#283F92
Closest named color: Cobalt (#1E488F). oklch(40.1% 0.14 267.8), rgb(40, 63, 146).
Aa
White text reads best on this color (9.47:1).
About this color
#283F92 is a dark, moderately saturated blue. In OKLCH its lightness is 40%, its chroma 0.140 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.025 away. White text reads best on it, at 9.47:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.140) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.21:1 |
| White text | 9.47:1 |
Values
| HEX | #283F92 |
| RGB | rgb(40, 63, 146) |
| HSL | hsl(227, 57%, 36%) |
| OKLCH | oklch(40.1% 0.14 267.8) |
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 #283F92 | 9.47:1 | AAA | Lc -95.8 | Preferred for body text |
| Black text on #283F92 | 2.21:1 | Fails | Lc 12.5 | Not readable |
| #283F92 text on white | 9.47:1 | AAA | Lc 91.5 | Preferred for body text |
| #283F92 text on black | 2.21:1 | Fails | Lc -10.9 | 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
#F1F5FF
oklch(97% 0.014 268.5)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#C9D9FF
oklch(88.6% 0.055 267.2)
-
Step 300
300
#A6BFFF
oklch(80.9% 0.095 267.8)
-
Step 400
400
#789BFF
oklch(70.8% 0.152 267.9)
-
Step 500
500
#567DFF
oklch(63% 0.198 267.8)
-
Step 600
600
#3B5EF9
oklch(55.6% 0.233 267.8)
-
Step 700
700
#2F4CD9
oklch(49.2% 0.217 267.9)
-
Step 800
800
#2640AF
oklch(42.8% 0.179 267.6)
-
Step 900
900 (this color)
#283F92
oklch(40.1% 0.14 267.8)
-
Step 950
950
#142251
oklch(27.1% 0.088 267.6)
#283F92 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) | #004B95 | 0.036 |
| Deuteranopia (no green cones) | #004190 | 0.027 |
| Tritanopia (no blue cones) | #005362 | 0.112 |
| Achromatopsia (no color) | #464646 | 0.140 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283F92
#283F92
oklch(40.1% 0.14 267.8)
- #5A4500
#5A4500
oklch(40.2% 0.082 88.8)
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 #283F92, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.025
- Blueberry #464196 ΔE 0.043
- Sapphire #2138AB ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.046
- Twilight Blue #0A437A ΔE 0.049
- Light Navy #155084 ΔE 0.056
- Dusk Blue #26538D ΔE 0.057
- Deep Sea Blue #015482 ΔE 0.070
Use #283F92 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.