#283C4A
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.5% 0.035 239.6), rgb(40, 60, 74).
Aa
White text reads best on this color (11.44:1).
About this color
#283C4A is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.035 and its hue 240°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.013 away. White text reads best on it, at 11.44:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.83:1 |
| White text | 11.44:1 |
Values
| HEX | #283C4A |
| RGB | rgb(40, 60, 74) |
| HSL | hsl(205, 30%, 22%) |
| OKLCH | oklch(34.5% 0.035 239.6) |
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 #283C4A | 11.44:1 | AAA | Lc -100.0 | Preferred for body text |
| Black text on #283C4A | 1.83:1 | Fails | Lc 7.6 | Not readable |
| #283C4A text on white | 11.44:1 | AAA | Lc 96.3 | Preferred for body text |
| #283C4A text on black | 1.83:1 | 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
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D1DBE2
oklch(88.6% 0.015 238)
-
Step 300
300
#B2C3D0
oklch(80.8% 0.026 240.7)
-
Step 400
400
#89A5B9
oklch(70.8% 0.043 239.3)
-
Step 500
500
#6B8EA7
oklch(63% 0.054 239.8)
-
Step 600
600
#537893
oklch(55.6% 0.059 240.8)
-
Step 700
700
#43657D
oklch(49.1% 0.055 240.1)
-
Step 800
800
#375366
oklch(42.8% 0.046 238.9)
-
Step 900
900 (this color)
#283C4A
oklch(34.5% 0.035 239.6)
-
Step 950
950
#1C2830
oklch(26.9% 0.022 237.9)
#283C4A 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) | #363C4B | 0.021 |
| Deuteranopia (no green cones) | #31384A | 0.017 |
| Tritanopia (no blue cones) | #1B4041 | 0.028 |
| Achromatopsia (no color) | #3A3A3A | 0.036 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283C4A
#283C4A
oklch(34.5% 0.035 239.6)
- #473527
#473527
oklch(34.5% 0.035 59.2)
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 #283C4A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.013
- Onyx #343A40 ΔE 0.022
- Midnight Green #073B4C ΔE 0.030
- Charcoal #264653 ΔE 0.032
- Gunmetal #293241 ΔE 0.033
- Dark Grey Blue #29465B ΔE 0.038
- Charcoal Grey #3C4142 ΔE 0.039
- Prussian Blue #1D3557 ΔE 0.040
Use #283C4A 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.