#283F45
Closest named color: Onyx (#343A40). oklch(35.1% 0.03 215.9), rgb(40, 63, 69).
Aa
White text reads best on this color (11.12:1).
About this color
#283F45 is a dark, muted teal or cyan. In OKLCH its lightness is 35%, its chroma 0.030 and its hue 216°. 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 11.12:1.
| Hue family | Teals and cyans |
| Lightness | dark (35%) |
| Chroma | muted (0.030) |
| Temperature | cool |
| Nearest name | Onyx (#343A40) |
| Black text | 1.88:1 |
| White text | 11.12:1 |
Values
| HEX | #283F45 |
| RGB | rgb(40, 63, 69) |
| HSL | hsl(192, 27%, 21%) |
| OKLCH | oklch(35.1% 0.03 215.9) |
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 #283F45 | 11.12:1 | AAA | Lc -99.5 | Preferred for body text |
| Black text on #283F45 | 1.88:1 | Fails | Lc 8.2 | Not readable |
| #283F45 text on white | 11.12:1 | AAA | Lc 95.7 | Preferred for body text |
| #283F45 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
#B1C5CA
oklch(81% 0.023 214.4)
-
Step 400
400
#87A7AF
oklch(70.7% 0.037 214.6)
-
Step 500
500
#69919C
oklch(63.1% 0.047 216.6)
-
Step 600
600
#507B86
oklch(55.6% 0.05 215.6)
-
Step 700
700
#406872
oklch(49.2% 0.048 215.4)
-
Step 800
800
#35555D
oklch(42.8% 0.04 215.3)
-
Step 900
900 (this color)
#283F45
oklch(35.1% 0.03 215.9)
-
Step 950
950
#1C292C
oklch(27% 0.019 213.5)
#283F45 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) | #3B3E45 | 0.028 |
| Deuteranopia (no green cones) | #363A45 | 0.025 |
| Tritanopia (no blue cones) | #1D4141 | 0.017 |
| Achromatopsia (no color) | #3B3B3B | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283F45
#283F45
oklch(35.1% 0.03 215.9)
- #493530
#493530
oklch(35% 0.03 34.5)
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 #283F45, 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 0.025
- Charcoal #264653 ΔE 0.028
- Charcoal Grey #3C4142 ΔE 0.031
- Midnight Green #073B4C ΔE 0.037
- Dark Grey Blue #29465B ΔE 0.040
- Gunmetal #293241 ΔE 0.043
- Dark Teal #014D4E ΔE 0.048
Use #283F45 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.