#283F4C
Closest named color: Dark Blue Grey (#1F3B4D). oklch(35.4% 0.037 234), rgb(40, 63, 76).
Aa
White text reads best on this color (11.02:1).
About this color
#283F4C is a dark, muted blue. In OKLCH its lightness is 35%, its chroma 0.037 and its hue 234°. 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 11.02:1.
| Hue family | Blues |
| Lightness | dark (35%) |
| Chroma | muted (0.037) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.90:1 |
| White text | 11.02:1 |
Values
| HEX | #283F4C |
| RGB | rgb(40, 63, 76) |
| HSL | hsl(202, 31%, 23%) |
| OKLCH | oklch(35.4% 0.037 234) |
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 #283F4C | 11.02:1 | AAA | Lc -99.3 | Preferred for body text |
| Black text on #283F4C | 1.90:1 | Fails | Lc 8.5 | Not readable |
| #283F4C text on white | 11.02:1 | AAA | Lc 95.4 | Preferred for body text |
| #283F4C text on black | 1.90:1 | 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
#F3F6F7
oklch(97.1% 0.003 219.5)
-
Step 100
100
#E5EBEE
oklch(93.6% 0.008 228.9)
-
Step 200
200
#D0DBE2
oklch(88.5% 0.015 235.4)
-
Step 300
300
#B0C4D0
oklch(80.9% 0.028 234.1)
-
Step 400
400
#86A6B8
oklch(70.7% 0.044 232.8)
-
Step 500
500
#6890A7
oklch(63.2% 0.056 234)
-
Step 600
600
#4E7A92
oklch(55.7% 0.061 233.3)
-
Step 700
700
#3F667C
oklch(49% 0.057 234.3)
-
Step 800
800
#345365
oklch(42.6% 0.047 234.9)
-
Step 900
900 (this color)
#283F4C
oklch(35.4% 0.037 234)
-
Step 950
950
#1B2830
oklch(26.9% 0.023 235.8)
#283F4C 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) | #393E4D | 0.025 |
| Deuteranopia (no green cones) | #343A4C | 0.022 |
| Tritanopia (no blue cones) | #194243 | 0.027 |
| Achromatopsia (no color) | #3C3C3C | 0.037 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283F4C
#283F4C
oklch(35.4% 0.037 234)
- #4B3729
#4B3729
oklch(35.5% 0.037 56.2)
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 #283F4C, 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
- Charcoal #264653 ΔE 0.023
- Onyx #343A40 ΔE 0.026
- Dark Grey Blue #29465B ΔE 0.030
- Midnight Green #073B4C ΔE 0.034
- Charcoal Grey #3C4142 ΔE 0.035
- Gunmetal #293241 ΔE 0.042
- Prussian Blue #1D3557 ΔE 0.046
Use #283F4C 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.