#31404A
Closest named color: Onyx (#343A40). oklch(36.2% 0.026 237.6), rgb(49, 64, 74).
Aa
White text reads best on this color (10.69:1).
About this color
#31404A is a dark close to neutral grey. In OKLCH its lightness is 36%, its chroma 0.026. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.022 away. White text reads best on it, at 10.69:1.
| Hue family | Neutrals |
| Lightness | dark (36%) |
| Chroma | close to neutral grey (0.026) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.96:1 |
| White text | 10.69:1 |
Values
| HEX | #31404A |
| RGB | rgb(49, 64, 74) |
| HSL | hsl(204, 20%, 24%) |
| OKLCH | oklch(36.2% 0.026 237.6) |
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 #31404A | 10.69:1 | AAA | Lc -98.7 | Preferred for body text |
| Black text on #31404A | 1.96:1 | Fails | Lc 9.1 | Not readable |
| #31404A text on white | 10.69:1 | AAA | Lc 94.8 | Preferred for body text |
| #31404A text on black | 1.96:1 | Fails | Lc -7.8 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E6EAED
oklch(93.5% 0.006 239.8)
-
Step 200
200
#D3DADF
oklch(88.4% 0.01 238.5)
-
Step 300
300
#B5C3CC
oklch(80.9% 0.02 235.8)
-
Step 400
400
#8FA4B2
oklch(70.7% 0.031 237.1)
-
Step 500
500
#738E9F
oklch(63.2% 0.04 235.9)
-
Step 600
600
#5B778A
oklch(55.5% 0.044 238.3)
-
Step 700
700
#4B6475
oklch(49% 0.04 238.4)
-
Step 800
800
#3E525F
oklch(42.7% 0.033 237)
-
Step 900
900 (this color)
#31404A
oklch(36.2% 0.026 237.6)
-
Step 950
950
#1F282E
oklch(27.1% 0.017 237.4)
#31404A 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) | #3C404B | 0.017 |
| Deuteranopia (no green cones) | #383D4A | 0.014 |
| Tritanopia (no blue cones) | #294343 | 0.021 |
| Achromatopsia (no color) | #3E3E3E | 0.026 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #31404A
#31404A
oklch(36.2% 0.026 237.6)
- #493B30
#493B30
oklch(36.4% 0.027 60)
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 #31404A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.022
- Charcoal Grey #3C4142 ΔE 0.022
- Charcoal #264653 ΔE 0.023
- Dark Grey Blue #29465B ΔE 0.030
- Dark Blue Grey #1F3B4D ΔE 0.031
- Midnight Green #073B4C ΔE 0.047
- Dark Slate Gray #2F4F4F ΔE 0.048
- Gunmetal #293241 ΔE 0.048
Use #31404A 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.