#1B1545
Closest named color: Dark Indigo (#1F0954). oklch(23.7% 0.086 283.3), rgb(27, 21, 69).
Aa
White text reads best on this color (16.93:1).
About this color
#1B1545 is a very dark, moderately saturated purple. In OKLCH its lightness is 24%, its chroma 0.086 and its hue 283°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.036 away. White text reads best on it, at 16.93:1.
| Hue family | Purples |
| Lightness | very dark (24%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.23:1 |
| White text | 16.93:1 |
Values
| HEX | #1B1545 |
| RGB | rgb(27, 21, 69) |
| HSL | hsl(248, 53%, 18%) |
| OKLCH | oklch(23.7% 0.086 283.3) |
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 #1B1545 | 16.93:1 | AAA | Lc -106.0 | Preferred for body text |
| Black text on #1B1545 | 1.23:1 | Fails | Lc 0.0 | Not readable |
| #1B1545 text on white | 16.93:1 | AAA | Lc 103.6 | Preferred for body text |
| #1B1545 text on black | 1.23:1 | 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
#F4F4FF
oklch(97% 0.015 286.1)
-
Step 100
100
#E7E8FE
oklch(93.7% 0.03 283.7)
-
Step 200
200
#D3D5FE
oklch(88.5% 0.056 283)
-
Step 300
300
#B7B9FF
oklch(80.9% 0.098 282.7)
-
Step 400
400
#9591FF
oklch(70.8% 0.158 283.2)
-
Step 500
500
#7E70FF
oklch(63.2% 0.205 283.3)
-
Step 600
600
#6A51F0
oklch(55.6% 0.227 283.4)
-
Step 700
700
#5940D1
oklch(49.1% 0.211 283.3)
-
Step 800
800
#4836A9
oklch(42.7% 0.175 283.2)
-
Step 900
900
#3B3186
oklch(37.7% 0.137 283)
-
Step 950
950 (this color)
#1B1545
oklch(23.7% 0.086 283.3)
#1B1545 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) | #001E47 | 0.040 |
| Deuteranopia (no green cones) | #001B44 | 0.038 |
| Tritanopia (no blue cones) | #08212A | 0.074 |
| Achromatopsia (no color) | #1D1D1D | 0.087 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B1545
#1B1545
oklch(23.7% 0.086 283.3)
- #231F00
#231F00
oklch(23.6% 0.05 102.5)
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 #1B1545, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.036
- Navy Blue #001146 ΔE 0.046
- Midnight Purple #280137 ΔE 0.059
- Oxford Blue #1B263B ΔE 0.059
- Rich Black #0D1B2A ΔE 0.062
- Night Blue #040348 ΔE 0.063
- Very Dark Purple #2A0134 ΔE 0.064
- Dark Purple #35063E ΔE 0.064
Use #1B1545 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.