#1B153B
Closest named color: Rich Black (#0D1B2A). oklch(22.8% 0.07 286.6), rgb(27, 21, 59).
Aa
White text reads best on this color (17.25:1).
About this color
#1B153B is a very dark, moderately saturated purple. In OKLCH its lightness is 23%, its chroma 0.070 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.047 away. White text reads best on it, at 17.25:1.
| Hue family | Purples |
| Lightness | very dark (23%) |
| Chroma | moderately saturated (0.070) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.21:1 |
| White text | 17.25:1 |
Values
| HEX | #1B153B |
| RGB | rgb(27, 21, 59) |
| HSL | hsl(249, 48%, 16%) |
| OKLCH | oklch(22.8% 0.07 286.6) |
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 #1B153B | 17.25:1 | AAA | Lc -106.3 | Preferred for body text |
| Black text on #1B153B | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #1B153B text on white | 17.25:1 | AAA | Lc 104.0 | Preferred for body text |
| #1B153B text on black | 1.21:1 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E8E8FA
oklch(93.6% 0.024 285.9)
-
Step 200
200
#D6D5F7
oklch(88.4% 0.047 286.8)
-
Step 300
300
#BCB9F5
oklch(80.9% 0.084 286.6)
-
Step 400
400
#9B93EF
oklch(70.8% 0.132 286.5)
-
Step 500
500
#8475EA
oklch(63.2% 0.17 286.3)
-
Step 600
600
#705AD8
oklch(55.7% 0.185 286.8)
-
Step 700
700
#5E49BB
oklch(49.1% 0.172 286.7)
-
Step 800
800
#4C3D98
oklch(42.8% 0.143 286.2)
-
Step 900
900
#3F3579
oklch(37.8% 0.112 286.5)
-
Step 950
950 (this color)
#1B153B
oklch(22.8% 0.07 286.6)
#1B153B 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) | #021C3C | 0.038 |
| Deuteranopia (no green cones) | #021A3A | 0.038 |
| Tritanopia (no blue cones) | #101D25 | 0.058 |
| Achromatopsia (no color) | #1B1B1B | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B153B
#1B153B
oklch(22.8% 0.07 286.6)
- #1F1E00
#1F1E00
oklch(22.9% 0.049 108)
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 #1B153B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.047
- Navy Blue #001146 ΔE 0.051
- Dark Indigo #1F0954 ΔE 0.052
- Midnight Purple #280137 ΔE 0.054
- Oxford Blue #1B263B ΔE 0.055
- Dark #1B2431 ΔE 0.057
- Very Dark Purple #2A0134 ΔE 0.057
- Dark Purple #35063E ΔE 0.063
Use #1B153B 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.