#273F45
Closest named color: Onyx (#343A40). oklch(35.1% 0.031 215.2), rgb(39, 63, 69).
Aa
White text reads best on this color (11.15:1).
About this color
#273F45 is a dark, muted teal or cyan. In OKLCH its lightness is 35%, its chroma 0.031 and its hue 215°. Its hue sits on the cool side of the wheel. The nearest named color is Onyx (#343A40), ΔE 0.022 away. White text reads best on it, at 11.15:1.
| Hue family | Teals and cyans |
| Lightness | dark (35%) |
| Chroma | muted (0.031) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.88:1 |
| White text | 11.15:1 |
Values
| HEX | #273F45 |
| RGB | rgb(39, 63, 69) |
| HSL | hsl(192, 28%, 21%) |
| OKLCH | oklch(35.1% 0.031 215.2) |
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 #273F45 | 11.15:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #273F45 | 1.88:1 | Fails | Lc 8.2 | Not readable |
| #273F45 text on white | 11.15:1 | AAA | Lc 95.7 | Preferred for body text |
| #273F45 text on black | 1.88:1 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBED
oklch(93.6% 0.007 219.6)
-
Step 200
200
#D0DBDE
oklch(88.4% 0.013 215.8)
-
Step 300
300
#B0C5CA
oklch(80.9% 0.024 213.6)
-
Step 400
400
#86A7AF
oklch(70.6% 0.038 214.1)
-
Step 500
500
#68919C
oklch(63.1% 0.048 216.2)
-
Step 600
600
#4E7B87
oklch(55.5% 0.053 216.5)
-
Step 700
700
#3F6872
oklch(49.1% 0.049 215)
-
Step 800
800
#34555D
oklch(42.7% 0.041 214.8)
-
Step 900
900 (this color)
#273F45
oklch(35.1% 0.031 215.2)
-
Step 950
950
#1B292D
oklch(27% 0.02 217.4)
#273F45 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) | #3B3D45 | 0.029 |
| Deuteranopia (no green cones) | #363A45 | 0.026 |
| Tritanopia (no blue cones) | #1B4141 | 0.017 |
| Achromatopsia (no color) | #3B3B3B | 0.032 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #273F45
#273F45
oklch(35.1% 0.031 215.2)
- #4A3530
#4A3530
oklch(35.1% 0.032 33.8)
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 #273F45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.022
- Dark Blue Grey #1F3B4D ΔE 0.025
- Charcoal #264653 ΔE 0.029
- Charcoal Grey #3C4142 ΔE 0.032
- Midnight Green #073B4C ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.040
- Gunmetal #293241 ΔE 0.042
- Dark Teal #014D4E ΔE 0.047
Use #273F45 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.