#273B37
Closest named color: Onyx (#343A40). oklch(33.4% 0.027 180.8), rgb(39, 59, 55).
Aa
White text reads best on this color (11.88:1).
About this color
#273B37 is a dark close to neutral grey. In OKLCH its lightness is 33%, its chroma 0.027. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.027 away. White text reads best on it, at 11.88:1.
| Hue family | Neutrals |
| Lightness | dark (33%) |
| Chroma | close to neutral grey (0.027) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.76:1 |
| White text | 11.88:1 |
Values
| HEX | #273B37 |
| RGB | rgb(39, 59, 55) |
| HSL | hsl(168, 20%, 19%) |
| OKLCH | oklch(33.4% 0.027 180.8) |
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 #273B37 | 11.88:1 | AAA | Lc -100.8 | Preferred for body text |
| Black text on #273B37 | 1.76:1 | Fails | Lc 0.0 | Not readable |
| #273B37 text on white | 11.88:1 | AAA | Lc 97.2 | Preferred for body text |
| #273B37 text on black | 1.76:1 | 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
#E6EBEA
oklch(93.6% 0.006 183)
-
Step 200
200
#D2DCD9
oklch(88.6% 0.012 176.3)
-
Step 300
300
#B4C5C1
oklch(80.9% 0.019 180.1)
-
Step 400
400
#8CA7A1
oklch(70.6% 0.031 180.4)
-
Step 500
500
#6F928B
oklch(63.2% 0.04 181.3)
-
Step 600
600
#567C75
oklch(55.6% 0.044 181.9)
-
Step 700
700
#466962
oklch(49.2% 0.042 180.6)
-
Step 800
800
#3A5550
oklch(42.6% 0.034 181.9)
-
Step 900
900 (this color)
#273B37
oklch(33.4% 0.027 180.8)
-
Step 950
950
#1E2927
oklch(27% 0.016 182.8)
#273B37 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) | #393937 | 0.028 |
| Deuteranopia (no green cones) | #363637 | 0.027 |
| Tritanopia (no blue cones) | #213C3A | 0.008 |
| Achromatopsia (no color) | #373737 | 0.027 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273B37
#273B37
oklch(33.4% 0.027 180.8)
- #423136
#423136
oklch(33.4% 0.026 359.2)
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 #273B37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.027
- Dark Blue Grey #1F3B4D ΔE 0.040
- Gunmetal #293241 ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.043
- Midnight Green #073B4C ΔE 0.044
- Pakistan Green #283618 ΔE 0.047
- Charcoal #264653 ΔE 0.052
- Space Cadet #2B2D42 ΔE 0.057
Use #273B37 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.