#283D51
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.2% 0.044 248), rgb(40, 61, 81).
Aa
White text reads best on this color (11.19:1).
About this color
#283D51 is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.044 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.015 away. White text reads best on it, at 11.19:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.044) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.87:1 |
| White text | 11.19:1 |
Values
| HEX | #283D51 |
| RGB | rgb(40, 61, 81) |
| HSL | hsl(209, 34%, 24%) |
| OKLCH | oklch(35.2% 0.044 248) |
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 #283D51 | 11.19:1 | AAA | Lc -99.6 | Preferred for body text |
| Black text on #283D51 | 1.87:1 | Fails | Lc 8.1 | Not readable |
| #283D51 text on white | 11.19:1 | AAA | Lc 95.8 | Preferred for body text |
| #283D51 text on black | 1.87:1 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBF0
oklch(93.7% 0.009 242.8)
-
Step 200
200
#D0DAE5
oklch(88.4% 0.019 250.6)
-
Step 300
300
#B0C3D5
oklch(80.8% 0.033 246.8)
-
Step 400
400
#87A4C1
oklch(70.7% 0.053 248.6)
-
Step 500
500
#698DB1
oklch(63% 0.068 248.9)
-
Step 600
600
#50779D
oklch(55.6% 0.074 248.7)
-
Step 700
700
#406486
oklch(49.1% 0.069 248)
-
Step 800
800
#35526D
oklch(42.8% 0.057 247.6)
-
Step 900
900 (this color)
#283D51
oklch(35.2% 0.044 248)
-
Step 950
950
#1B2834
oklch(27.1% 0.029 246.9)
#283D51 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) | #353D52 | 0.019 |
| Deuteranopia (no green cones) | #303951 | 0.016 |
| Tritanopia (no blue cones) | #174244 | 0.038 |
| Achromatopsia (no color) | #3B3B3B | 0.044 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283D51
#283D51
oklch(35.2% 0.044 248)
- #4A3721
#4A3721
oklch(35.2% 0.044 69.7)
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 #283D51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.015
- Charcoal #264653 ΔE 0.029
- Dark Grey Blue #29465B ΔE 0.030
- Onyx #343A40 ΔE 0.031
- Midnight Green #073B4C ΔE 0.033
- Prussian Blue #1D3557 ΔE 0.035
- Gunmetal #293241 ΔE 0.040
- Charcoal Grey #3C4142 ΔE 0.043
Use #283D51 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.