#1B1947
Closest named color: Dark Indigo (#1F0954). oklch(24.7% 0.083 280.3), rgb(27, 25, 71).
Aa
White text reads best on this color (16.44:1).
About this color
#1B1947 is a very dark, moderately saturated purple. In OKLCH its lightness is 25%, its chroma 0.083 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.040 away. White text reads best on it, at 16.44:1.
| Hue family | Purples |
| Lightness | very dark (25%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.27:1 |
| White text | 16.44:1 |
Values
| HEX | #1B1947 |
| RGB | rgb(27, 25, 71) |
| HSL | hsl(243, 48%, 19%) |
| OKLCH | oklch(24.7% 0.083 280.3) |
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 #1B1947 | 16.44:1 | AAA | Lc -105.7 | Preferred for body text |
| Black text on #1B1947 | 1.27:1 | Fails | Lc 0.0 | Not readable |
| #1B1947 text on white | 16.44:1 | AAA | Lc 103.2 | Preferred for body text |
| #1B1947 text on black | 1.27:1 | Fails | Lc 0.0 | 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 950.
-
Step 50
50
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E6E8FD
oklch(93.6% 0.028 281.5)
-
Step 200
200
#D1D6FE
oklch(88.5% 0.055 279.6)
-
Step 300
300
#B4BAFF
oklch(80.9% 0.098 280.1)
-
Step 400
400
#8F93FF
oklch(70.7% 0.156 280)
-
Step 500
500
#7773FF
oklch(63.2% 0.202 280.2)
-
Step 600
600
#6356EE
oklch(55.7% 0.219 280.4)
-
Step 700
700
#5244CF
oklch(49% 0.205 280.2)
-
Step 800
800
#433AA7
oklch(42.7% 0.168 280.3)
-
Step 900
900
#383384
oklch(37.6% 0.131 280.8)
-
Step 950
950 (this color)
#1B1947
oklch(24.7% 0.083 280.3)
#1B1947 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) | #002149 | 0.037 |
| Deuteranopia (no green cones) | #001D46 | 0.035 |
| Tritanopia (no blue cones) | #06242D | 0.072 |
| Achromatopsia (no color) | #1F1F1F | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B1947
#1B1947
oklch(24.7% 0.083 280.3)
- #272100
#272100
oklch(24.7% 0.051 99.3)
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 #1B1947, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.040
- Navy Blue #001146 ΔE 0.050
- Oxford Blue #1B263B ΔE 0.050
- Dark #1B2431 ΔE 0.060
- Rich Black #0D1B2A ΔE 0.062
- Midnight Purple #280137 ΔE 0.068
- Dark Purple #35063E ΔE 0.068
- Night Blue #040348 ΔE 0.070
Use #1B1947 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.