#1B103E
Closest named color: Dark Indigo (#1F0954). oklch(22% 0.083 288.6), rgb(27, 16, 62).
Aa
White text reads best on this color (17.64:1).
About this color
#1B103E is a very dark, moderately saturated purple. In OKLCH its lightness is 22%, its chroma 0.083 and its hue 289°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Indigo (#1F0954), ΔE 0.043 away. White text reads best on it, at 17.64:1.
| Hue family | Purples |
| Lightness | very dark (22%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Dark Indigo (#1F0954) |
| Black text | 1.19:1 |
| White text | 17.64:1 |
Values
| HEX | #1B103E |
| RGB | rgb(27, 16, 62) |
| HSL | hsl(254, 59%, 15%) |
| OKLCH | oklch(22% 0.083 288.6) |
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 #1B103E | 17.64:1 | AAA | Lc -106.5 | Preferred for body text |
| Black text on #1B103E | 1.19:1 | Fails | Lc 0.0 | Not readable |
| #1B103E text on white | 17.64:1 | AAA | Lc 104.2 | Preferred for body text |
| #1B103E text on black | 1.19:1 | 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
#F5F4FE
oklch(97.1% 0.013 290.8)
-
Step 100
100
#E9E7FC
oklch(93.6% 0.028 290.2)
-
Step 200
200
#D7D4FC
oklch(88.5% 0.055 288.7)
-
Step 300
300
#BEB7FD
oklch(81% 0.098 288.6)
-
Step 400
400
#9E8DFC
oklch(70.6% 0.159 288.7)
-
Step 500
500
#896CF9
oklch(63% 0.202 288.7)
-
Step 600
600
#754FE8
oklch(55.6% 0.218 288.6)
-
Step 700
700
#633ECA
oklch(49.1% 0.204 288.7)
-
Step 800
800
#5034A3
oklch(42.6% 0.169 288.7)
-
Step 900
900
#423082
oklch(37.8% 0.132 288.6)
-
Step 950
950 (this color)
#1B103E
oklch(22% 0.083 288.6)
#1B103E 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) | #001A3F | 0.045 |
| Deuteranopia (no green cones) | #00173D | 0.043 |
| Tritanopia (no blue cones) | #0F1B25 | 0.067 |
| Achromatopsia (no color) | #191919 | 0.084 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B103E
#1B103E
oklch(22% 0.083 288.6)
- #1D1C00
#1D1C00
oklch(22% 0.047 107.9)
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 #1B103E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Indigo #1F0954 ΔE 0.043
- Midnight Purple #280137 ΔE 0.045
- Navy Blue #001146 ΔE 0.047
- Very Dark Purple #2A0134 ΔE 0.051
- Night Blue #040348 ΔE 0.059
- Rich Black #0D1B2A ΔE 0.059
- Dark Purple #35063E ΔE 0.061
- Deep Purple #36013F ΔE 0.066
Use #1B103E 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.