#283C4F
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.8% 0.042 247.9), rgb(40, 60, 79).
Aa
White text reads best on this color (11.35:1).
About this color
#283C4F is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.042 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.013 away. White text reads best on it, at 11.35:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.84:1 |
| White text | 11.35:1 |
Values
| HEX | #283C4F |
| RGB | rgb(40, 60, 79) |
| HSL | hsl(209, 33%, 23%) |
| OKLCH | oklch(34.8% 0.042 247.9) |
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 #283C4F | 11.35:1 | AAA | Lc -99.9 | Preferred for body text |
| Black text on #283C4F | 1.84:1 | Fails | Lc 7.7 | Not readable |
| #283C4F text on white | 11.35:1 | AAA | Lc 96.1 | Preferred for body text |
| #283C4F text on black | 1.84:1 | 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
#E5EAF0
oklch(93.5% 0.01 252.8)
-
Step 200
200
#D0DAE4
oklch(88.4% 0.018 248)
-
Step 300
300
#B1C3D4
oklch(80.9% 0.031 246.7)
-
Step 400
400
#88A4BF
oklch(70.7% 0.05 247.6)
-
Step 500
500
#6A8DAF
oklch(63% 0.065 248.2)
-
Step 600
600
#51779B
oklch(55.6% 0.071 247.9)
-
Step 700
700
#426484
oklch(49.1% 0.065 247.8)
-
Step 800
800
#37526B
oklch(42.8% 0.053 247.3)
-
Step 900
900 (this color)
#283C4F
oklch(34.8% 0.042 247.9)
-
Step 950
950
#1C2833
oklch(27.1% 0.026 246.6)
#283C4F 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) | #343C50 | 0.017 |
| Deuteranopia (no green cones) | #2F384F | 0.015 |
| Tritanopia (no blue cones) | #184042 | 0.036 |
| Achromatopsia (no color) | #3A3A3A | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283C4F
#283C4F
oklch(34.8% 0.042 247.9)
- #493621
#493621
oklch(34.9% 0.043 68.4)
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 #283C4F, 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 0.029
- Midnight Green #073B4C ΔE 0.031
- Charcoal #264653 ΔE 0.032
- Prussian Blue #1D3557 ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.034
- Gunmetal #293241 ΔE 0.036
- Charcoal Grey #3C4142 ΔE 0.043
Use #283C4F 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.