#1B172F
Closest named color: Rich Black (#0D1B2A). oklch(22.3% 0.046 289.8), rgb(27, 23, 47).
Aa
White text reads best on this color (17.35:1).
About this color
#1B172F is a very dark, muted purple. In OKLCH its lightness is 22%, its chroma 0.046 and its hue 290°. Its hue sits on the cool side of the wheel. The nearest named color is Rich Black (#0D1B2A), ΔE 0.029 away. White text reads best on it, at 17.35:1.
| Hue family | Purples |
| Lightness | very dark (22%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Rich Black (#0D1B2A) |
| Black text | 1.21:1 |
| White text | 17.35:1 |
Values
| HEX | #1B172F |
| RGB | rgb(27, 23, 47) |
| HSL | hsl(250, 34%, 14%) |
| OKLCH | oklch(22.3% 0.046 289.8) |
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 #1B172F | 17.35:1 | AAA | Lc -106.5 | Preferred for body text |
| Black text on #1B172F | 1.21:1 | Fails | Lc 0.0 | Not readable |
| #1B172F text on white | 17.35:1 | AAA | Lc 104.2 | Preferred for body text |
| #1B172F 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
#F5F5FA
oklch(97.2% 0.007 286.3)
-
Step 100
100
#E9E8F4
oklch(93.5% 0.016 289.9)
-
Step 200
200
#D8D6EC
oklch(88.4% 0.03 289.9)
-
Step 300
300
#BFBBE2
oklch(80.8% 0.055 289.8)
-
Step 400
400
#9F98D4
oklch(70.8% 0.087 289.3)
-
Step 500
500
#887DC8
oklch(63% 0.111 289.5)
-
Step 600
600
#7365B5
oklch(55.6% 0.122 289.9)
-
Step 700
700
#60549C
oklch(49.2% 0.113 289.2)
-
Step 800
800
#4F457E
oklch(42.8% 0.093 290)
-
Step 900
900
#413A65
oklch(37.6% 0.072 289.9)
-
Step 950
950 (this color)
#1B172F
oklch(22.3% 0.046 289.8)
#1B172F 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) | #0F1B30 | 0.023 |
| Deuteranopia (no green cones) | #0F1A2E | 0.022 |
| Tritanopia (no blue cones) | #161C20 | 0.040 |
| Achromatopsia (no color) | #1A1A1A | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #1B172F
#1B172F
oklch(22.3% 0.046 289.8)
- #1D1D01
#1D1D01
oklch(22.4% 0.047 109.7)
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 #1B172F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rich Black #0D1B2A ΔE 0.029
- Dark #1B2431 ΔE 0.044
- Oxford Blue #1B263B ΔE 0.051
- Jet #212529 ΔE 0.056
- Midnight Purple #280137 ΔE 0.063
- Very Dark Purple #2A0134 ΔE 0.064
- Navy Blue #001146 ΔE 0.066
- Rich Navy #001219 ΔE 0.070
Use #1B172F 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.