#283F7F
Closest named color: Twilight Blue (#0A437A). oklch(38.6% 0.112 266.4), rgb(40, 63, 127).
Aa
White text reads best on this color (9.96:1).
About this color
#283F7F is a dark, moderately saturated blue. In OKLCH its lightness is 39%, its chroma 0.112 and its hue 266°. 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 9.96:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Twilight Blue (#0A437A) |
| Black text | 2.10:1 |
| White text | 9.96:1 |
Values
| HEX | #283F7F |
| RGB | rgb(40, 63, 127) |
| HSL | hsl(224, 52%, 33%) |
| OKLCH | oklch(38.6% 0.112 266.4) |
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 #283F7F | 9.96:1 | AAA | Lc -97.0 | Preferred for body text |
| Black text on #283F7F | 2.10:1 | Fails | Lc 11.1 | Not readable |
| #283F7F text on white | 9.96:1 | AAA | Lc 92.8 | Preferred for body text |
| #283F7F text on black | 2.10:1 | Fails | Lc -9.6 | 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
#CBD9F9
oklch(88.5% 0.047 266.7)
-
Step 300
300
#A8C0F8
oklch(81% 0.084 266.5)
-
Step 400
400
#7A9DF4
oklch(70.7% 0.134 266.4)
-
Step 500
500
#5982F0
oklch(63.2% 0.171 266.2)
-
Step 600
600
#4068DF
oklch(55.6% 0.187 266.3)
-
Step 700
700
#3356C1
oklch(49.1% 0.173 266.3)
-
Step 800
800
#2A479C
oklch(42.7% 0.143 266.2)
-
Step 900
900 (this color)
#283F7F
oklch(38.6% 0.112 266.4)
-
Step 950
950
#162449
oklch(27% 0.071 266.2)
#283F7F 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) | #1D4781 | 0.023 |
| Deuteranopia (no green cones) | #073F7E | 0.026 |
| Tritanopia (no blue cones) | #004E59 | 0.092 |
| Achromatopsia (no color) | #434343 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283F7F
#283F7F
oklch(38.6% 0.112 266.4)
- #564000
#564000
oklch(38.5% 0.079 86.5)
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 #283F7F, 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 0.034
- Light Navy #155084 ΔE 0.049
- Dark Slate Blue #483D8B ΔE 0.051
- Marine Blue #01386A ΔE 0.054
- Blueberry #464196 ΔE 0.058
- Dusk Blue #26538D ΔE 0.059
- Deep Sea Blue #015482 ΔE 0.062
Use #283F7F 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.