#283D55
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.4% 0.05 252.5), rgb(40, 61, 85).
Aa
White text reads best on this color (11.11:1).
About this color
#283D55 is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.050 and its hue 252°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.019 away. White text reads best on it, at 11.11:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.050) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.88:1 |
| White text | 11.11:1 |
Values
| HEX | #283D55 |
| RGB | rgb(40, 61, 85) |
| HSL | hsl(212, 36%, 25%) |
| OKLCH | oklch(35.4% 0.05 252.5) |
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 #283D55 | 11.11:1 | AAA | Lc -99.4 | Preferred for body text |
| Black text on #283D55 | 1.88:1 | Fails | Lc 8.3 | Not readable |
| #283D55 text on white | 11.11:1 | AAA | Lc 95.6 | Preferred for body text |
| #283D55 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EAF1
oklch(93.5% 0.011 256.7)
-
Step 200
200
#D0DAE7
oklch(88.5% 0.021 254.9)
-
Step 300
300
#B0C3D9
oklch(81% 0.037 252.1)
-
Step 400
400
#86A3C6
oklch(70.6% 0.061 253.4)
-
Step 500
500
#688CB7
oklch(63% 0.077 253.3)
-
Step 600
600
#4F76A3
oklch(55.6% 0.083 252.8)
-
Step 700
700
#3F638C
oklch(49.1% 0.078 252.6)
-
Step 800
800
#355171
oklch(42.7% 0.063 252.5)
-
Step 900
900 (this color)
#283D55
oklch(35.4% 0.05 252.5)
-
Step 950
950
#1B2736
oklch(26.9% 0.033 254.4)
#283D55 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) | #343E56 | 0.018 |
| Deuteranopia (no green cones) | #2E3A55 | 0.012 |
| Tritanopia (no blue cones) | #144245 | 0.043 |
| Achromatopsia (no color) | #3B3B3B | 0.050 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283D55
#283D55
oklch(35.4% 0.05 252.5)
- #4C371C
#4C371C
oklch(35.4% 0.051 71.9)
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 #283D55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.019
- Dark Grey Blue #29465B ΔE 0.029
- Charcoal #264653 ΔE 0.031
- Prussian Blue #1D3557 ΔE 0.032
- Midnight Green #073B4C ΔE 0.036
- Onyx #343A40 ΔE 0.038
- Gunmetal #293241 ΔE 0.044
- Charcoal Grey #3C4142 ΔE 0.048
Use #283D55 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.