#283D95
Closest named color: Cobalt (#1E488F). oklch(40% 0.147 268.6), rgb(40, 61, 149).
Aa
White text reads best on this color (9.58:1).
About this color
#283D95 is a dark, vivid blue. In OKLCH its lightness is 40%, its chroma 0.147 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Cobalt (#1E488F), ΔE 0.032 away. White text reads best on it, at 9.58:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | vivid (0.147) |
| Temperature | cool |
| Nearest name | Cobalt (#1E488F) |
| Black text | 2.19:1 |
| White text | 9.58:1 |
Values
| HEX | #283D95 |
| RGB | rgb(40, 61, 149) |
| HSL | hsl(228, 58%, 37%) |
| OKLCH | oklch(40% 0.147 268.6) |
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 #283D95 | 9.58:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #283D95 | 2.19:1 | Fails | Lc 12.2 | Not readable |
| #283D95 text on white | 9.58:1 | AAA | Lc 91.7 | Preferred for body text |
| #283D95 text on black | 2.19:1 | Fails | Lc -10.7 | 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
#CAD8FF
oklch(88.4% 0.056 269.7)
-
Step 300
300
#A7BFFF
oklch(81% 0.095 268.4)
-
Step 400
400
#799AFF
oklch(70.6% 0.153 268.6)
-
Step 500
500
#597DFF
oklch(63.2% 0.197 268.6)
-
Step 600
600
#3D5AFF
oklch(55.6% 0.245 268.8)
-
Step 700
700
#3048DE
oklch(49% 0.227 268.6)
-
Step 800
800
#283DB4
oklch(42.8% 0.188 268.7)
-
Step 900
900 (this color)
#283D95
oklch(40% 0.147 268.6)
-
Step 950
950
#142153
oklch(27% 0.093 268.5)
#283D95 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) | #004A98 | 0.038 |
| Deuteranopia (no green cones) | #004093 | 0.027 |
| Tritanopia (no blue cones) | #005363 | 0.117 |
| Achromatopsia (no color) | #454545 | 0.147 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283D95
#283D95
oklch(40% 0.147 268.6)
- #594400
#594400
oklch(39.8% 0.081 88.6)
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 #283D95, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Cobalt #1E488F ΔE 0.032
- Sapphire #2138AB ΔE 0.039
- Blueberry #464196 ΔE 0.045
- Dark Slate Blue #483D8B ΔE 0.049
- Twilight Blue #0A437A ΔE 0.055
- Light Navy #155084 ΔE 0.063
- Dusk Blue #26538D ΔE 0.063
- Deep Sea Blue #015482 ΔE 0.076
Use #283D95 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.