#283C70
Closest named color: Twilight Blue (#0A437A). oklch(36.8% 0.093 266.1), rgb(40, 60, 112).
Aa
White text reads best on this color (10.65:1).
About this color
#283C70 is a dark, moderately saturated blue. In OKLCH its lightness is 37%, its chroma 0.093 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.031 away. White text reads best on it, at 10.65:1.
| Hue family | Blues |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.093) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 1.97:1 |
| White text | 10.65:1 |
Values
| HEX | #283C70 |
| RGB | rgb(40, 60, 112) |
| HSL | hsl(223, 47%, 30%) |
| OKLCH | oklch(36.8% 0.093 266.1) |
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 #283C70 | 10.65:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #283C70 | 1.97:1 | Fails | Lc 9.4 | Not readable |
| #283C70 text on white | 10.65:1 | AAA | Lc 94.5 | Preferred for body text |
| #283C70 text on black | 1.97:1 | Fails | Lc -8.1 | 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
#F2F5FC
oklch(97% 0.01 267.4)
-
Step 100
100
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CDD9F4
oklch(88.5% 0.039 266.5)
-
Step 300
300
#ACC0EF
oklch(80.9% 0.07 266.8)
-
Step 400
400
#809EE7
oklch(70.6% 0.113 266.5)
-
Step 500
500
#6185DF
oklch(63.2% 0.142 266)
-
Step 600
600
#486CCD
oklch(55.5% 0.155 266.2)
-
Step 700
700
#3A5AB2
oklch(49.2% 0.145 266.2)
-
Step 800
800
#304A90
oklch(42.7% 0.12 266.1)
-
Step 900
900 (this color)
#283C70
oklch(36.8% 0.093 266.1)
-
Step 950
950
#192543
oklch(27% 0.058 266.1)
#283C70 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) | #244272 | 0.018 |
| Deuteranopia (no green cones) | #193B6F | 0.017 |
| Tritanopia (no blue cones) | #004850 | 0.081 |
| Achromatopsia (no color) | #3E3E3E | 0.093 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283C70
#283C70
oklch(36.8% 0.093 266.1)
- #513C00
#513C00
oklch(36.9% 0.076 86.3)
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 #283C70, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.031
- Marine Blue #01386A ΔE 0.038
- Prussian Blue #1D3557 ΔE 0.049
- Dark Grey Blue #29465B ΔE 0.053
- Cobalt #1E488F ΔE 0.058
- Light Navy #155084 ΔE 0.062
- Dark Blue Grey #1F3B4D ΔE 0.063
- Marine #042E60 ΔE 0.064
Use #283C70 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.