#283B92
Closest named color: Cobalt (#1E488F). oklch(39.3% 0.145 269.2), rgb(40, 59, 146).
Aa
White text reads best on this color (9.85:1).
About this color
#283B92 is a dark, vivid blue. In OKLCH its lightness is 39%, its chroma 0.145 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.035 away. White text reads best on it, at 9.85:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | vivid (0.145) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.13:1 |
| White text | 9.85:1 |
Values
| HEX | #283B92 |
| RGB | rgb(40, 59, 146) |
| HSL | hsl(229, 57%, 36%) |
| OKLCH | oklch(39.3% 0.145 269.2) |
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 #283B92 | 9.85:1 | AAA | Lc -96.6 | Preferred for body text |
| Black text on #283B92 | 2.13:1 | Fails | Lc 11.5 | Not readable |
| #283B92 text on white | 9.85:1 | AAA | Lc 92.4 | Preferred for body text |
| #283B92 text on black | 2.13:1 | Fails | Lc -10.0 | 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
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E1EAFF
oklch(93.7% 0.03 267.2)
-
Step 200
200
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A8BEFF
oklch(80.9% 0.096 269.8)
-
Step 400
400
#7A9AFF
oklch(70.7% 0.152 269)
-
Step 500
500
#5B7CFF
oklch(63.1% 0.198 269.4)
-
Step 600
600
#3F5BFD
oklch(55.6% 0.241 269.1)
-
Step 700
700
#3348DD
oklch(49% 0.225 269.3)
-
Step 800
800
#2A3DB2
oklch(42.7% 0.185 269.3)
-
Step 900
900 (this color)
#283B92
oklch(39.3% 0.145 269.2)
-
Step 950
950
#152152
oklch(27% 0.091 269.1)
#283B92 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) | #004895 | 0.038 |
| Deuteranopia (no green cones) | #003F90 | 0.028 |
| Tritanopia (no blue cones) | #005160 | 0.118 |
| Achromatopsia (no color) | #434343 | 0.145 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283B92
#283B92
oklch(39.3% 0.145 269.2)
- #574300
#574300
oklch(39.3% 0.08 89.3)
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 #283B92, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.035
- Sapphire #2138AB ΔE 0.042
- Blueberry #464196 ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.049
- Twilight Blue #0A437A ΔE 0.052
- Light Navy #155084 ΔE 0.065
- Dusk Blue #26538D ΔE 0.067
- Indigo Blue #3A18B1 ΔE 0.077
Use #283B92 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.