#283D7F
Closest named color: Twilight Blue (#0A437A). oklch(38.2% 0.115 267.5), rgb(40, 61, 127).
Aa
White text reads best on this color (10.17:1).
About this color
#283D7F is a dark, moderately saturated blue. In OKLCH its lightness is 38%, its chroma 0.115 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Twilight Blue (#0A437A), ΔE 0.029 away. White text reads best on it, at 10.17:1.
| Hue family | Blues |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.115) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.06:1 |
| White text | 10.17:1 |
Values
| HEX | #283D7F |
| RGB | rgb(40, 61, 127) |
| HSL | hsl(226, 52%, 33%) |
| OKLCH | oklch(38.2% 0.115 267.5) |
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 #283D7F | 10.17:1 | AAA | Lc -97.4 | Preferred for body text |
| Black text on #283D7F | 2.06:1 | Fails | Lc 10.6 | Not readable |
| #283D7F text on white | 10.17:1 | AAA | Lc 93.3 | Preferred for body text |
| #283D7F text on black | 2.06:1 | Fails | Lc -9.2 | 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
#E2EAFB
oklch(93.6% 0.025 265.6)
-
Step 200
200
#CBD9FA
oklch(88.5% 0.048 267.2)
-
Step 300
300
#A8BFF9
oklch(80.8% 0.086 267.7)
-
Step 400
400
#7B9CF6
oklch(70.7% 0.137 267.6)
-
Step 500
500
#5B80F2
oklch(63% 0.175 267.6)
-
Step 600
600
#4367E1
oklch(55.7% 0.19 267.4)
-
Step 700
700
#3554C4
oklch(49.1% 0.178 267.5)
-
Step 800
800
#2C469E
oklch(42.7% 0.146 267.4)
-
Step 900
900 (this color)
#283D7F
oklch(38.2% 0.115 267.5)
-
Step 950
950
#17244A
oklch(27.2% 0.073 267.3)
#283D7F 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) | #184581 | 0.025 |
| Deuteranopia (no green cones) | #003D7E | 0.030 |
| Tritanopia (no blue cones) | #004C58 | 0.094 |
| Achromatopsia (no color) | #414141 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283D7F
#283D7F
oklch(38.2% 0.115 267.5)
- #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 #283D7F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight Blue #0A437A ΔE 0.029
- Cobalt #1E488F ΔE 0.038
- Dark Slate Blue #483D8B ΔE 0.052
- Marine Blue #01386A ΔE 0.052
- Light Navy #155084 ΔE 0.054
- Blueberry #464196 ΔE 0.060
- Dusk Blue #26538D ΔE 0.064
- Deep Sea Blue #015482 ΔE 0.067
Use #283D7F 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.