#283B59
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.1% 0.058 259.3), rgb(40, 59, 89).
Aa
White text reads best on this color (11.28:1).
About this color
#283B59 is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.058 and its hue 259°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.025 away. White text reads best on it, at 11.28:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.058) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.86:1 |
| White text | 11.28:1 |
Values
| HEX | #283B59 |
| RGB | rgb(40, 59, 89) |
| HSL | hsl(217, 38%, 25%) |
| OKLCH | oklch(35.1% 0.058 259.3) |
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 #283B59 | 11.28:1 | AAA | Lc -99.7 | Preferred for body text |
| Black text on #283B59 | 1.86:1 | Fails | Lc 7.9 | Not readable |
| #283B59 text on white | 11.28:1 | AAA | Lc 96.0 | Preferred for body text |
| #283B59 text on black | 1.86:1 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF3
oklch(93.6% 0.013 262.4)
-
Step 200
200
#D0DAEA
oklch(88.6% 0.025 259.8)
-
Step 300
300
#B0C2DD
oklch(80.9% 0.043 258.4)
-
Step 400
400
#87A2CD
oklch(70.8% 0.07 259.6)
-
Step 500
500
#698AC0
oklch(63.1% 0.09 260)
-
Step 600
600
#5074AC
oklch(55.7% 0.097 259)
-
Step 700
700
#416194
oklch(49.2% 0.091 259.4)
-
Step 800
800
#364F78
oklch(42.7% 0.075 259.9)
-
Step 900
900 (this color)
#283B59
oklch(35.1% 0.058 259.3)
-
Step 950
950
#1B2738
oklch(27% 0.036 257.1)
#283B59 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) | #2F3D5A | 0.012 |
| Deuteranopia (no green cones) | #2A3858 | 0.009 |
| Tritanopia (no blue cones) | #114246 | 0.052 |
| Achromatopsia (no color) | #3A3A3A | 0.058 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283B59
#283B59
oklch(35.1% 0.058 259.3)
- #4B3713
#4B3713
oklch(35.1% 0.058 79.4)
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 #283B59, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.025
- Prussian Blue #1D3557 ΔE 0.025
- Dark Grey Blue #29465B ΔE 0.035
- Midnight Green #073B4C ΔE 0.040
- Charcoal #264653 ΔE 0.040
- Gunmetal #293241 ΔE 0.046
- Onyx #343A40 ΔE 0.046
- Marine Blue #01386A ΔE 0.046
Use #283B59 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.