#1B153D
Closest named color: Dark Indigo (#1F0954). oklch(22.9% 0.074 285.9), rgb(27, 21, 61).
Aa
White text reads best on this color (17.19:1).
About this color
#1B153D is a very dark, moderately saturated purple. In OKLCH its lightness is 23%, its chroma 0.074 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.049 away. White text reads best on it, at 17.19:1.
| Hue family | Purples |
| Lightness | very dark (23%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.22:1 |
| White text | 17.19:1 |
Values
| HEX | #1B153D |
| RGB | rgb(27, 21, 61) |
| HSL | hsl(249, 49%, 16%) |
| OKLCH | oklch(22.9% 0.074 285.9) |
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 #1B153D | 17.19:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #1B153D | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #1B153D text on white | 17.19:1 | AAA | Lc 103.9 | Preferred for body text |
| #1B153D text on black | 1.22:1 | 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
#F4F4FD
oklch(97% 0.012 286.2)
-
Step 100
100
#E8E8FB
oklch(93.7% 0.026 285.9)
-
Step 200
200
#D6D5F9
oklch(88.5% 0.049 286.6)
-
Step 300
300
#BBB9F7
oklch(80.9% 0.087 285.8)
-
Step 400
400
#9A92F3
oklch(70.7% 0.139 286)
-
Step 500
500
#8373EF
oklch(63% 0.18 285.9)
-
Step 600
600
#6E58DD
oklch(55.5% 0.194 285.8)
-
Step 700
700
#5D47C0
oklch(49.1% 0.181 286)
-
Step 800
800
#4B3B9B
oklch(42.6% 0.15 285.8)
-
Step 900
900
#3E347B
oklch(37.6% 0.116 285.8)
-
Step 950
950 (this color)
#1B153D
oklch(22.9% 0.074 285.9)
#1B153D 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) | #001C3E | 0.040 |
| Deuteranopia (no green cones) | #001A3C | 0.040 |
| Tritanopia (no blue cones) | #0F1E26 | 0.062 |
| Achromatopsia (no color) | #1B1B1B | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B153D
#1B153D
oklch(22.9% 0.074 285.9)
- #201E00
#201E00
oklch(23% 0.049 106.1)
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 #1B153D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.049
- Navy Blue #001146 ΔE 0.049
- Rich Black #0D1B2A ΔE 0.050
- Midnight Purple #280137 ΔE 0.054
- Oxford Blue #1B263B ΔE 0.055
- Very Dark Purple #2A0134 ΔE 0.058
- Dark #1B2431 ΔE 0.058
- Dark Purple #35063E ΔE 0.063
Use #1B153D 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.