#283A45
Closest named color: Dark Blue Grey (#1F3B4D). oklch(33.8% 0.03 235.7), rgb(40, 58, 69).
Aa
White text reads best on this color (11.78:1).
About this color
#283A45 is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.030 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.016 away. White text reads best on it, at 11.78:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.030) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.78:1 |
| White text | 11.78:1 |
Values
| HEX | #283A45 |
| RGB | rgb(40, 58, 69) |
| HSL | hsl(203, 27%, 21%) |
| OKLCH | oklch(33.8% 0.03 235.7) |
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 #283A45 | 11.78:1 | AAA | Lc -100.6 | Preferred for body text |
| Black text on #283A45 | 1.78:1 | Fails | Lc 0.0 | Not readable |
| #283A45 text on white | 11.78:1 | AAA | Lc 97.0 | Preferred for body text |
| #283A45 text on black | 1.78:1 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E6EBEE
oklch(93.7% 0.007 233.6)
-
Step 200
200
#D2DBE0
oklch(88.6% 0.012 231.7)
-
Step 300
300
#B3C3CD
oklch(80.8% 0.023 235.1)
-
Step 400
400
#8CA5B4
oklch(70.8% 0.035 234.3)
-
Step 500
500
#6F8EA2
oklch(63% 0.046 236.8)
-
Step 600
600
#56788D
oklch(55.5% 0.051 236)
-
Step 700
700
#466578
oklch(49% 0.047 235.9)
-
Step 800
800
#3A5362
oklch(42.8% 0.039 235.2)
-
Step 900
900 (this color)
#283A45
oklch(33.8% 0.03 235.7)
-
Step 950
950
#1D282F
oklch(27% 0.02 236.4)
#283A45 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) | #353946 | 0.020 |
| Deuteranopia (no green cones) | #313645 | 0.018 |
| Tritanopia (no blue cones) | #1E3D3E | 0.022 |
| Achromatopsia (no color) | #383838 | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283A45
#283A45
oklch(33.8% 0.03 235.7)
- #443328
#443328
oklch(33.7% 0.031 54.3)
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 #283A45, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.016
- Onyx #343A40 ΔE 0.019
- Gunmetal #293241 ΔE 0.026
- Midnight Green #073B4C ΔE 0.031
- Charcoal #264653 ΔE 0.040
- Charcoal Grey #3C4142 ΔE 0.041
- Space Cadet #2B2D42 ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.042
Use #283A45 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.