#283D7B
Closest named color: Twilight Blue (#0A437A). oklch(37.9% 0.109 267.1), rgb(40, 61, 123).
Aa
White text reads best on this color (10.27:1).
About this color
#283D7B is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.109 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.027 away. White text reads best on it, at 10.27:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.109) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.04:1 |
| White text | 10.27:1 |
Values
| HEX | #283D7B |
| RGB | rgb(40, 61, 123) |
| HSL | hsl(225, 51%, 32%) |
| OKLCH | oklch(37.9% 0.109 267.1) |
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 #283D7B | 10.27:1 | AAA | Lc -97.7 | Preferred for body text |
| Black text on #283D7B | 2.04:1 | Fails | Lc 10.3 | Not readable |
| #283D7B text on white | 10.27:1 | AAA | Lc 93.6 | Preferred for body text |
| #283D7B text on black | 2.04:1 | Fails | Lc -8.9 | 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
#F2F5FD
oklch(97% 0.011 269.6)
-
Step 100
100
#E3EAFA
oklch(93.6% 0.023 266.9)
-
Step 200
200
#CCD9F8
oklch(88.5% 0.045 267.4)
-
Step 300
300
#A9C0F6
oklch(81% 0.081 266.7)
-
Step 400
400
#7C9DF2
oklch(70.7% 0.13 267)
-
Step 500
500
#5C82ED
oklch(63.1% 0.166 266.9)
-
Step 600
600
#4468DC
oklch(55.6% 0.182 267.2)
-
Step 700
700
#3656BF
oklch(49.1% 0.169 267.1)
-
Step 800
800
#2D479A
oklch(42.7% 0.139 267.2)
-
Step 900
900 (this color)
#283D7B
oklch(37.9% 0.109 267.1)
-
Step 950
950
#172448
oklch(27% 0.069 266.8)
#283D7B 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) | #1C457D | 0.024 |
| Deuteranopia (no green cones) | #093D7A | 0.026 |
| Tritanopia (no blue cones) | #004B56 | 0.090 |
| Achromatopsia (no color) | #414141 | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283D7B
#283D7B
oklch(37.9% 0.109 267.1)
- #543F00
#543F00
oklch(38% 0.078 87.2)
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 #283D7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.027
- Cobalt #1E488F ΔE 0.042
- Marine Blue #01386A ΔE 0.048
- Light Navy #155084 ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.055
- Blueberry #464196 ΔE 0.064
- Dusk Blue #26538D ΔE 0.066
- Prussian Blue #1D3557 ΔE 0.067
Use #283D7B 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.