#283D45
Closest named color: Onyx (#343A40). oklch(34.6% 0.03 223.7), rgb(40, 61, 69).
Aa
White text reads best on this color (11.39:1).
About this color
#283D45 is a dark close to neutral grey. In OKLCH its lightness is 35%, its chroma 0.030. It has too little chroma to lean warm or cool. The nearest named color is Onyx (#343A40), ΔE 0.019 away. White text reads best on it, at 11.39:1.
| Hue family | Neutrals |
| Lightness | dark (35%) |
| Chroma | close to neutral grey (0.030) |
| Temperature | neutral |
| Nearest name | Onyx (#343A40) |
| Black text | 1.84:1 |
| White text | 11.39:1 |
Values
| HEX | #283D45 |
| RGB | rgb(40, 61, 69) |
| HSL | hsl(197, 27%, 21%) |
| OKLCH | oklch(34.6% 0.03 223.7) |
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 #283D45 | 11.39:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #283D45 | 1.84:1 | Fails | Lc 7.7 | Not readable |
| #283D45 text on white | 11.39:1 | AAA | Lc 96.2 | Preferred for body text |
| #283D45 text on black | 1.84:1 | 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
#D1DBDF
oklch(88.5% 0.012 223.5)
-
Step 300
300
#B2C4CB
oklch(80.9% 0.022 223.1)
-
Step 400
400
#89A6B1
oklch(70.7% 0.036 222.8)
-
Step 500
500
#6B909E
oklch(63.1% 0.046 223.2)
-
Step 600
600
#527A89
oklch(55.6% 0.05 223.5)
-
Step 700
700
#436774
oklch(49.2% 0.046 222.7)
-
Step 800
800
#37545F
oklch(42.8% 0.039 223.7)
-
Step 900
900 (this color)
#283D45
oklch(34.6% 0.03 223.7)
-
Step 950
950
#1C292D
oklch(27.1% 0.019 218.7)
#283D45 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) | #383C45 | 0.023 |
| Deuteranopia (no green cones) | #343845 | 0.023 |
| Tritanopia (no blue cones) | #1D403F | 0.021 |
| Achromatopsia (no color) | #3A3A3A | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283D45
#283D45
oklch(34.6% 0.03 223.7)
- #47352D
#47352D
oklch(34.7% 0.029 45.1)
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 #283D45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Onyx #343A40 ΔE 0.019
- Dark Blue Grey #1F3B4D ΔE 0.020
- Charcoal #264653 ΔE 0.033
- Midnight Green #073B4C ΔE 0.033
- Charcoal Grey #3C4142 ΔE 0.034
- Gunmetal #293241 ΔE 0.036
- Dark Grey Blue #29465B ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.049
Use #283D45 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.