#1B153F
Closest named color: Dark Indigo (#1F0954). oklch(23.1% 0.077 285.2), rgb(27, 21, 63).
Aa
White text reads best on this color (17.13:1).
About this color
#1B153F is a very dark, moderately saturated purple. In OKLCH its lightness is 23%, its chroma 0.077 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.045 away. White text reads best on it, at 17.13:1.
| Hue family | Purples |
| Lightness | very dark (23%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.22:1 |
| White text | 17.13:1 |
Values
| HEX | #1B153F |
| RGB | rgb(27, 21, 63) |
| HSL | hsl(249, 50%, 16%) |
| OKLCH | oklch(23.1% 0.077 285.2) |
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 #1B153F | 17.13:1 | AAA | Lc -106.2 | Preferred for body text |
| Black text on #1B153F | 1.22:1 | Fails | Lc 0.0 | Not readable |
| #1B153F text on white | 17.13:1 | AAA | Lc 103.8 | Preferred for body text |
| #1B153F 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
#F4F4FE
oklch(97% 0.013 286.1)
-
Step 100
100
#E8E8FB
oklch(93.7% 0.026 285.9)
-
Step 200
200
#D5D5FA
oklch(88.5% 0.051 285.3)
-
Step 300
300
#BAB9FA
oklch(81% 0.091 284.9)
-
Step 400
400
#9891F7
oklch(70.6% 0.147 285.1)
-
Step 500
500
#8272F3
oklch(63% 0.186 285.4)
-
Step 600
600
#6D57E2
oklch(55.7% 0.202 285)
-
Step 700
700
#5C45C4
oklch(49% 0.188 285.4)
-
Step 800
800
#4B3A9F
oklch(42.7% 0.156 285.4)
-
Step 900
900
#3E337E
oklch(37.7% 0.122 285.6)
-
Step 950
950 (this color)
#1B153F
oklch(23.1% 0.077 285.2)
#1B153F 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) | #001D40 | 0.040 |
| Deuteranopia (no green cones) | #001A3E | 0.039 |
| Tritanopia (no blue cones) | #0E1F27 | 0.065 |
| Achromatopsia (no color) | #1B1B1B | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B153F
#1B153F
oklch(23.1% 0.077 285.2)
- #211E00
#211E00
oklch(23.1% 0.049 104.3)
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 #1B153F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.045
- Navy Blue #001146 ΔE 0.048
- Rich Black #0D1B2A ΔE 0.053
- Midnight Purple #280137 ΔE 0.055
- Oxford Blue #1B263B ΔE 0.056
- Very Dark Purple #2A0134 ΔE 0.059
- Dark #1B2431 ΔE 0.060
- Dark Purple #35063E ΔE 0.063
Use #1B153F 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.