663
oklch(49.1% 0.028 186.5)
-
Step 800
800
#415351
oklch(42.6% 0.023 188)
-
Step 900
900 (this color)
#313F3D
oklch(35.5% 0.019 185.7)
-
Step 950
950
#202827
oklch(26.9% 0.011 187.3)
#313F3D 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) | #3E3D3D | 0.021 |
| Deuteranopia (no green cones) | #3B3B3D | 0.020 |
| Tritanopia (no blue cones) | #2D403E | 0.006 |
| Achromatopsia (no color) | #3C3C3C | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #313F3D
#313F3D
oklch(35.5% 0.019 185.7)
- #45383A
#45383A
oklch(35.5% 0.019 7.6)
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 #313F3D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.020
- Charcoal Grey #3C4142 ΔE 0.021
- Charcoal #264653 ΔE 0.038
- Dark Blue Grey #1F3B4D ΔE 0.041
- Gunmetal #293241 ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.050
- Dark Slate Gray #2F4F4F ΔE 0.052
- Midnight Green #073B4C ΔE 0.053
Use #313F3D 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.