#283D7C
Closest named color: Twilight Blue (#0A437A). oklch(37.9% 0.11 267.2), rgb(40, 61, 124).
Aa
White text reads best on this color (10.25:1).
About this color
#283D7C is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.110 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 10.25:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.110) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.04:1 |
| White text | 10.25:1 |
Values
| HEX | #283D7C |
| RGB | rgb(40, 61, 124) |
| HSL | hsl(225, 51%, 32%) |
| OKLCH | oklch(37.9% 0.11 267.2) |
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 #283D7C | 10.25:1 | AAA | Lc -97.6 | Preferred for body text |
| Black text on #283D7C | 2.04:1 | Fails | Lc 10.4 | Not readable |
| #283D7C text on white | 10.25:1 | AAA | Lc 93.5 | Preferred for body text |
| #283D7C text on black | 2.04:1 | Fails | Lc -9.0 | 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
#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
#A9C0F7
oklch(81% 0.082 266.9)
-
Step 400
400
#7C9DF3
oklch(70.8% 0.132 267.1)
-
Step 500
500
#5C81EE
oklch(63% 0.169 267.3)
-
Step 600
600
#4468DD
oklch(55.6% 0.183 267.3)
-
Step 700
700
#3656C0
oklch(49.2% 0.17 267.1)
-
Step 800
800
#2D479B
oklch(42.8% 0.141 267.2)
-
Step 900
900 (this color)
#283D7C
oklch(37.9% 0.11 267.2)
-
Step 950
950
#172448
oklch(27% 0.069 266.8)
#283D7C 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) | #1B457E | 0.024 |
| Deuteranopia (no green cones) | #073D7B | 0.027 |
| Tritanopia (no blue cones) | #004C56 | 0.093 |
| Achromatopsia (no color) | #414141 | 0.110 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283D7C
#283D7C
oklch(37.9% 0.11 267.2)
- #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 #283D7C, 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 0.041
- Marine Blue #01386A ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.054
- Light Navy #155084 ΔE 0.054
- Blueberry #464196 ΔE 0.063
- Dusk Blue #26538D ΔE 0.066
- Deep Sea Blue #015482 ΔE 0.067
Use #283D7C 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.